CN103278181A - Wireless reading circuit for passive LC resonator sensor - Google Patents
Wireless reading circuit for passive LC resonator sensor Download PDFInfo
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- CN103278181A CN103278181A CN2013101609879A CN201310160987A CN103278181A CN 103278181 A CN103278181 A CN 103278181A CN 2013101609879 A CN2013101609879 A CN 2013101609879A CN 201310160987 A CN201310160987 A CN 201310160987A CN 103278181 A CN103278181 A CN 103278181A
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Abstract
The invention discloses a wireless reading circuit for a passive LC resonator sensor. The wireless reading circuit comprises a single chip microcomputer control module, a direct digital synthesis (DDS) swept signal generating module, a radio-frequency bridge detection module, a buffer amplifier module, a key and a display module, wherein four arms of a radio-frequency bridge respectively consist of three 50 ohm precision resistors and a reading coil; and one reading coil and the passive LC sensor form a loosely coupled transformer. The passive reading circuit is simple in structure and easy to implement, and can wirelessly measure the resonant frequency of the passive LC sensor to realize the passive wireless sensor function.
Description
Technical field
The invention belongs to sensor technical field, relate to a kind of wireless sensing circuit of Passive LC resonant transducer.
Background technology
The Passive LC resonant transducer be a class by the sensor that constitutes completely without the source element, normally telefault and a sensitization capacitance LC loop that forms in parallel.The resonance frequency in this LC loop changes along with the variation of sensitization capacitance, releases variation to be measured by measuring change of resonance frequency, according to the difference of sensitization capacitance, can realize that the passive and wireless of pressure, humidity, temperature etc. parameter is measured.This class sensor is specially adapted to use in sealed environment such as the medicine of inside of human body, food containers, sealing or machinery rotation and the rugged surroundings, can work indefinitely in theory.
In order to measure the resonance frequency of this class LC resonant transducer, normally with the close sensors inductance coil of an external coil, make their form loosely coupled transformer; Utilize impedance analysis to measure the phase-frequency characteristic of this external coil then, at the sensor resonant frequency place, change phase place and minimum value will occur, be i.e. common so-called phase-dip technology.But this method is used commercial electric impedance analyzer equipment usually, and the big price height of volume is not suitable for on-the-spot the use; The frequency at phase place smallest point place is relevant with coupling coefficient in addition, makes that this measuring method is unreliable.
Summary of the invention
Technical matters: technical matters to be solved by this invention is: at the Passive LC resonant transducer, provide a kind of simple and reliable sensing circuit of hand-held, measurement result does not change with coupling coefficient between sense coil and the sensors inductance.
Technical scheme: the technical solution adopted in the present invention is: a kind of wireless sensing circuit of Passive LC resonant transducer, this circuit comprises single chip control module, swept-frequency signal generation module, radio-frequency bridge detection module, buffering amplification module, button and display module, described swept-frequency signal generation module, radio-frequency bridge detection module, buffering amplification module, button are connected with single chip control module respectively with display module, and the radio-frequency bridge detection module is connected with the buffering amplification module;
Described radio-frequency bridge detection module comprises radio-frequency bridge and sense coil, wherein the left upper arm of radio-frequency bridge, lower-left arm, right upper arm are that 50 ohm precision resistance constitutes by resistance, the bottom right arm is made of sense coil, and sense coil and Passive LC resonant transducer constitute loosely coupled transformer.
Each arm at radio-frequency bridge arranges one group of diode and supporting electric capacity, and the hybrid junction point voltage value of described radio-frequency bridge detection module utilizes the method for diode broadband demodulation to be measured.Described button connects single chip control module by the I/O interface, and described buffering amplification module connects single chip control module by the A/D interface.
Beneficial effect: the present invention compared with prior art has the following advantages:
Realized a kind of wireless sensing circuit of Passive LC resonant transducer of hand-held, this circuit structure is simple, and volume is little, is easy to realize, is suitable for on-the-spot the use.The present invention choose read inductance impedance real part as measuring object, determine sensor resonant frequency by the maximal value of impedance real part, this frequency values is not subjected to the influence of coupling coefficient.
