US20100183297A1 - Optical fiber sensor having electrical connectors - Google Patents
Optical fiber sensor having electrical connectors Download PDFInfo
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- US20100183297A1 US20100183297A1 US12/452,706 US45270608A US2010183297A1 US 20100183297 A1 US20100183297 A1 US 20100183297A1 US 45270608 A US45270608 A US 45270608A US 2010183297 A1 US2010183297 A1 US 2010183297A1
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- sensor
- ribbon
- optical
- fiber
- transmitter unit
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4292—Coupling light guides with opto-electronic elements the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/0233—Special features of optical sensors or probes classified in A61B5/00
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/04—Arrangements of multiple sensors of the same type
- A61B2562/043—Arrangements of multiple sensors of the same type in a linear array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3025—Electromagnetic shielding
Definitions
- An optical fiber sensor may have at least one optical sensor fiber which is equipped at its ends with an optical transmitter unit for feeding in a measurement signal, and with an optical receiver unit for registering this measurement signal, wherein the transmitter unit and the receiver unit also have electrical connections.
- the transmitter unit and receiver unit are physically separated from one another, that is to say they are each autonomous units.
- a fiber sensor of the type mentioned initially is described in U.S. Pat. No. 6,940,062 B2.
- This optical fiber sensor may, for example, be used to determine deformation, when the optical fiber sensor is applied in such a manner that the deformation of a component to which the optical fiber sensor is fitted causes bending of the optical sensor fiber of the optical fiber sensor. This can be verified by the influence of the bending on the optical attenuation behavior of the sensor fiber.
- a measurement signal is fed into the optical sensor fiber from an optical transmitter unit, and the measurement signal is evaluated by a receiver unit at the other end of the optical sensor fiber.
- the light intensity of the received measurement signal can be used to deduce the bending state of the sensor fiber.
- the optical transmitter unit and the optical receiver unit can each be supplied with power and the measurement variable can be read electrically, via plug contacts.
- the design of the fiber sensor according to U.S. Pat. No. 6,940,062 B2 may cause problems in certain applications.
- EP 968 400 B1 an application for an optical fiber sensor is described in which the movements of the human body are intended to be monitored.
- the optical fiber sensor is attached to the human body.
- electrical connections and the connecting lines fitted at both ends of the sensor fiber restrict the freedom of movement of the subject, thus limiting the validity of the measurement results that are determined.
- EP 968 400 B1 therefore proposes that the transmitter unit and the receiver unit be combined in one housing. This results in the capability to provide the optical fiber sensor with the electrical contact at only one end.
- the optical fiber sensors are laid in loops in the sensor ribbon, such that the start and the end of the respective sensor fiber are located at one end of the sensor ribbon. In this case, it is assumed that this measure results in the cross section of the sensor ribbon itself being twice as great than would be the case if the sensor fiber were to extend from one end of the sensor ribbon to the other end of the sensor ribbon. This is because the loss of wearing comfort associated with this outweighs the cumbersome contact being made at both ends.
- One potential object is to specify an optical fiber sensor whose wearing comfort and operating comfort are comparatively high.
- the inventors propose a fiber sensor specified initially, in that at least one electrical line is routed in the fiber sensor, parallel to the optical sensor fiber and connects at least some of the electrical connections of the receiver unit to at least some of the connections of the transmitter unit.
- an electrical line should in general be understood to be an arrangement for carrying electrical signals or supply currents.
- the electrical line may have one or more cores, that is to say that a plurality of electrical signals and supply currents are transported in one line.
- the provision of the electrical line running parallel to the sensor fiber means that it is possible on the one hand to dispense with all the optical sensor fibers being fed back to a single housing, and with units which are physically independent of one another being used for transmission and reception of the measurement signals (transmitter unit and receiver unit) at both ends of the sensor fiber.
- complex contact with the two units can be simplified by laying one electrical line between the transmitter unit and the receiver unit, by which contacts which are intended for the one unit can be laid to contacts of the other unit.
