CN103346775A - Interpretation circuit for interference type optical fiber strain transducer - Google Patents
Interpretation circuit for interference type optical fiber strain transducer Download PDFInfo
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- CN103346775A CN103346775A CN2013102320419A CN201310232041A CN103346775A CN 103346775 A CN103346775 A CN 103346775A CN 2013102320419 A CN2013102320419 A CN 2013102320419A CN 201310232041 A CN201310232041 A CN 201310232041A CN 103346775 A CN103346775 A CN 103346775A
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Abstract
The invention discloses an interpretation circuit for an interference type optical fiber strain transducer. The interpretation circuit comprises a three-phase current and voltage changing circuit, a three-input adder circuit, a one third attenuator circuit, a three-phase comparator circuit, a pulse generation and steering interpretation circuit and a corner counting circuit. The three-phase current and voltage changing circuit changes an interference optical signal output by the interference type optical fiber strain transducer to obtain a three-phase voltage signal, and the three-input adder circuit, the one third attenuator circuit, the three-phase comparator circuit and a programmable logic device generate counting pulse signals, generate adding and subtracting counting index signals according to the rotation direction of a three-phase vector, and generate signals about whether the three-phase vector stops rotating or not. A twelve-digit changing result and a synchronous trigger signal are finally output. The synchronous trigger signal corresponds to axial strain of a detected part, and therefore twelve-digit data comprising the three-vector rotation direction and angle value information and the synchronous trigger signal are obtained so as to facilitate circuit receiving of follow-up digital signals and further processing of a digital-analogue conversion circuit.
Description
Technical field:
The present invention relates to electricity field, relate in particular to analog to digital conversion circuit, particularly a kind of interpretation circuit for the interference-type optical fiber strain transducer.
Background technology:
The interference-type optical fiber strain transducer is widely used in the strain measurement.The interference-type optical fiber strain transducer is based on interference of light principle.The interference light signal of transducer output obtains three-phase current signal I1, I2, I3 through the photodiode conversion, and current signal I1, I2, I3 are corresponding with the axial strain of measured piece.In the prior art, current signal I1, I2, I3 are analog signal, and three vector direction of rotation of measured piece and digital signal and the synchronous triggering signal of angle value can not be provided.
Summary of the invention:
The object of the present invention is to provide a kind of interpretation circuit for the interference-type optical fiber strain transducer, the signal that described this interpretation circuit for the interference-type optical fiber strain transducer will solve the interference-type optical fiber strain transducer that prior art obtains through the photodiode conversion can not provide measured piece three vector direction of rotation and the digital signal of angle value and the technical problem of synchronous triggering signal.
This interpretation circuit for the interference-type optical fiber strain transducer of the present invention, comprise the three-phase current voltage conversion circuit, the three-input adder circuit, 1/3 attenuator circuit, three phase comparator circuits, a pulse generates and turns to interpretation circuit and a corner counting circuit, wherein, described three-phase current voltage conversion circuit includes three current-voltage conversion circuits, the output of any one described current-voltage conversion circuit all is connected to the input of described three-input adder circuit, the output of three-input adder circuit is connected with the input of described 1/3 attenuator circuit, described three phase comparator circuits include three comparators, the output of 1/3 attenuator circuit is connected with the input of described three comparators simultaneously, the output of any one current-voltage conversion circuit all is connected with the input of a comparator separately, the output of three comparators all is connected to the input that described pulse generated and turned to the interpretation circuit simultaneously, and pulse generates and turns to the output of interpretation circuit to be connected with the output of described corner counting circuit.
Further, any one described current-voltage conversion circuit all comprises first operational amplifier separately, the inverting input of any one described first operational amplifier all is connected with the negative pole of a photodiode separately, anodal all ground connection of any one described photodiode, the equal ground connection of the in-phase input end of any one first operational amplifier all is connected in series with first resistor and first potentiometer separately between the output of any one operational amplifier and its inverting input.
Further, described three-input adder circuit and 1/3 attenuator circuit comprise three second resistors that are set up in parallel and second operational amplifier, one end of any one described second resistor all is connected with the in-phase input end of described second operational amplifier, the other end of any one second resistor all is connected with the output of first operational amplifier separately, and the output of second operational amplifier is connected with the inverting input of second operational amplifier.
Further, any one described comparator all comprises the 3rd operational amplifier separately, the inverting input of any one described the 3rd operational amplifier all is connected with the output of a described current-voltage conversion circuit separately, all be connected in series with the 3rd resistor between the output of any one the 3rd operational amplifier and its in-phase input end separately, the in-phase input end of any one the 3rd operational amplifier all is connected with the output of described 1/3 attenuator circuit by the 4th resistor separately.