Description of drawings
Fig. 1 is the schematic diagram of wireless sensing circuit of the present invention.
Fig. 2 is radio-frequency bridge module principle figure in the wireless sensing circuit of the present invention.
When Fig. 3 measures the Passive LC resonant transducer for adopting wireless sensing circuit of the present invention, the frequency characteristic synoptic diagram of sense coil impedance real part.
Have among the figure: single chip control module 1, DDS swept-frequency signal generation module 2, radio-frequency bridge detection module 3, buffering amplification module 4, keyboard input module 5, display module 6, sense coil 7, left upper arm 8, lower-left arm 9, right upper arm 10, first detector diode 11, the first detection load capacitance 12, second detector diode 13, the second detection load capacitance 14, the 3rd detector diode 15, the 3rd detection load capacitance 16, the 4th detector diode 17, the 4th detection load capacitance 18.
Embodiment
Below in conjunction with Figure of description the present invention is described in further detail:
The present invention relates to a kind of wireless sensing circuit of Passive LC resonant transducer, comprise single chip control module 1, swept-frequency signal generation module 2, radio-frequency bridge detection module 3, buffering amplification module 4, button 5 and display module 6, described swept-frequency signal generation module 2, radio-frequency bridge detection module 3, buffering amplification module 4, button 5 are connected with single chip control module 1 respectively with display module 6, and radio-frequency bridge detection module 3 is connected with buffering amplification module 4;
Described radio-frequency bridge detection module 3 comprises radio-frequency bridge and sense coil 7, wherein the left upper arm 8 of radio-frequency bridge, lower-left arm 9, right upper arm 10 are that 50 ohm precision resistance constitutes by resistance, the bottom right arm is made of sense coil 7, and sense coil 7 and Passive LC sensor constitute loosely coupled transformer.
Each arm at radio-frequency bridge arranges one group of diode and supporting electric capacity, and the hybrid junction point voltage value of described radio-frequency bridge detection module 3 utilizes the method for diode broadband demodulation to be measured.
Described button 5 connects single chip control module 1 by the I/O interface, and described buffering amplification module 4 connects single chip control module 1 by the A/D interface.
The present invention is described in detail below by a concrete example:
Near the Passive LC resonant transducer, sense coil 7 and sensors inductance constitute a loosely coupled transformer with sense coil 7.Needed initial frequency, step frequency and the cutoff frequency of frequency sweep and begin to measure by keyboard 5 inputs, single chip control module 1 at first sends instruction and makes the sine wave signal of its generation certain frequency and amplitude and send into radio-frequency bridge detection module 3 to DDS signal generating module 2.This detection module adopts diode broadband demodulation mode to measure the scalar voltage value of four nodes of radio-frequency bridge, and through sending into the inner A/D module of single-chip microcomputer behind the buffering amplification module 4.The single-chip microcomputer in house software calculates the impedance real part value of sense coil under the corresponding frequencies according to these four magnitudes of voltage.Single-chip microcomputer transmits control signal to signal generating module again then, makes survey frequency increase progressively, and repeats said process, until the cutoff frequency that reaches setting.In the frequency range of setting, find the corresponding frequency of maximal value of impedance real part at last, this frequency is the resonance frequency of Passive LC resonant transducer.
Wherein the computation process of radio-frequency bridge detection module is:
The left upper arm 8 of radio-frequency bridge, lower-left arm 9, right upper arm 10 are 50 ohm of precision resistances, and the sense coil 7 of bottom right arm is as unknown impedance.Four node scalar voltage are respectively incoming signal level V1, right upper arm resistance two ends level V2, the non-equilibrium level V4 of sense coil two ends level V3 and electric bridge.V1 is measured by first detector diode 11 and the first detection load capacitance 12, V2 is measured by second detector diode 13 and the second detection load capacitance 14, V3 is measured by the 3rd detector diode 15 and the 3rd detection load capacitance 16, and V4 is measured by the 4th detector diode 17 and the 4th detection load capacitance 18.Just can calculate the sense coil impedance real part by V1, V2, these four magnitudes of voltage of V3, V4, computing formula is as follows:
The impedance real part of sense coil:
Wherein SWR and Z are respectively:
The impedance real part of sense coil peak value will occur at the sensor resonant frequency place, as shown in Figure 3, can determine the resonance frequency of Passive LC resonant transducer thus, thereby obtain value to be measured.