- the transmitter unit or the receiver unit it is particularly advantageous for the transmitter unit or the receiver unit to have exclusively electrical connections, which are connected via the electrical line. At least one of the units is therefore advantageously completely free of external electrical connections, which means that this unit need not make contact with any external electrical connecting lines.
- all the electrical contact lines which are required for operation of the relevant unit run via the electrical line which runs parallel to the optical sensor fiber. This considerably improves the wearing comfort, because an electrical contact is required with only one of the units (transmitter unit or receiver unit).
- the wearing comfort of the sensor fiber which, for example, may be integrated in a sensor ribbon, is also only insignificantly adversely affected by the additional presence of a further electrical line.
- This electrical line may have signal lines for a plurality of optical sensor fibers, since the cross section which is required for this purpose is less than that required for the optical sensor lines.
- the transmitter unit and the receiver unit have exclusively electrical connections which are connected via the electrical line.
- This refinement depends on the optical fiber sensor operating autonomously. This means that the fiber sensor must on the one hand have a power source for operation, while on the other hand a wireless interface must be available for reading the measurement data, or it must have a memory for this data in order that this data can be evaluated once the measurement has been completed. In this case, an electrical contact which advantageously need not be connected during the measurement can be provided for reading purposes.
- the laying of an electrical line parallel to the optical sensor fiber has the advantage that the components which are required for autonomous operation of the fiber sensor need be provided only once in each case.
- the transmitter unit can conceal the electrical voltage source, and the receiver unit can also be supplied electrically via the electrical line. If the memory module for the measured values and a wireless interface for transmitting them are also intended to be provided in the transmitter unit (for example in order to keep the receiver unit as small as possible), signal lines would also have to be laid between the receiver unit and the transmitter unit.
- the at least one optical sensor fiber to be integrated, in particular embedded, in a sensor ribbon.
- Embedding in a sensor ribbon advantageously allows simple handling of the optical fiber sensor.
- the sensor ribbon provides a certain amount of protection for the sensitive optical sensor fibers.
- a plurality of sensor fibers can be combined in a defined position with respect to one another in the sensor ribbon.
- the electrical line When using a sensor ribbon, it is advantageous for the electrical line to be in the form of a line conductor, and likewise to be integrated, in particular embedded, in the sensor ribbon.
- the sensor ribbon can then advantageously be laid easily, in order to carry out a measurement in the desired application. In this case, there is no need to pay particular attention to the optical or electrical sections.
- the complete sensor ribbon may then in particular have a standard physical height which, in the area of the electrical line, also corresponds to the physical height of the area in which there are preferably a plurality of sensor fibers.
- the electrical line is in the form of a ribbon conductor.
- a ribbon conductor advantageously has a very small physical height, thus allowing it to be routed easily parallel to the sensor fiber without significantly increasing the physical space occupied by the sensor ribbon.
- the ribbon conductor and the sensor ribbon are arranged side-by-side. This means that the ribbons are each located with the broad face of the ribbon adjacent to one another, that is to say, not edge-to-edge, but rather one above the other.
- the large joint surface area which is available thereby advantageously allows a fixed assembly to be produced.
- the ribbon conductor can in this case mechanically support the sensor fibers.
- the ribbon conductor and the sensor ribbon for example may be connected to one another by an adhesive layer. From the manufacturing point of view, this can be carried out particularly easily, in particular for small batches.
- the adhesive layer may be applied to one of the ribbons. However, it is also possible to use a double-sided adhesive tape.
- the electrical line is in the form of a ribbon conductor, by conductive paths being produced directly on the sensor ribbon.
- photomechanical methods may be used, in which, after suitable structuring of the ribbon surface, the conductive paths are produced by etching.
- Another option is to produce the conductive paths on the sensor ribbon by coating, using templates. In any case, a particularly space-saving solution is achieved by direct production of the conductive paths on the sensor ribbon.
- the assembly comprising the sensor ribbon and the ribbon conductor is sheathed with a sheath.
- This sheath provides additional protection for the entire assembly, and in particular when the conductive paths are produced directly on the sensor ribbon, the sheath additionally provides electrical insulation, which advantageously extends the options for use of the fiber sensor that is produced.