Further, described pulse generates and turns to the interpretation circuit to comprise first AND circuit, second AND circuit, the 3rd AND circuit, an OR circuit, a digital signal level modular converter and three d type flip flops, described first AND circuit, second AND circuit and the 3rd AND circuit all comprise a first input end separately, second input and an output, first AND circuit, the first input end of second AND circuit and the 3rd AND circuit all is connected with the output of a described comparator separately, second input of first AND circuit is connected to the first input end of second AND circuit, second input of second AND circuit is connected to the first input end of the 3rd AND circuit, described OR circuit comprises three inputs and an output, first AND circuit, second input of second AND circuit and the 3rd AND circuit all is connected with an input of described OR circuit separately, described digital signal level modular converter comprises a digital signal level input, a narrow pulse signal output and a clock frequency output, described digital signal level input is connected with the output of described OR circuit, any one described d type flip flop all comprises a data input separately, a clock frequency input and a temporal data output, the data input pin of any one d type flip flop all is connected with the output of a described comparator separately, and the clock frequency input of any one d type flip flop all is connected to the clock frequency output of digital signal level modular converter simultaneously.
Further, described corner counting circuit comprises a programmable logic controller (PLC) and a logical transition module, described programmable logic controller (PLC) comprises ten binary digit signal output ports, a follow-up equipment triggering signal output, a narrow pulse signal input, a zero clearing terminal, a first input end and second input, described logical transition module comprises three comparator signal inputs, three d type flip flop signal input parts, a first input end and second input, any one comparator signal input of logical transition module is connected with the output of a described comparator separately, any one d type flip flop signal input part of logical transition module is connected with the temporal data output of a described d type flip flop separately, the first input end of logical transition module is connected with the first input end of programmable logic controller (PLC), second input of logical transition module is connected with second input of programmable logic controller (PLC), the narrow pulse signal input of programmable logic controller (PLC) is connected with the narrow pulse signal output of described digital signal level modular converter, and the zero clearing terminal of programmable logic controller (PLC) is connected with a reset switch.
Further, second input of the 3rd AND circuit is connected with the output of a described comparator.
Further, described programmable logic controller (PLC) is made of 12 bidirectional counters.
The present invention and prior art are compared, and its effect is actively with tangible.The present invention utilizes the three-phase current voltage conversion circuit that the interference light signal conversion of interference-type optical fiber strain transducer output is obtained three-phase voltage signal, utilize the three-input adder circuit, 1/3 attenuator circuit, three phase comparator circuits and programmable logic device produce counting pulse signal, and produce the plus-minus counting index signal according to the direction of rotation of three phasor1s, and three phasor1s halt-transfer signal whether, utilize programmable logic device whether under the control of halt-transfer signal counting pulse signal to be carried out two-way counting or stops counting in plus-minus counting index signal and three phasor1s, final output 12 bit map end value and synchronous triggering signals, this signal is corresponding with the axial strain of measured piece, thereby obtains containing 12 bit data and the synchronous triggering signal of three vector direction of rotation and angle value information.
Description of drawings:
Fig. 1 is the theory diagram of a kind of interpretation circuit for the interference-type optical fiber strain transducer of the present invention.
Fig. 2 is the clock-face diagram of input three-phase current signal of an embodiment of a kind of interpretation circuit for the interference-type optical fiber strain transducer of the present invention.
Fig. 3 is the clock-face diagram of three-phase voltage signal of an embodiment three-phase current voltage conversion circuit output of a kind of interpretation circuit for the interference-type optical fiber strain transducer of the present invention.
Fig. 4 is the structure chart of a current-voltage conversion circuit of a kind of interpretation circuit for the interference-type optical fiber strain transducer of the present invention.
Fig. 5 is to be the circuit structure diagram of three-input adder circuit, 1/3 attenuator circuit and three phase comparators of a kind of interpretation circuit for the interference-type optical fiber strain transducer of the present invention.
Fig. 6 is the structure chart that the count pulse of a kind of interpretation circuit for the interference-type optical fiber strain transducer of the present invention generated and turned to interpretation circuit and corner counter.