Claims (3)
1. the wireless sensing circuit of a Passive LC resonant transducer, it is characterized in that: this circuit comprises single chip control module (1), swept-frequency signal generation module (2), radio-frequency bridge detection module (3), buffering amplification module (4), button (5) and display module (6), described swept-frequency signal generation module (2), radio-frequency bridge detection module (3), buffering amplification module (4), button (5) are connected with single chip control module (1) respectively with display module (6), and radio-frequency bridge detection module (3) is connected with buffering amplification module (4);
Described radio-frequency bridge detection module (3) comprises radio-frequency bridge and sense coil (8), wherein the left upper arm of radio-frequency bridge (10), lower-left arm (11), right upper arm (12) are that 50 ohm precision resistance constitutes by resistance, the bottom right arm is made of sense coil (8), and sense coil (8) and Passive LC resonant transducer constitute loosely coupled transformer.
2. wireless measurement circuit according to claim 1, it is characterized in that: each arm at radio-frequency bridge arranges one group of diode and supporting electric capacity, and the hybrid junction point voltage value of described radio-frequency bridge detection module (3) utilizes the method for diode broadband demodulation to be measured.
3. wireless measurement circuit according to claim 1 is characterized in that: described button (5) connects single chip control module (1) by the I/O interface, and described buffering amplification module (4) connects single chip control module (1) by the A/D interface.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512592A (en) * | 2013-09-27 | 2014-01-15 | 中国科学院电子学研究所 | Wireless passive LC resonance sensor detecting circuit and corresponding information acquiring method |
| CN106404209A (en) * | 2016-12-08 | 2017-02-15 | 佛山市海科云筹信息技术有限公司 | Temperature measuring method and device and product using temperature measuring device |
| CN106404210A (en) * | 2016-12-08 | 2017-02-15 | 佛山市海科云筹信息技术有限公司 | Temperature measuring method and device, and product using the same |
| DE102015215331A1 (en) * | 2015-08-11 | 2017-02-16 | Continental Teves Ag & Co. Ohg | Electronic control unit |
| CN107121444A (en) * | 2017-03-28 | 2017-09-01 | 东南大学 | A kind of passive and wireless humidity sensor detected based on RCS |
| CN107167205A (en) * | 2017-06-21 | 2017-09-15 | 杭州电子科技大学 | A kind of collecting method of intelligent water meter |
| CN111245391A (en) * | 2020-01-14 | 2020-06-05 | 东南大学 | Reading circuit and method for realizing impedance automatic matching of LC passive wireless sensing system |
| CN111638382A (en) * | 2020-05-14 | 2020-09-08 | 东南大学 | LC formula rotational speed sensor based on synchronous detection |
| US10866120B2 (en) | 2016-02-17 | 2020-12-15 | Continental Teves Ag & Co. Ohg | Sensor |
| US11169006B2 (en) | 2016-02-17 | 2021-11-09 | Continental Teves Ag & Co. Ohg | Sensor |
| CN113701789A (en) * | 2021-09-03 | 2021-11-26 | 东南大学 | Passive wireless LC neutral sensor based on negative resistance circuit |
| CN113758505A (en) * | 2021-09-03 | 2021-12-07 | 东南大学 | PT symmetry-based LC passive wireless dual-parameter sensing system |
| CN115128702A (en) * | 2022-06-07 | 2022-09-30 | 江南大学 | Composite microwave sensor and detection method |