- FIG. 1 shows one exemplary embodiment of the proposed optical fiber sensor, schematically in the form of a longitudinal section
- FIG. 2 shows a plan view of one exemplary embodiment of the proposed fiber sensor, which is mounted on a carrier ribbon, and
- FIGS. 3 to 5 show cross sections through the sensor ribbons for different exemplary embodiments of the fiber sensor.
- An optical fiber sensor 11 as shown in FIG. 1 comprises three units: an optical transmitter unit 12 , a sensor ribbon 13 and an optical receiver unit 14 .
- the sensor unit 12 is fitted to one end of the sensor ribbon, and the receiver unit 14 , which is physically separated from the transmitter unit, is fitted to the other end of the sensor ribbon 13 .
- the sensor ribbon has a plurality of optical sensor fibers 15 which each have sections 16 that are sensitive to bending, at different points on the sensor ribbon. This allows bending of the sensor ribbon 13 to be determined with position resolution. Furthermore, an electrical line which is in the form of a line conductor 17 runs parallel to the sensor fibers. Optical contact is made with the sensor fibers 15 in the receiver unit 14 and in the transmitter unit 12 via optical interfaces 18 . Furthermore, the transmitter unit 12 and the receiver unit 14 have electrical connections 19 e and 19 s, via which contact can be made with the line conductor. These are illustrated only schematically in FIG. 1 . If the line conductor has a plurality of cores, then a plurality of connections 19 e, 19 s are, of course, also necessary, although these have been omitted in FIG. 1 , for the sake of better clarity.
- the transmitter unit 12 and the receiver unit 13 each comprise printed circuit boards 20 on which a protective cap 21 is provided.
- the protective cap acts as a housing for the respective driver electronics, a voltage supply and a radio module for passing on the measured values without the use of cables, and for reception of control signals for the optical fiber sensor.
- these components are not illustrated in any more detail.
- the fiber sensor illustrated in FIG. 2 has the following differences in comparison to FIG. 1 .
- the electrical conductor in the form of a line conductor and not illustrated
- the line conductor 17 runs parallel alongside the sensor ribbon 13 .
- the transmitter unit 12 and the receiver unit 14 are also each completely integrated in a housing.
- the transmitter unit 12 additionally has electrical connections, which are not illustrated in any more detail but which can make contact with a plug 22 . This allows a supply and signal line 23 to be connected to the transmitter unit 12 .
- the electrical supply to the receiver unit 14 and the transmission of signals between the transmitter unit 12 and the receiver unit 14 take place via the line conductor which is not illustrated (cf., analogously, 17 in FIG. 1 ), which means that there is no need for any external contact with the receiver unit 14 .
- the optical fiber sensor as shown in FIG. 2 can be mounted on a carrier ribbon 24 .
- This comprises a flexible substrate 25 which, for example, can be firmly adhesively bonded to the skin of a subject when the fiber sensor is used as a back sensor.
- An adhesive which is compatible with skin is used in this case.
- the flexibility of the substrate ensures a high level of wearing comfort, since the carrier ribbon can follow the movements of the spinal column and the elastic changes to the skin associated with this.
- An elastic cover layer 26 is also applied to the substrate 25 so as to create a pocket which is open on one side. The fiber sensor can be pushed into this pocket, with its contour 27 being visible under the elastic cover layer.
- the receiver unit 14 is located at the end of the pocket.
- the transmitter unit 12 is mounted on a rigid fixing plate 28 , thus providing a reference point on the carrier ribbon 24 for the fiber sensor.
- FIG. 3 shows a cross section through the sensor ribbon 13 , as could be used by way of example for the fiber sensor shown in FIG. 2 .
- the line conductors 17 two of which are provided, are arranged on the two edges 29 and therefore enclose the sensor fiber 15 between them. This has the advantage that the sensor fibers 15 , which are more sensitive than the line conductors 17 , are protected.
