CN103727964B - A kind of mechanics parameter based on LC resonant transducer measures system and measuring method - Google Patents
A kind of mechanics parameter based on LC resonant transducer measures system and measuring method Download PDFInfo
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- CN103727964B CN103727964B CN201310590178.1A CN201310590178A CN103727964B CN 103727964 B CN103727964 B CN 103727964B CN 201310590178 A CN201310590178 A CN 201310590178A CN 103727964 B CN103727964 B CN 103727964B
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Abstract
The invention discloses a kind of mechanics parameter based on LC resonant transducer and measure system and measuring method, described system includes DDS swept-frequency signal source module, high-frequency power amplifier module, the first phase shifter, the second phase shifter, Mutual Inductance Coupling front-end module, phase difference detection module, signal acquisition module, CPU；When system applies sinusoidal alternating pumping signal to front end reading antenna, if the LC resonant transducer in far-end test environment occurs undesirable mutual electromagnetic inductance to couple therewith, reading antenna end input impedance will be caused to change, so that the phase frequency curve of antenna end sinusoidal alternating pumping signal produces a peak value relevant to LC sensor resonant frequency, by extracting the frequency at peak value, obtain the resonant frequency change of LC resonant transducer, it is possible to extrapolate the change of tested mechanics parameter in environment.
Description
Technical field
The present invention relates to LC resonant transducer technical field, in particular a kind of LC resonant transducer impedance phase
The mechanics parameter of Parametric Detection measures system and measuring method.
Background technology
Along with the aspects such as modern medical service, space flight and country's Important Project research are to parameter testing demand under extreme environment
Increasing, traditional method of testing and means of testing have shown significant limitation, (the highest under some adverse circumstances
Temperature, high pressure) key parameter test remain blind area.Mostly traditional mechanics sensor is based on silica-based MEMS structure,
Measuring method is all to use physical conductors to carry out the signal of telecommunication to be connected with the structure of test system, but under extreme environment,
Traditional sensor mechanics elastic construction unstability, wire lost efficacy, was also not suitable for battery to sensor power simultaneously.Use
Passive and wireless LC resonant transducer can effectively solve adverse circumstances lower sensor to key by the method for non-cpntact measurement
The sensitivity of parameter and test problem.
At present, the sensor design of the type is at the early-stage in China, and the measurement of passive and wireless LC sensor is led to demarcating
Often use large-scale measuring instrument, build complicated and low precision measurement system and complete, this low level laboratory measurement method
Increasingly can not meet the requirement of LC resonant transducer practical engineering application test environment.Passive and wireless LC sensor
Measuring is all to carry out signal testing at laboratory employing electric impedance analyzer, but owing to electric impedance analyzer volume is big, weight
Weight, mobile inconvenient, it is not directly applicable in the engineering test of reality.
Summary of the invention
The present invention is to solve in the mechanics parameter test of (such as high temperature, high pressure) under adverse circumstances, traditional test side
Method and means of testing exist significant limitation, depend on bulky testing impedance instrument, hardware is difficult to and essence
Spend the problems such as low, it is proposed that a kind of mechanics parameter based on undesirable mutual electromagnetic inductance coupling LC resonant transducer measures system and method.
An aspect of of the present present invention is to propose a kind of Method for Phase Difference Measurement based on undesirable mutual electromagnetic inductance coupling, and the method is read by detection
Take antenna end and cause the phase frequency curve of sinusoidal alternating signal to change due to Mutual Inductance Coupling, read in far-end test environment LC without
The resonant frequency change of line passive sensor.
The ultimate principle of described measuring method is: when system applies sinusoidal alternating pumping signal to front end reading antenna, as
Really the LC resonant transducer in far-end test environment occurs undesirable mutual electromagnetic inductance to couple therewith, will cause the input resistance of reading antenna end
Resist and change, so that the phase frequency curve of antenna end sinusoidal alternating pumping signal produces one and LC sensor resonant
The peak value of frequency dependence, by extracting the frequency at peak value, obtains the resonant frequency change of LC resonant transducer, so that it may
To extrapolate the change of tested mechanics parameter in environment.