Embodiment:
Embodiment 1:
As shown in Figure 1, a kind of interpretation circuit for the interference-type optical fiber strain transducer of the present invention, comprise three-phase current voltage conversion circuit 101, three- input adder circuit 102,1/3 attenuator circuit 103, three phase comparator circuits 104, a pulse generates and turns to interpretation circuit 105 and a corner counting circuit 106, wherein, described three-phase current voltage conversion circuit 101 includes three current-voltage conversion circuits 1011, the output of any one described current-voltage conversion circuit 1011 all is connected to the input of described three-input adder circuit 102, the output of three-input adder circuit 102 is connected with the input of described 1/3 attenuator circuit 103, described three phase comparator circuits 104 include three comparators 1041, the output of 1/3 attenuator circuit 103 is connected with the input of described three comparators 1041 simultaneously, the output of any one current-voltage conversion circuit 1011 all is connected with the input of a comparator 1041 separately, the output of three comparators 1041 all is connected to the input that described pulse generated and turned to interpretation circuit 105 simultaneously, and pulse generates and turns to the output of interpretation circuit 105 to be connected with the output of described corner counting circuit 106.
As shown in Figure 4, any one described current-voltage conversion circuit 1011 all comprises first an operational amplifier U1 separately, the inverting input of any one described first operational amplifier U1 all is connected with the negative pole of a photodiode D1 separately, anodal all ground connection of any one described photodiode D1, the equal ground connection of the in-phase input end of any one first operational amplifier U1 all is connected in series with first a resistor R1 and first a potentiometer W1 separately between the output of any one operational amplifier and its inverting input.
As shown in Figure 5, described three- input adder circuit 102 and 1/3 attenuator circuit 103 comprise the second resistor R14 that is set up in parallel, the second resistor R15, the second resistor R16 and second an operational amplifier U4A, the second resistor R14, the second resistor R15, the end of the second resistor R16 all is connected with the in-phase input end of the described second operational amplifier U4A, the second resistor R14, the second resistor R15, the other end of the second resistor R16 all is connected with the output of first an operational amplifier U1 separately, and the output of the second operational amplifier U4A is connected with the inverting input of the second operational amplifier U4A.
Further, three phase comparator circuits 104 include the 3rd an operational amplifier U4B, the 3rd an operational amplifier U4C and the 3rd an operational amplifier U4D, the 3rd operational amplifier U4B, the inverting input of the 3rd operational amplifier U4C and the 3rd operational amplifier U4D is connected with the output of a current-voltage conversion circuit 1011 separately, be connected in series with the 3rd a resistor R22 between the output of the 3rd operational amplifier U4B and its in-phase input end, the in-phase input end of the 3rd operational amplifier U4B is connected with the output of described 1/3 attenuator circuit 103 by the 4th a resistor R21, be connected in series with the 3rd a resistor R24 between the output of the 3rd operational amplifier U4C and its in-phase input end, the in-phase input end of the 3rd operational amplifier U4C is connected with the output of 1/3 attenuator circuit 103 by the 4th a resistor R23, be connected in series with the 3rd a resistor R26 between the output of the 3rd operational amplifier U4D and its in-phase input end, the in-phase input end of the 3rd operational amplifier U4D is connected with the output of 1/3 attenuator circuit 103 by the 4th a resistor R25.
As shown in Figure 6, further, described pulse generates and turns to interpretation circuit 105 to comprise first AND circuit, second AND circuit, the 3rd AND circuit, an OR circuit, a digital signal level modular converter DEto2CLK and three d type flip flops, described first AND circuit, second AND circuit and the 3rd AND circuit all comprise a first input end separately, second input and an output, first AND circuit, the first input end of second AND circuit and the 3rd AND circuit all is connected with the output of a described comparator 1041 separately, second input of first AND circuit is connected to the first input end of second AND circuit, second input of second AND circuit is connected to the first input end of the 3rd AND circuit, described OR circuit comprises three inputs and an output, first AND circuit, second input of second AND circuit and the 3rd AND circuit all is connected with an input of described OR circuit separately, described digital signal level modular converter DEto2CLK comprises a digital signal level input DE, a narrow pulse signal output CP and a clock frequency output CLK, described digital signal level input DE is connected with the output of described OR circuit, any one described d type flip flop all comprises a data input D separately, a clock frequency input〉CLK and a temporal data output Q, the data input pin D of any one d type flip flop all is connected with the output of a described comparator 1041 separately, the clock frequency input of any one d type flip flop〉CLK all is connected to the clock frequency output CLK of digital signal level modular converter DEto2CLK simultaneously.