| CN115307689A (en) * | 2022-10-09 | 2022-11-08 | 中国石油大学(华东) | Wireless passive temperature and humidity monitoring device and method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030139677A1 (en) * | 2002-01-22 | 2003-07-24 | Michael Fonseca | Implantable wireless sensor for pressure measurement within the heart |
| US20050022581A1 (en) * | 2003-06-10 | 2005-02-03 | Smiths Detection-Pasadena, Inc. | Sensor arrangement |
| EP1806569A1 (en) * | 2006-01-09 | 2007-07-11 | Infineon Technologies SensoNor AS | Inductive-capactive sensor |
| US20090147824A1 (en) * | 2007-12-07 | 2009-06-11 | Wt Systems, Llc | Wireless remote passive temperature sensor for monitoring food |
| US20090299216A1 (en) * | 2008-06-02 | 2009-12-03 | Po-Jui Chen | System, apparatus and method for biomedical wireless pressure sensing |
| CN102003973A (en) * | 2010-10-19 | 2011-04-06 | 首都医科大学 | Wireless passive measuring method and circuit |
| CN102175921A (en) * | 2011-03-16 | 2011-09-07 | 中国民航大学 | Portable impedance measurement instrument based on FPGA (field programmable gate array) |
| CN102305827A (en) * | 2011-08-24 | 2012-01-04 | 南京航空航天大学 | Love wave sensor testing system based on frequency sweeping technology, and a testing method thereof |
| CN102507047A (en) * | 2011-09-30 | 2012-06-20 | 中北大学 | Non-contact passive sensor signal testing system |
| CN103026365A (en) * | 2010-06-30 | 2013-04-03 | 通用电气公司 | Field-portable impedance reader and method for quantitating parameters in an environment |
| CN203231758U (en) * | 2013-05-03 | 2013-10-09 | 东南大学 | Wireless readout circuit of passive LC resonant transducer |
-
2013
- 2013-05-03 CN CN201310160987.9A patent/CN103278181B/en not_active Expired - Fee Related
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030139677A1 (en) * | 2002-01-22 | 2003-07-24 | Michael Fonseca | Implantable wireless sensor for pressure measurement within the heart |
| US20050022581A1 (en) * | 2003-06-10 | 2005-02-03 | Smiths Detection-Pasadena, Inc. | Sensor arrangement |
| EP1806569A1 (en) * | 2006-01-09 | 2007-07-11 | Infineon Technologies SensoNor AS | Inductive-capactive sensor |
| US20090147824A1 (en) * | 2007-12-07 | 2009-06-11 | Wt Systems, Llc | Wireless remote passive temperature sensor for monitoring food |
| US20090299216A1 (en) * | 2008-06-02 | 2009-12-03 | Po-Jui Chen | System, apparatus and method for biomedical wireless pressure sensing |
| CN103026365A (en) * | 2010-06-30 | 2013-04-03 | 通用电气公司 | Field-portable impedance reader and method for quantitating parameters in an environment |
| CN102003973A (en) * | 2010-10-19 | 2011-04-06 | 首都医科大学 | Wireless passive measuring method and circuit |
| CN102175921A (en) * | 2011-03-16 | 2011-09-07 | 中国民航大学 | Portable impedance measurement instrument based on FPGA (field programmable gate array) |
| CN102305827A (en) * | 2011-08-24 | 2012-01-04 | 南京航空航天大学 | Love wave sensor testing system based on frequency sweeping technology, and a testing method thereof |
| CN102507047A (en) * | 2011-09-30 | 2012-06-20 | 中北大学 | Non-contact passive sensor signal testing system |
| CN203231758U (en) * | 2013-05-03 | 2013-10-09 | 东南大学 | Wireless readout circuit of passive LC resonant transducer |
Non-Patent Citations (4)
| Title |
|---|
| REINHARD NOPPER 等: "A WIRELESS SENSOR READOUT SYSTEM—CIRCUIT CONCEPT, SIMULATION, AND ACCURACY", 《IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT》, vol. 60, no. 8, 31 August 2011 (2011-08-31), XP011369926, DOI: doi:10.1109/TIM.2011.2122110 * |
