CN104297293A - Passive radio frequency tag failure mode based conductive liquid detection sensor - Google Patents
Passive radio frequency tag failure mode based conductive liquid detection sensor Download PDFInfo
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- CN104297293A CN104297293A CN201310304893.4A CN201310304893A CN104297293A CN 104297293 A CN104297293 A CN 104297293A CN 201310304893 A CN201310304893 A CN 201310304893A CN 104297293 A CN104297293 A CN 104297293A
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- detection circuit
- conducting liquid
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Abstract
The invention relates to a passive radio frequency tag failure mode based conductive liquid detection sensor, which is mainly composed of a passive radio frequency tag IC circuit, an isolation detection circuit and a passive radio frequency tag antenna. The isolation detection circuit is disposed on an induced current loop in a passive radio frequency tag, the impedance change generated by contact of the isolation detection circuit and the conductive liquid can result in reversible on-off change of the passive radio frequency tag induced current loop, and a radio frequency reader can realize passive detection on the conductive liquid according to the on-off failure condition of the passive radio frequency tag. The detection sensor provided by the invention can overcome the installation, layout and use limitations of existing conductive liquid passive detection sensors, thus providing the sensitivity adjustable passive monitoring sensor for detection of various conductive liquids.
Description
Technical field
Patent of the present invention relates to a kind of conducting liquid detecting sensor based on passive RF label failure mode, belongs to field of sensing technologies.
Background technology
At present, sensing is detected based on the conducting liquid of radio frequency transmission principle in market and mainly includes source and passive two kinds, be mainly used in water inspection.The label of active radio frequency water inspection sensor includes battery, and its advantage is long transmission distance, is convenient to distributing installation on a large scale, and shortcoming is that power supply is changed and troublesome maintenance.Passive radio frequency water inspection sensor advantage safeguards simply, battery need not be changed, shortcoming is that transmission range is relatively short, its main operational principle has two kinds: conducting liquid detecting sensor signal is supplied to independently tag circuit transmission by (1), realizes the simple combination of traditional water inspection sensor and passive RF label; (2) adopt two passive RF labels, the antenna of a label directly soaks in water replys, by the answer signal multilevel iudge humidity condition (US8040243B2 in 2011) with another one encapsulated tags.The present invention is by changing the internal circuit of traditional passive radio-frequency (RF) tag, the i.e. isolation detection circuit of a serial or parallel connection inefficacy reversible action on its induction current loop, now, the electromagnetism failure degree of the answer signal of passive RF label directly correspond to isolation detection circuit and contacts situation with the immersion of conducting liquid, and radio frequency reader just can realize the conducting liquid passive detection based on passive RF label failure mode.
A kind of conducting liquid detecting sensor based on passive RF label failure mode of the present invention, Principles and methods is simple, and cost is little, non-maintaining, is convenient to the detection realizing rain, water, sweat, urine and all kinds of conducting liquid in all cases.
Summary of the invention
The patent technical issues that need to address of the present invention are as the detection of conducting liquid provides the detecting sensor based on passive RF label failure mode that a kind of volume is little, structure is simple and non-maintaining.
The technical solution realizing patent object of the present invention is: this conducting liquid detecting sensor based on passive RF label failure mode is primarily of passive RF label IC circuit [1], isolation detection circuit [2] and passive RF label antenna [3] composition, because isolation detection circuit [2] serial or parallel connection is on label induction current loop, isolation detection circuit contacts the impedance variation produced will be caused the reversible of passive RF label induction current performance loop to lose efficacy with conducting liquid and recover, now, whether the electromagnetism of passive RF label is replied the direct correspondence isolation detection circuit [2] that whether lost efficacy and is contacted with conducting liquid, therefore just can realize detecting the failure conditions of passive RF label by the radio frequency reader of peripheral hardware, also just achieve conducting liquid passive detection.
Conductor or the wire of isolation detection circuit [2] mutually isolated and space interval arrangement by two groups form, and conductor or separation L arrange and be usually less than 3mm.The seletion calculation standard of L value wants effective conduction when should ensure isolation detection circuit [2] contact conducting liquid, ensures insulativity when isolation detection circuit [2] does not contact conducting liquid again.The now appearance of the upper conducting liquid of isolation detection circuit [2] correspond to the conducting of isolation detection circuit [2] respectively with disappearance and isolates two kinds of phenomenons, both can connect when the characteristic of this impedance variable makes isolation detection circuit [2] use as reversible disable system and also can be parallel to the diverse location in label induction current loop, position between (1) passive RF label IC circuit [1] and passive RF label antenna [3] can have been comprised in preferred site; (2) the stabilized voltage supply circuit positions in passive RF label IC circuit [1]; (3) the modulation signal circuit positions in passive RF label IC circuit [1].Main carry out elaboration explanation for the first position figure below.