Further, described corner counting circuit 106 comprises a programmable logic controller (PLC) CNT12 and a logical transition module HDandUD, described programmable logic controller (PLC) CNT12 comprises ten binary digit signal output port D0～D11, a follow-up equipment triggering signal output DT, a narrow pulse signal input CP, a zero clearing terminal CD, a first input end HD and second an input UD, described logical transition module HDandUD comprises comparator signal input S1, comparator signal input S2, comparator signal input S3, d type flip flop signal input part Q1, d type flip flop signal input part Q2, d type flip flop signal input part Q3, a first input end HD and second an input UD, the comparator signal input S1 of logical transition module HDandUD, comparator signal input S2 is connected with the output of a described comparator 1041 separately with comparator signal input S3, any one d type flip flop signal input part of logical transition module HDandUD is connected with the temporal data output Q of a described d type flip flop separately, the first input end HD of logical transition module HDandUD is connected with the first input end HD of programmable logic controller (PLC) CNT12, the second input UD of logical transition module HDandUD is connected with the second input UD of programmable logic controller (PLC) CNT12, the narrow pulse signal input CP of programmable logic controller (PLC) CNT12 is connected with the narrow pulse signal output CP of described digital signal level modular converter DEto2CLK, and the zero clearing terminal CD of programmable logic controller (PLC) CNT12 is connected with a reset switch.
Further, the second input UD of the 3rd AND circuit is connected with the output of a described comparator 1041.
Further, described programmable logic controller (PLC) CNT12 is made of 12 bidirectional counters.
The operation principle of present embodiment is:
As shown in Figures 2 and 3, the interference light signal of interference-type optical fiber strain transducer output obtains three-phase current signal I1, I2 and I3 through the photodiode conversion, and this signal is corresponding with the axial strain of measured piece.Three-phase current voltage conversion circuit 101 is converted to three-phase voltage signal V1, V2 and V3 with three-phase current signal I1, I2 and I3.
Concrete, as shown in Figure 4, three-phase current signal I1, I2 and I3 are respectively from the output of the photodiode D1 of three current-voltage conversion circuit 1011 front ends, potentiometer W1 in the negative feedback loop in the current-voltage conversion circuit 1011 can regulate electric current to the conversion ratio of voltage, in order to obtain three-phase voltage signal V1, V2 and V3 that amplitude equates.
As shown in Figure 5, the resistance of the second resistor R14 that connects on the in-phase input end of the second operational amplifier U4A, the second resistor R15 and the second resistor R16 equates, then obtains voltage signal Vr at the output of the second operational amplifier U4A, and
Because the operation principle of interference-type optical fiber strain transducer, having determined has flip-flop in the three-phase signal, and D. C. value is greater than the unimodal value that exchanges, again because three-phase alternating current composition amplitude equates and phase difference is 120 °, so in the ideal case, do not contain alternating component among the Vr, Vr is the mean value of three-phase signal flip-flop.
As shown in Figure 5, three phase comparator circuits 104 are reference with Vr, V1, V2 and V3 are converted into square-wave signal S1, S2 and S3, the 3rd operational amplifier U4B in any one comparator 1041 in three phase comparator circuits 104 realizes a certain amount of positive feedback via resistor R21 and R22 separately, guarantee that comparator 1041 has a certain amount of return difference, effectively suppress the influence of noise jamming.
As shown in Figure 6, three AND circuit and an OR circuit constitute a voting logic.Obviously, square-wave signal S1, S2 have the vector correlation identical with Fig. 3 with S3, be reference with S1, can get relation table such as following table, each variation of the digital signal level input DE end on the digital signal level modular converter DEto2CLK is all representing three phasor1s and is rotating one 60 °.
Digital signal level modular converter DEto2CLK becomes a forward burst pulse with the flop transition each time of DE, narrow pulse signal CP and clock frequency signal CLK that this burst pulse obtains having suitable sequential relationship through the two-way delay adjustment circuit.Narrow pulse signal CP offers programmable logic controller (PLC) CNT12 as being counted pulse, and clock frequency signal CLK is in order to trigger three d type flip flops.