- the line conductors 17 and the sensor fibers 15 are jointly embedded in the material of the sensor ribbon 13 , and this can be done, for example, by encapsulation in a silicone rubber, which ensures a high degree of flexibility of the resultant sensor ribbon 13 .
- FIG. 4 shows another possible form of the sensor ribbon 13 .
- This has exclusively sensor fibers 15 which can be encapsulated in the manner described in relation to FIG. 3 .
- an adhesive layer 30 is applied to the lower face of the sensor ribbon 13 , and connects the sensor ribbon 13 to an electrical ribbon conductor 31 .
- the ribbon conductor 31 has a substrate 32 on which conductive paths 33 have been produced, for example by structuring by etching.
- the entire assembly comprising the sensor ribbon 13 and the ribbon conductor 31 is additionally provided with an elastic sheath 34 , for example composed of rubber.
- the conductive paths 33 are produced directly on the sensor ribbon 13 . This can be done, for example, by coating using the CVD method.
- the functionality of the ribbon conductor 33 as shown in FIG. 4 is therefore at the same time integrated in the sensor ribbon 13 .
- This assembly is also provided with a sheath 34 , corresponding to the embodiment shown in FIG. 4 .
Abstract
An optical fiber sensor has a sensor band of optical sensor fibers. The band is connected on both ends to a transmitter unit and a receiver unit, the transmitter unit feeding optical signals into the optical fibers, the signals being optically evaluated with regard to the intensity thereof by the receiver unit. Parallel electrical conductors are located in the sensor band and can, for example, be designed as ribbon cables. The electrical conductors allow an additional electrical connection of the transmitter unit and the receiver unit, so that external cables advantageously need only be connected to one of the two units. The difficulty of connection is thereby reduced, and the wearing comfort is increased for the application of the fiber sensor, for example, as a back sensor.
Description
- This application is based on and hereby claims priority to PCT Application No. PCT/EP2008/059254 filed on Jul. 15, 2008, DE Application No. 10 2007 046 385.7 filed on Sep. 21, 2007 and DE Application No. 10 2007 034 264.2 filed on Jul. 18, 2007, the contents of which are hereby incorporated by reference.
- An optical fiber sensor may have at least one optical sensor fiber which is equipped at its ends with an optical transmitter unit for feeding in a measurement signal, and with an optical receiver unit for registering this measurement signal, wherein the transmitter unit and the receiver unit also have electrical connections. The transmitter unit and receiver unit are physically separated from one another, that is to say they are each autonomous units.
- By way of example, a fiber sensor of the type mentioned initially is described in U.S. Pat. No. 6,940,062 B2. This optical fiber sensor may, for example, be used to determine deformation, when the optical fiber sensor is applied in such a manner that the deformation of a component to which the optical fiber sensor is fitted causes bending of the optical sensor fiber of the optical fiber sensor. This can be verified by the influence of the bending on the optical attenuation behavior of the sensor fiber. For this purpose, a measurement signal is fed into the optical sensor fiber from an optical transmitter unit, and the measurement signal is evaluated by a receiver unit at the other end of the optical sensor fiber. The light intensity of the received measurement signal can be used to deduce the bending state of the sensor fiber. The optical transmitter unit and the optical receiver unit can each be supplied with power and the measurement variable can be read electrically, via plug contacts.
- However, the design of the fiber sensor according to U.S. Pat. No. 6,940,062 B2 may cause problems in certain applications. For example, according to EP 968 400 B1, an application for an optical fiber sensor is described in which the movements of the human body are intended to be monitored. For this purpose, the optical fiber sensor is attached to the human body. In this case, however, electrical connections and the connecting lines fitted at both ends of the sensor fiber restrict the freedom of movement of the subject, thus limiting the validity of the measurement results that are determined.
- EP 968 400 B1 therefore proposes that the transmitter unit and the receiver unit be combined in one housing. This results in the capability to provide the optical fiber sensor with the electrical contact at only one end. In order to allow the transmitter unit and the receiver unit to be joined together, the optical fiber sensors are laid in loops in the sensor ribbon, such that the start and the end of the respective sensor fiber are located at one end of the sensor ribbon. In this case, it is assumed that this measure results in the cross section of the sensor ribbon itself being twice as great than would be the case if the sensor fiber were to extend from one end of the sensor ribbon to the other end of the sensor ribbon. This is because the loss of wearing comfort associated with this outweighs the cumbersome contact being made at both ends.