When isolation detection circuit [2] is connected on label induction current loop, the isolation of isolation detection circuit [2] resistance, conducting correspond to the disconnected, logical of label induction current loop respectively, namely when isolation detection circuit [2] meet conducting liquid time resistance decreasing time, passive RF label IC circuit [1] forms complete passive RF label with the complete conducting of current return of passive RF label antenna [3], can complete electromagnetism response; When isolation detection circuit [2] is upper because when lacking or do not have conducting liquid and cause resistance to increase isolation, the current return of passive RF label IC circuit [1] and passive RF label antenna [3] cannot effectively conducting, the passive RF label lost efficacy can not complete radio-frequency electromagnetic response, the existence of the corresponding conducting liquid of success and failure difference of at this moment radio-frequency electromagnetic response and disappearance.
Contrary with above-mentioned series connection access effect, when isolation detection circuit [2] is connected in parallel on label induction current loop, isolation detection circuit [2] is isolated, conducting correspond to the logical of label induction current loop respectively, disconnected, namely bypass leakage is formed when isolation detection circuit [2] meets conducting liquid during resistance decreasing, the current return of passive RF label IC circuit [1] and passive RF label antenna [3] cannot effectively conducting, electromagnetism response can not be completed, when isolation detection circuit [2] is upper because when lacking or do not have conducting liquid and cause resistance to become large, passive RF label IC circuit [1] and passive RF label antenna [3] form effective passive RF label, just can complete electromagnetism response, the disappearance of the corresponding conducting liquid of success and failure difference of at this moment radio-frequency electromagnetic response and existence.
In order to regulate the sensitivity of sensor, isolation detection circuit [2] can by arranging the adjustment module [5] of distance L or resistance, realize the adjustment of isolation detection circuit [2] conducting resistance threshold values, thus make this sensor become the adjustable conducting liquid passive detection sensor of a Species sensitivity.
In addition, when isolation detection circuit [2] serial or parallel connection is between passive RF label IC circuit [1] and passive RF label antenna during position, two groups of conductors of isolation detection circuit [2] or wire only need to ensure being intervally arranged of certain distance, its alteration of form does not affect conductivity detection function, therefore can design according to tuned radio-frequency rule, isolation detection circuit [2] is allowed to double as passive RF label antenna [3], make they contact conducting liquid conducting with do not contact only have a kind of situation in conducting liquid two kinds of situations under can play the effect of passive RF label antenna [3], so just can by the passive detection of differentiation realization to conducting liquid of passive RF label failure conditions.
Below in conjunction with exemplary plot, this conducting liquid detecting sensor structure based on passive RF label failure mode, principle and method of work are described in further detail.
Accompanying drawing explanation
The isolation detection circuit series connection access composition schematic diagram of a kind of conducting liquid detecting sensor based on passive RF label failure mode of Fig. 1;
The isolation detection circuit parallel connection access composition schematic diagram of a kind of conducting liquid detecting sensor based on passive RF label failure mode of Fig. 2;
Fig. 3 plane isolation detection circuit [2] exemplary plot;
Fig. 4 solid type isolation detection face circuit [2] exemplary plot;
Wherein, in above-mentioned each figure and Figure of abstract, employ unified number designation, two tie points 4, the adjustment module 5 of 1 passive RF label IC circuit, 2 isolation detection circuits, passive RF label antenna 3, isolation detection circuit and radio frequency induction current return.
Embodiment
Below in conjunction with Fig. 1, Fig. 2, Fig. 3 and Fig. 4, to the embodiment further detailed description of patent of the present invention.
Composition graphs 1, isolation detection circuit [2], primarily of passive RF label IC circuit [1], isolation detection circuit [2] and passive RF label antenna [3] composition, is connected on position between passive RF label IC circuit [1] and passive RF label antenna [3] herein by a kind of conducting liquid detecting sensor based on passive RF label failure mode of patent of the present invention.When conducting liquid medium, isolation high-impedance state is between two tie points [4] of isolation detection circuit [2], now be cut off between passive RF label IC circuit [1] and passive RF label antenna [3], radio-frequency (RF) tag lost efficacy, and can not reply the signal of radio frequency reader; When conducting liquid contacts two tie points [4] of also conducting isolation detection circuit [2], effectively connected between passive RF label IC circuit [1] and passive RF label antenna [3], radio-frequency (RF) tag is effective, the signal of radio frequency reader can be replied, material is thus formed a kind of conducting liquid detecting sensor based on passive RF label failure mode.