| 刘鹏飞: "LC谐振式耐高温加速度传感器的设计", 《中国优秀硕士学位论文全文数据库》, no. 10, 31 October 2011 (2011-10-31) * |
| 吕志军 等: "用于微传感器读出电路的输出缓冲放大器", 《北京大学学报(自然科学版)》, vol. 40, no. 3, 31 May 2004 (2004-05-31) * |
| 周振: "基于MEMS悬臂梁压阻桥式传感器的检测仪的研制", 《中国优秀硕士学位论文全文数据库》, no. 08, 31 August 2012 (2012-08-31) * |
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103512592B (en) * | 2013-09-27 | 2016-01-20 | 中国科学院电子学研究所 | Wireless and passive LC resonant transducer testing circuit and corresponding information getting method |
| CN103512592A (en) * | 2013-09-27 | 2014-01-15 | 中国科学院电子学研究所 | Wireless passive LC resonance sensor detecting circuit and corresponding information acquiring method |
| DE102015215331A1 (en) * | 2015-08-11 | 2017-02-16 | Continental Teves Ag & Co. Ohg | Electronic control unit |
| US10571307B2 (en) | 2015-08-11 | 2020-02-25 | Continental Teves Ag & Co. Ohg | Electronic control device |
| EP3335012B1 (en) * | 2015-08-11 | 2021-06-02 | Continental Teves AG & Co. OHG | Electronic control unit |
| US10866120B2 (en) | 2016-02-17 | 2020-12-15 | Continental Teves Ag & Co. Ohg | Sensor |
| US11169006B2 (en) | 2016-02-17 | 2021-11-09 | Continental Teves Ag & Co. Ohg | Sensor |
| CN106404209A (en) * | 2016-12-08 | 2017-02-15 | 佛山市海科云筹信息技术有限公司 | Temperature measuring method and device and product using temperature measuring device |
| CN106404210A (en) * | 2016-12-08 | 2017-02-15 | 佛山市海科云筹信息技术有限公司 | Temperature measuring method and device, and product using the same |
| CN106404209B (en) * | 2016-12-08 | 2019-04-05 | 佛山市海科云筹信息技术有限公司 | A kind of temp measuring method, device and the product using the temperature measuring equipment |
| CN107121444A (en) * | 2017-03-28 | 2017-09-01 | 东南大学 | A kind of passive and wireless humidity sensor detected based on RCS |
| CN107167205A (en) * | 2017-06-21 | 2017-09-15 | 杭州电子科技大学 | A kind of collecting method of intelligent water meter |
| CN111245391A (en) * | 2020-01-14 | 2020-06-05 | 东南大学 | Reading circuit and method for realizing impedance automatic matching of LC passive wireless sensing system |
| CN111245391B (en) * | 2020-01-14 | 2023-05-16 | 东南大学 | Readout circuit and method for realizing automatic impedance matching of LC passive wireless sensing system |
| CN111638382A (en) * | 2020-05-14 | 2020-09-08 | 东南大学 | LC formula rotational speed sensor based on synchronous detection |
| CN113758505A (en) * | 2021-09-03 | 2021-12-07 | 东南大学 | PT symmetry-based LC passive wireless dual-parameter sensing system |
| CN113701789B (en) * | 2021-09-03 | 2022-11-29 | 东南大学 | Passive wireless LC neutral sensor based on negative resistance circuit |
| CN113701789A (en) * | 2021-09-03 | 2021-11-26 | 东南大学 | Passive wireless LC neutral sensor based on negative resistance circuit |
| CN115128702A (en) * | 2022-06-07 | 2022-09-30 | 江南大学 | Composite microwave sensor and detection method |
| CN115128702B (en) * | 2022-06-07 | 2023-07-04 | 江南大学 | Composite microwave sensor and detection method |
| CN115307689A (en) * | 2022-10-09 | 2022-11-08 | 中国石油大学(华东) | Wireless passive temperature and humidity monitoring device and method |
| CN115307689B (en) * | 2022-10-09 | 2023-01-24 | 中国石油大学(华东) | Wireless passive temperature and humidity monitoring device and method |
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