The temporal data signal Q1 of square-wave signal S1, S2 and S3 and three d type flip flop outputs, Q2, Q3 are used as the input signal of logical transition module HDandUD, transmit whether halt-transfer signal HD of three phasor1s between the first input end HD of logical transition module HDandUD and the first input end HD of programmable logic controller (PLC) CNT12, transmit plus-minus counting index signal UD between second input of logical transition module HDandUD and second input of programmable logic controller (PLC) CNT12, the truth table that logical transition module HDandUD realizes is as follows:
Suppose, initial position S1 between 0-60 °, then after the CLK rising edge, Q1=1, Q2=1, Q3=0.If be rotated in the forward S1 between 60-120 °, S1=1 then, S2=0, S3=0, so there is HD=0 to represent that rotation is arranged, UD=1 represents to be rotated in the forward.If reverse rotation to S1 between 300-360 °, S1=0 then, S2=1, S3=0, so there is HD=0 to represent that rotation is arranged, UD=0 represents reverse rotation.
It is 12 kinds of situations of a codomain unit that above-mentioned truth table has been expressed with π/3, and wherein 6 kinds for being rotated in the forward, and 6 kinds are reverse rotation, and when not belonging to above-mentioned 12 kinds of situations, HD=1 represents without spin.
In the present embodiment, programmable logic controller (PLC) CNT12 adopts 12 bidirectional counters, does to add counting when HD=0 and UD=1, does to subtract counting when HD=0 and UD=0, keeps initial value when HD=1.
The external reset switch of zero clearing terminal CD of programmable logic controller (PLC) CNT12, this switch closure makes the output D11 of CNT12 be cleared to " 100000000000 " to D0,10 corresponding system numbers are 2048, amount greater than this value is the counting forward value, corresponding normal strain, amount less than this value is the counting in reverse value, corresponding negative strain.
It is the triggering signal of follow-up equipment preparation that follow-up equipment triggering signal output DT is one, and after D11 arrived the each vary stable of D0 numerical value, a direct impulse appearred in DT.
The codomain of present embodiment output is 0-4095, and 2048 be zero-bit basic point value, then doing makes zero handles afterwards that the codomain scope is-2048 to+2047.Therefore measurable scope is exactly-2048 to+2047 digits behind the adapted interference-type optical fiber strain transducer, and this unit is 1/6 optical maser wavelength, and parameters such as the physical size of combined sensor and optical fibre refractivity can calculate the strain value of testee.
Claims (8)
1. interpretation circuit that is used for the interference-type optical fiber strain transducer, comprise the three-phase current voltage conversion circuit, the three-input adder circuit, 1/3 attenuator circuit, three phase comparator circuits, a pulse generates and turns to interpretation circuit and a corner counting circuit, it is characterized in that: described three-phase current voltage conversion circuit includes three current-voltage conversion circuits, the output of any one described current-voltage conversion circuit all is connected to the input of described three-input adder circuit, the output of three-input adder circuit is connected with the input of described 1/3 attenuator circuit, described three phase comparator circuits include three comparators, the output of 1/3 attenuator circuit is connected with the input of described three comparators simultaneously, the output of any one current-voltage conversion circuit all is connected with the input of a comparator separately, the output of three comparators all is connected to the input that described pulse generated and turned to the interpretation circuit simultaneously, and pulse generates and turns to the output of interpretation circuit to be connected with the output of described corner counting circuit.
2. a kind of interpretation circuit for the interference-type optical fiber strain transducer as claimed in claim 1, it is characterized in that: any one described current-voltage conversion circuit all comprises first operational amplifier separately, the inverting input of any one described first operational amplifier all is connected with the negative pole of a photodiode separately, anodal all ground connection of any one described photodiode, the equal ground connection of the in-phase input end of any one first operational amplifier all is connected in series with first resistor and first potentiometer separately between the output of any one operational amplifier and its inverting input.
3. a kind of interpretation circuit for the interference-type optical fiber strain transducer as claimed in claim 2, it is characterized in that: described three-input adder circuit and 1/3 attenuator circuit comprise three second resistors that are set up in parallel and second operational amplifier, one end of any one described second resistor all is connected with the in-phase input end of described second operational amplifier, the other end of any one second resistor all is connected with the output of first operational amplifier separately, and the output of second operational amplifier is connected with the inverting input of second operational amplifier.
4. a kind of interpretation circuit for the interference-type optical fiber strain transducer as claimed in claim 1, it is characterized in that: any one described comparator all comprises the 3rd operational amplifier separately, the inverting input of any one described the 3rd operational amplifier all is connected with the output of a described current-voltage conversion circuit separately, all be connected in series with the 3rd resistor between the output of any one the 3rd operational amplifier and its in-phase input end separately, the in-phase input end of any one the 3rd operational amplifier all is connected with the output of described 1/3 attenuator circuit by the 4th resistor separately.