Composition graphs 2, isolation detection circuit [2] can also be connected in parallel on position between passive RF label IC circuit [1] and passive RF label antenna [3] by the present invention.When conducting liquid medium, high resistant isolation is between two tie points [4] of isolation detection circuit [2], now normally connect between passive RF label IC circuit [1] and passive RF label antenna [3], radio-frequency (RF) tag is effective, can reply the signal of radio frequency reader; When conducting liquid contacts two tie points [4] of also conducting isolation detection circuit [2], due to the loss of by-pass current, can not effectively conducting connect between passive RF label IC circuit [1] and passive RF label antenna [3], radio-frequency (RF) tag is invalid, the signal of radio frequency reader can not be replied, so just also form a kind of conducting liquid detecting sensor based on passive RF label failure mode.
Composition graphs 3, by two groups, mutually isolated and the conductor that plane is intervally arranged or wire form the isolation detection circuit [2] that the present invention adopts, under the prerequisite of control L distance, two groups of conductors or wire are intervally arranged by different geometries in the plane and can both realize isolation detection effect, two groups of conductors by the setting of " returning " font or the desirable 0.1mm of separation L in this legend, the now appearance of the upper conducting liquid of isolation detection circuit [2] correspond to conducting between isolation detection circuit [2] two tie point [4] respectively and isolates two kinds of phenomenons with disappearing, be convenient to the passive detection that sensor of the present invention realizes conducting liquid.
Composition graphs 4, by two groups, mutually isolated and the conductor mesh be spatially intervally arranged or traverse net form the isolation detection circuit [2] that the present invention adopts, under the prerequisite of control L distance, two groups of conductor mesh or traverse net are intervally arranged with different mesh shapes and can both realize isolation detection effect, two groups of latticed conductors of grid shape or the desirable 0.15mm of separation L in this legend, the now appearance of the upper conducting liquid of isolation detection circuit [2] also correspond to conducting between isolation detection circuit [2] two tie point [4] respectively and isolates two kinds of phenomenons with disappearing, be convenient to the passive detection that sensor of the present invention realizes conducting liquid.In this figure also at isolation detection circuit [2] by the adjustment module [5] being provided with distance L or resistance between two groups of conductor mesh or traverse net, make this sensor become the adjustable conducting liquid passive detection sensor of a Species sensitivity.
Claims (6)
1. the conducting liquid detecting sensor based on passive RF label failure mode, its architectural feature is that this sensor is primarily of passive RF label IC circuit [1], isolation detection circuit [2] and passive RF label antenna [3] composition, on the induction current loop of isolation detection circuit [2] serial or parallel connection in passive RF label, isolation detection circuit [2] contacts the impedance variation produced and the reversible break-make in passive RF label induction current loop can be caused to change with conducting liquid, radio frequency reader just can realize conducting liquid passive detection according to the break-make failure conditions of passive RF label, wherein isolation detection circuit [2] can be arranged on one of following position: link position between (1) passive RF label IC circuit [1] and passive RF label antenna [3], (2) the stabilized voltage supply loop link position in passive RF label IC circuit [1], (3) the modulation signal loop link position in passive RF label IC circuit [1].
2. a kind of conducting liquid detecting sensor based on passive RF label failure mode according to claim 1, it is characterized in that isolation detection circuit [2] is mutually isolated by two groups, the conductor of space interval arrangement or wire composition, conductor or separation L arrange and are less than 3mm, the choice criteria of L value is effective conduction when should ensure isolation detection circuit [2] contact conducting liquid, ensure insulativity when isolation detection circuit [2] does not contact conducting liquid again, the appearance of the upper conducting liquid of such isolation detection circuit [2] and the disappear conducting between two groups of conductors or wire and isolation that correspond to isolation detection circuit [2] respectively.