- One potential object is to specify an optical fiber sensor whose wearing comfort and operating comfort are comparatively high.
- The inventors propose a fiber sensor specified initially, in that at least one electrical line is routed in the fiber sensor, parallel to the optical sensor fiber and connects at least some of the electrical connections of the receiver unit to at least some of the connections of the transmitter unit. For the purposes of the device proposed here, an electrical line should in general be understood to be an arrangement for carrying electrical signals or supply currents. In this case, the electrical line may have one or more cores, that is to say that a plurality of electrical signals and supply currents are transported in one line. The provision of the electrical line running parallel to the sensor fiber means that it is possible on the one hand to dispense with all the optical sensor fibers being fed back to a single housing, and with units which are physically independent of one another being used for transmission and reception of the measurement signals (transmitter unit and receiver unit) at both ends of the sensor fiber. However, complex contact with the two units can be simplified by laying one electrical line between the transmitter unit and the receiver unit, by which contacts which are intended for the one unit can be laid to contacts of the other unit.
- In this case, it is particularly advantageous for the transmitter unit or the receiver unit to have exclusively electrical connections, which are connected via the electrical line. At least one of the units is therefore advantageously completely free of external electrical connections, which means that this unit need not make contact with any external electrical connecting lines. In fact, all the electrical contact lines which are required for operation of the relevant unit run via the electrical line which runs parallel to the optical sensor fiber. This considerably improves the wearing comfort, because an electrical contact is required with only one of the units (transmitter unit or receiver unit). Furthermore, the wearing comfort of the sensor fiber, which, for example, may be integrated in a sensor ribbon, is also only insignificantly adversely affected by the additional presence of a further electrical line. This electrical line may have signal lines for a plurality of optical sensor fibers, since the cross section which is required for this purpose is less than that required for the optical sensor lines.
- One advantageous refinement is obtained if the transmitter unit and the receiver unit have exclusively electrical connections which are connected via the electrical line. This refinement depends on the optical fiber sensor operating autonomously. This means that the fiber sensor must on the one hand have a power source for operation, while on the other hand a wireless interface must be available for reading the measurement data, or it must have a memory for this data in order that this data can be evaluated once the measurement has been completed. In this case, an electrical contact which advantageously need not be connected during the measurement can be provided for reading purposes. In the case of an autonomously operating optical fiber sensor, the laying of an electrical line parallel to the optical sensor fiber has the advantage that the components which are required for autonomous operation of the fiber sensor need be provided only once in each case. For example, the transmitter unit can conceal the electrical voltage source, and the receiver unit can also be supplied electrically via the electrical line. If the memory module for the measured values and a wireless interface for transmitting them are also intended to be provided in the transmitter unit (for example in order to keep the receiver unit as small as possible), signal lines would also have to be laid between the receiver unit and the transmitter unit.
- One development of the idea provides for the at least one optical sensor fiber to be integrated, in particular embedded, in a sensor ribbon. Embedding in a sensor ribbon advantageously allows simple handling of the optical fiber sensor. On the one hand, the sensor ribbon provides a certain amount of protection for the sensitive optical sensor fibers. On the other hand, a plurality of sensor fibers can be combined in a defined position with respect to one another in the sensor ribbon.
- When using a sensor ribbon, it is advantageous for the electrical line to be in the form of a line conductor, and likewise to be integrated, in particular embedded, in the sensor ribbon. The sensor ribbon can then advantageously be laid easily, in order to carry out a measurement in the desired application. In this case, there is no need to pay particular attention to the optical or electrical sections. In this case, it is particularly advantageous for the electrical line to have essentially the same diameter as the at least one optical fiber. From the manufacturing point of view, this allows this to be laid easily together with the optical sensor fibers or the optical sensor fiber, and combined to form a sensor ribbon. The complete sensor ribbon may then in particular have a standard physical height which, in the area of the electrical line, also corresponds to the physical height of the area in which there are preferably a plurality of sensor fibers.