5. a kind of interpretation circuit for the interference-type optical fiber strain transducer as claimed in claim 1, it is characterized in that: described pulse generates and turns to the interpretation circuit to comprise first AND circuit, second AND circuit, the 3rd AND circuit, an OR circuit, a digital signal level modular converter and three d type flip flops, described first AND circuit, second AND circuit and the 3rd AND circuit all comprise a first input end separately, second input and an output, first AND circuit, the first input end of second AND circuit and the 3rd AND circuit all is connected with the output of a described comparator separately, second input of first AND circuit is connected to the first input end of second AND circuit, second input of second AND circuit is connected to the first input end of the 3rd AND circuit, described OR circuit comprises three inputs and an output, first AND circuit, second input of second AND circuit and the 3rd AND circuit all is connected with an input of described OR circuit separately, described digital signal level modular converter comprises a digital signal level input, a narrow pulse signal output and a clock frequency output, described digital signal level input is connected with the output of described OR circuit, any one described d type flip flop all comprises a data input separately, a clock frequency input and a temporal data output, the data input pin of any one d type flip flop all is connected with the output of a described comparator separately, and the clock frequency input of any one d type flip flop all is connected to the clock frequency output of digital signal level modular converter simultaneously.
6. a kind of interpretation circuit for the interference-type optical fiber strain transducer as claimed in claim 5, it is characterized in that: described corner counting circuit comprises a programmable logic controller (PLC) and a logical transition module, described programmable logic controller (PLC) comprises ten binary digit signal output ports, a follow-up equipment triggering signal output, a narrow pulse signal input, a zero clearing terminal, a first input end and second input, described logical transition module comprises three comparator signal inputs, three d type flip flop signal input parts, a first input end and second input, any one comparator signal input of logical transition module is connected with the output of a described comparator separately, any one d type flip flop signal input part of logical transition module is connected with the temporal data output of a described d type flip flop separately, the first input end of logical transition module is connected with the first input end of programmable logic controller (PLC), second input of logical transition module is connected with second input of programmable logic controller (PLC), the narrow pulse signal input of programmable logic controller (PLC) is connected with the narrow pulse signal output of described digital signal level modular converter, and the zero clearing terminal of programmable logic controller (PLC) is connected with a reset switch.
7. a kind of interpretation circuit for the interference-type optical fiber strain transducer as claimed in claim 5, it is characterized in that: second input of the 3rd AND circuit is connected with the output of a described comparator.
8. a kind of interpretation circuit for the interference-type optical fiber strain transducer as claimed in claim 6, it is characterized in that: described programmable logic controller (PLC) is made of 12 bidirectional counters.
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| CN201310232041.9A CN103346775B (en) | 2013-06-13 | 2013-06-13 | A kind of interpretation circuit for interference-type optical fiber strain transducer |
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| CN201310232041.9A CN103346775B (en) | 2013-06-13 | 2013-06-13 | A kind of interpretation circuit for interference-type optical fiber strain transducer |
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| CN103346775B CN103346775B (en) | 2015-10-14 |
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| US5019981A (en) * | 1989-03-09 | 1991-05-28 | Fuji Jukogyo Kabushiki Kaisha | Device and method for decreasing power consumption of a steering angle detecting system for vehicle |
| CN1760635A (en) * | 2004-10-13 | 2006-04-19 | 上海安文信息技术有限公司 | Sensing system of fiber strain |
| CN102032866A (en) * | 2009-10-06 | 2011-04-27 | 株式会社捷太格特 | Rotational angle detection device and electric power steering system |
| CN203368440U (en) * | 2013-06-13 | 2013-12-25 | 上海安文桥梁检测技术有限公司 | Interpretation circuit for interference type fiber strain sensor |
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2013
- 2013-06-13 CN CN201310232041.9A patent/CN103346775B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5019981A (en) * | 1989-03-09 | 1991-05-28 | Fuji Jukogyo Kabushiki Kaisha | Device and method for decreasing power consumption of a steering angle detecting system for vehicle |
| CN1760635A (en) * | 2004-10-13 | 2006-04-19 | 上海安文信息技术有限公司 | Sensing system of fiber strain |
| CN102032866A (en) * | 2009-10-06 | 2011-04-27 | 株式会社捷太格特 | Rotational angle detection device and electric power steering system |
| CN203368440U (en) * | 2013-06-13 | 2013-12-25 | 上海安文桥梁检测技术有限公司 | Interpretation circuit for interference type fiber strain sensor |
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| 宋诗哲: "《腐蚀电化学研究方法》", 31 December 1998 * |
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