3. a kind of conducting liquid detecting sensor based on passive RF label failure mode according to claim 1, when it is characterized in that isolation detection circuit [2] is connected on passive RF label induced currents loop, isolation between isolation detection circuit [2] two groups of conductors or wire and conducting state correspond to the disconnected and logical of label induction current loop respectively, namely when isolation detection circuit [2] meet conducting liquid and conducting time, passive RF label IC circuit [1] forms effective passive RF label with the current return conducting of passive RF label antenna [3], electromagnetism response can be completed, when between isolation detection circuit [2] two groups of conductors or wire because when lacking or there is no conducting liquid and isolate, the current return of passive RF label IC circuit [1] and passive RF label antenna [3] cannot effectively conducting, the passive RF label lost efficacy can not complete electromagnetism response, this success and failure just making radio-frequency electromagnetic reply correspond to existence and the disappearance of conducting liquid respectively.
4. a kind of conducting liquid detecting sensor based on passive RF label failure mode according to claim 1, when it is characterized in that isolation detection circuit [2] is connected in parallel on passive RF label induced currents loop, isolation between isolation detection circuit [2] two groups of conductors or wire and conducting correspond to the logical and disconnected of label induction current loop respectively, when namely meeting conducting liquid conducting when between isolation detection circuit [2] two groups of conductors or wire and form bypass leakage, passive RF label IC circuit [1] and passive RF label antenna [3] cannot form effective radio frequency induction current return, radio-frequency electromagnetic response can not be completed, when between isolation detection circuit [2] two groups of conductors or wire because when lacking or there is no conducting liquid and be in impedance isolation, the passive RF label that passive RF label IC circuit [1] and passive RF label antenna [3] are formed does not affect by by-pass current, radio-frequency electromagnetic response can be completed, this success and failure just making radio-frequency electromagnetic reply correspond to disappearance and the existence of conducting liquid respectively.
5. according to claim 1, a kind of conducting liquid detecting sensor based on passive RF label failure mode described in 2, it is characterized in that when isolation detection circuit [2] by serial or parallel connection between passive RF label IC circuit [1] and passive RF label antenna [3] during position, be intervally arranged conductor or wire of two groups of isolation detection circuit [2] can double as passive RF label antenna [3], namely by radio-frequency electromagnetic tuning response disciplinarian request design isolated testing circuit [2] two groups of conductors be intervally arranged or wire shapes, make they contact conducting liquid conducting with do not contact only have a kind of situation in conducting liquid two kinds of situations under can play the effect of passive RF label antenna [3], so just can by the passive detection of differentiation realization to conducting liquid of passive RF label failure conditions.
6. a kind of conducting liquid detecting sensor based on passive RF label failure mode according to claim 1,2, to it is characterized in that on isolation detection circuit [2] except comprising two tie points [4] being connected with radio frequency induction current return, can also by arranging the adjustment module [5] of distance L or resistance, realize the adjustment of isolation detection circuit [2] conducting, values of isolation resistance, thus make this sensor become the adjustable conducting liquid passive detection sensor of a Species sensitivity.
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| CN201310304893.4A CN104297293A (en) | 2013-07-19 | 2013-07-19 | Passive radio frequency tag failure mode based conductive liquid detection sensor |
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| CN201310304893.4A CN104297293A (en) | 2013-07-19 | 2013-07-19 | Passive radio frequency tag failure mode based conductive liquid detection sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111199678A (en) * | 2020-03-03 | 2020-05-26 | 北京京东振世信息技术有限公司 | Label, manufacturing method thereof, packing method and package judging method |
| CN113466935A (en) * | 2021-06-30 | 2021-10-01 | 中国建筑第八工程局有限公司 | Trigger type detection device for deformation threshold detection and detection method thereof |
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| US20100123583A1 (en) * | 2008-11-18 | 2010-05-20 | The Boeing Company | Rfid-based corrosion and moisture detection |
| CN102576000A (en) * | 2009-07-09 | 2012-07-11 | 萨卢森Ip私人有限公司 | A moisture detecting module and a receiving unit |
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| US20020145525A1 (en) * | 2001-03-30 | 2002-10-10 | Augmentech, Inc. | Patient incontinence monitoring apparatus and method of use thereof |
| US7403113B2 (en) * | 2004-05-17 | 2008-07-22 | California Institute Of Technology | GaN-based sensor nodes for in situ detection of gases |
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| CN111199678A (en) * | 2020-03-03 | 2020-05-26 | 北京京东振世信息技术有限公司 | Label, manufacturing method thereof, packing method and package judging method |
| CN113466935A (en) * | 2021-06-30 | 2021-10-01 | 中国建筑第八工程局有限公司 | Trigger type detection device for deformation threshold detection and detection method thereof |
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Application publication date: 20150121 |