- Another advantageous option is for the electrical line to be in the form of a ribbon conductor. A ribbon conductor advantageously has a very small physical height, thus allowing it to be routed easily parallel to the sensor fiber without significantly increasing the physical space occupied by the sensor ribbon. In this case, it is particularly advantageous for the ribbon conductor and the sensor ribbon to be arranged side-by-side. This means that the ribbons are each located with the broad face of the ribbon adjacent to one another, that is to say, not edge-to-edge, but rather one above the other. The large joint surface area which is available thereby advantageously allows a fixed assembly to be produced. At the same time the ribbon conductor can in this case mechanically support the sensor fibers. The ribbon conductor and the sensor ribbon for example may be connected to one another by an adhesive layer. From the manufacturing point of view, this can be carried out particularly easily, in particular for small batches. The adhesive layer may be applied to one of the ribbons. However, it is also possible to use a double-sided adhesive tape.
- An alternative option is for the electrical line to be in the form of a ribbon conductor, by conductive paths being produced directly on the sensor ribbon. In this case, it is possible to use the normal methods for manufacturing electrical conductive paths. By way of example, photomechanical methods may be used, in which, after suitable structuring of the ribbon surface, the conductive paths are produced by etching. Another option is to produce the conductive paths on the sensor ribbon by coating, using templates. In any case, a particularly space-saving solution is achieved by direct production of the conductive paths on the sensor ribbon.
- It is also advantageous for the assembly comprising the sensor ribbon and the ribbon conductor to be sheathed with a sheath. This sheath provides additional protection for the entire assembly, and in particular when the conductive paths are produced directly on the sensor ribbon, the sheath additionally provides electrical insulation, which advantageously extends the options for use of the fiber sensor that is produced.
- These and other objects and advantages of the present invention will become more apparent and more readily appreciated from the following description of the preferred embodiments, taken in conjunction with the accompanying drawings of which:
-
FIG. 1 shows one exemplary embodiment of the proposed optical fiber sensor, schematically in the form of a longitudinal section, -
FIG. 2 shows a plan view of one exemplary embodiment of the proposed fiber sensor, which is mounted on a carrier ribbon, and -
FIGS. 3 to 5 show cross sections through the sensor ribbons for different exemplary embodiments of the fiber sensor. - Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
- An
optical fiber sensor 11 as shown inFIG. 1 comprises three units: anoptical transmitter unit 12, asensor ribbon 13 and anoptical receiver unit 14. Thesensor unit 12 is fitted to one end of the sensor ribbon, and thereceiver unit 14, which is physically separated from the transmitter unit, is fitted to the other end of thesensor ribbon 13. - The sensor ribbon has a plurality of
optical sensor fibers 15 which each havesections 16 that are sensitive to bending, at different points on the sensor ribbon. This allows bending of thesensor ribbon 13 to be determined with position resolution. Furthermore, an electrical line which is in the form of aline conductor 17 runs parallel to the sensor fibers. Optical contact is made with thesensor fibers 15 in thereceiver unit 14 and in thetransmitter unit 12 via optical interfaces 18. Furthermore, thetransmitter unit 12 and thereceiver unit 14 haveelectrical connections FIG. 1 . If the line conductor has a plurality of cores, then a plurality ofconnections FIG. 1 , for the sake of better clarity. - In the case of the solution for the optical fiber sensor as shown in
FIG. 1 , this represents an autonomous system. Thetransmitter unit 12 and thereceiver unit 13 each comprise printedcircuit boards 20 on which aprotective cap 21 is provided. The protective cap acts as a housing for the respective driver electronics, a voltage supply and a radio module for passing on the measured values without the use of cables, and for reception of control signals for the optical fiber sensor. However, these components are not illustrated in any more detail. - The fiber sensor illustrated in
FIG. 2 has the following differences in comparison toFIG. 1 . In contrast to thesensor ribbon 13 shown inFIG. 1 , in the case of thesensor ribbon 13 shown inFIG. 2 , the electrical conductor (in the form of a line conductor and not illustrated) is also embedded in thesensor ribbon 13. According toFIG. 1 , theline conductor 17 runs parallel alongside thesensor ribbon 13. Thetransmitter unit 12 and thereceiver unit 14 are also each completely integrated in a housing. Furthermore, thetransmitter unit 12 additionally has electrical connections, which are not illustrated in any more detail but which can make contact with aplug 22. This allows a supply andsignal line 23 to be connected to thetransmitter unit 12. The electrical supply to thereceiver unit 14 and the transmission of signals between thetransmitter unit 12 and thereceiver unit 14 take place via the line conductor which is not illustrated (cf., analogously, 17 inFIG. 1 ), which means that there is no need for any external contact with thereceiver unit 14. - Since the
receiver unit 14 has no external contacts, the optical fiber sensor as shown inFIG. 2 can be mounted on acarrier ribbon 24. This comprises aflexible substrate 25 which, for example, can be firmly adhesively bonded to the skin of a subject when the fiber sensor is used as a back sensor. An adhesive which is compatible with skin is used in this case. The flexibility of the substrate ensures a high level of wearing comfort, since the carrier ribbon can follow the movements of the spinal column and the elastic changes to the skin associated with this. Anelastic cover layer 26 is also applied to thesubstrate 25 so as to create a pocket which is open on one side. The fiber sensor can be pushed into this pocket, with itscontour 27 being visible under the elastic cover layer. In this case, thereceiver unit 14 is located at the end of the pocket. Thetransmitter unit 12 is mounted on arigid fixing plate 28, thus providing a reference point on thecarrier ribbon 24 for the fiber sensor. -
FIG. 3 shows a cross section through thesensor ribbon 13, as could be used by way of example for the fiber sensor shown inFIG. 2 . Theline conductors 17, two of which are provided, are arranged on the twoedges 29 and therefore enclose thesensor fiber 15 between them. This has the advantage that thesensor fibers 15, which are more sensitive than theline conductors 17, are protected. Theline conductors 17 and thesensor fibers 15 are jointly embedded in the material of thesensor ribbon 13, and this can be done, for example, by encapsulation in a silicone rubber, which ensures a high degree of flexibility of theresultant sensor ribbon 13. -
FIG. 4 shows another possible form of thesensor ribbon 13. This has exclusivelysensor fibers 15 which can be encapsulated in the manner described in relation toFIG. 3 . Furthermore, anadhesive layer 30 is applied to the lower face of thesensor ribbon 13, and connects thesensor ribbon 13 to anelectrical ribbon conductor 31. Theribbon conductor 31 has asubstrate 32 on whichconductive paths 33 have been produced, for example by structuring by etching. The entire assembly comprising thesensor ribbon 13 and theribbon conductor 31 is additionally provided with anelastic sheath 34, for example composed of rubber. - As shown in
FIG. 5 , theconductive paths 33 are produced directly on thesensor ribbon 13. This can be done, for example, by coating using the CVD method. The functionality of theribbon conductor 33 as shown inFIG. 4 is therefore at the same time integrated in thesensor ribbon 13. This assembly is also provided with asheath 34, corresponding to the embodiment shown inFIG. 4 . - The invention has been described in detail with particular reference to preferred embodiments thereof and examples, but it will be understood that variations and modifications can be effected within the spirit and scope of the invention covered by the claims which may include the phrase “at least one of A, B and C” as an alternative expression that means one or more of A, B and C may be used, contrary to the holding in Superguide v. DIRECTV, 69 USPQ2d 1865 (Fed. Cir. 2004).
Claims (15)
1-11. (canceled)
12. An optical fiber sensor comprising:
an optical sensor fiber having first and second ends;
an optical transmitter unit provided at the first end of the optical sensor fiber to transmit a measurement signal to the optical sensor fiber, the transmitter unit having an electrical connection;
an optical receiver unit physically separated from the transmitter unit and provided at the second end of the optical sensor fiber to receive the measurement signal, the receiver unit having an electrical connection; and
an electrical line routed in the fiber sensor, parallel to the optical sensor fiber to connect the electrical connection of the receiver unit to the electrical connection of the transmitter unit.
13. The fiber sensor as claimed in claim 12 , wherein
at least one of the transmitter unit and the receiver unit have a plurality of electric connections, and
the transmitter unit or the receiver unit has all electrical connections connected via the electrical line.
14. The fiber sensor as claimed in claim 13 , wherein
the transmitter unit and the receiver unit each have a plurality of electrical connections, and
all electrical connections of the transmitter unit and receiver unit are connected via the electrical line.
15. The fiber sensor as claimed in claim 12 , wherein the optical sensor fiber is integrated in a sensor ribbon.
16. The fiber sensor as claimed in claim 15 , wherein the electrical line is a line conductor, and is likewise integrated in the sensor ribbon.
17. The fiber sensor as claimed in claim 16 , wherein the electrical line has substantially the same diameter as the optical fiber.
18. The fiber sensor as claimed in claim 15 , wherein the electrical line is in the form of a ribbon conductor.
19. The fiber sensor as claimed in claim 18 , wherein the ribbon conductor and the sensor ribbon are arranged side-by-side.
20. The fiber sensor as claimed in claim 19 , wherein the ribbon conductor and the sensor ribbon are connected to one another by an adhesive layer.
21. The fiber sensor as claimed in claim 18 , wherein the electrical line is in the form of conductive paths produced directly on the sensor ribbon.
22. The fiber sensor as claimed in claim 18 , wherein
the sensor ribbon and the ribbon conductor together form an assembly, and
the assembly is sheathed with a sheath.
23. A wearable optical fiber sensor comprising:
a sensor ribbon having a plurality of optical sensor fibers, the sensor ribbon having first and second ends;
an optical transmitter unit provided at the first end of the optical sensor ribbon to transmit respective measurement signals to the optical sensor fibers, the transmitter unit having an electrical connection;
an optical receiver unit physically separated from the transmitter unit and provided at the second end of the optical sensor ribbon to receive respective measurement signals from optical sensor fibers, the receiver unit having an electrical connection;
an electrical line embedded in the sensor ribbon, parallel to the optical sensor fibers to connect the electrical connection of the receiver unit to the electrical connection of the transmitter unit; and
a battery power supply provided at the transmitter unit or the receiver unit.
24. The wearable optical fiber sensor according to claim 23 , further comprising a wireless transmitter to transmit an output signal to an external receiver, the output signal corresponding to the measurement signals.
25. The wearable optical fiber sensor according to claim 23 , further comprising a memory to store an output signal corresponding to the measurement signals.
Applications Claiming Priority (5)
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DE102007034264.2 | 2007-07-18 | ||
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DE102007046385A DE102007046385A1 (en) | 2007-07-18 | 2007-09-21 | Optical fiber sensor with electrical connections |
DE102007046385.7 | 2007-09-21 | ||
PCT/EP2008/059254 WO2009010519A1 (en) | 2007-07-18 | 2008-07-15 | Optical fiber sensor having electrical connectors |
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EP2167909A1 (en) | 2010-03-31 |
WO2009010577A1 (en) | 2009-01-22 |
EP2167913B1 (en) | 2011-05-25 |
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DE102007044555A1 (en) | 2009-01-22 |
ATE553698T1 (en) | 2012-05-15 |
ES2363187T3 (en) | 2011-07-26 |
EP2167913A1 (en) | 2010-03-31 |
WO2009010517A1 (en) | 2009-01-22 |
DE102007046826A1 (en) | 2009-01-22 |
US8435191B2 (en) | 2013-05-07 |
ATE511078T1 (en) | 2011-06-15 |
DE102007046384A1 (en) | 2009-01-22 |
EP2170167A1 (en) | 2010-04-07 |
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STCB | Information on status: application discontinuation |
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