A kind of mechanics parameter based on LC resonant transducer measures system, including DDS swept-frequency signal source module, high frequency merit
Rate amplifier module, the first phase shifter, the second phase shifter, Mutual Inductance Coupling front-end module, phase difference detection module, signal are adopted
Collection module, CPU；Mutual Inductance Coupling front-end module includes reading antenna and wireless and passive LC resonant transducer,
Therebetween by undesirable mutual electromagnetic inductance coupling composition Mutual Inductance Coupling front-end module；DDS swept signal source receives central authorities and processes single
After the digital frequency control word of unit, the test sinusoidal alternating source signal needed for generation system, this source signal is through radio frequency power amplifier
After module is amplified, it is possible to drive reading antenna to carry out undesirable mutual electromagnetic inductance with wireless and passive LC resonant transducer and couple；Second moves
The A port of phase difference detection module sent into by phase device after this source signal carries out phase shift process, this source signal is entered by the first phase shifter
Row phase shift sends into reading antenna after processing, it is ensured that the difference output under its stable state；The alternating signal after reading antenna is driven to send
Entering the B port of phase difference detection module, the phase difference value of both of the aforesaid signal is output as the direct current of correspondence by phase difference detection module
Level, the corresponding corresponding phase difference value of level magnitude, this output valve also characterizes the humorous of wireless and passive LC resonant transducer
Vibration frequency；DC level that signal acquisition module Real-time Collection phase difference detection module is exported also quantifies, and will quantify
After phase difference data transmission process to CPU, CPU receives the phase difference data after quantization
After, data are calculated, is calculated the resonant frequency of wireless and passive LC resonant transducer and the quick of test environment
Sense parameter, and result is exported in asynchronous serial mode.
Based on described measurement system measurement method, comprise the following steps:
1) wireless and passive LC resonant transducer is placed in test environment, by described reading antenna and wireless and passive LC
The inductance coil of resonant transducer is coaxial just to being placed in parallel；
2) after measuring system start-up, central processing unit controls DDS swept-frequency signal source module linear frequency sweep excitation is produced
Signal is after its driving force is amplified by high frequency power amplifier, and the first phase shifter of a road input to rear end is carried out
Phase shift sends to reading antenna after processing；The input of another road sends to phase difference detection mould to the shifted process of the second phase shifter
The A port of block；
3) through the pumping signal of reading antenna, due to Mutual Inductance Coupling, the pumping signal impedance characteristic of output signal occurs
Change, transfers to phase difference detection module to carry out phase difference value test the signal that this output signal and A port input, this difference
The phase difference value of two described signals is exported corresponding DC level by detection module, the corresponding corresponding phase place of level magnitude
Difference；
4) signal acquisition module Real-time Collection phase difference detection module is exported DC level also quantifies, and will quantify
After the transmission of phase difference data process to CPU；
5) after the phase difference data after CPU receives quantization, data are calculated, be calculated LC resonance
The resonant frequency of sensor and the sensitive parameter of test environment, and result is exported in asynchronous serial mode.
The Method for Phase Difference Measurement that the present invention proposes and the system of measurement, it is achieved small portable modularized design, easy for installation,
Measuring accuracy is high, and environment resistant interference performance is strong, well solves contactless LC resonant transducer and meets in test link
The key issue arrived.Main beneficial effect includes following three points:
1) present invention measures system and instead of traditional testing impedance instrument, simplifies and modularity sensor measuring system,
And breach the measurement being confined to laboratory, it is possible to apply to the aspect engineering surveys such as modern medical service, space flight and industry
In, and disclosure satisfy that and improve the requirement measured；
2) present invention measures system and utilizes non-contacting impedance phase measuring method to solve present in traditional measurement method
Hardware is difficult to, and precision is low, poor anti jamming capability and can not the problem such as use in extreme circumstances；
3) present invention measures system and solves the difficult problem under the adverse circumstances such as high temperature, high pressure, it is to avoid high temperature and high pressure environment
Lower wired measuring produces the problem such as circuit malfunction and electrical lead degeneration, important to having in the engineer applied such as space flight, nuclear power
Meaning.
Accompanying drawing explanation
Fig. 1 is LC resonant transducer cross high cumulant；
Fig. 2 is phase detection principle curve；
Fig. 3 is for measuring system structure schematic diagram；
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
It is to propose based on the coupling model shown in Fig. 1 that the LC resonant transducer mechanics parameter of the present invention measures system, its
Middle L1, R1, C1 are respectively reading antenna, the resistance of antenna and series capacitance, and L2, C2 are respectively sensor side
Inductance coil and the variable capacitance sensitive to mechanics parameter, R2 is to colonize in the series resistance in LC resonant tank.
When system applies sinusoidal alternating pumping signal U1 to front end reading antenna, if the LC resonance in far-end test environment
Sensor couples with reading antenna generation undesirable mutual electromagnetic inductance, and reading antenna end input impedance Zi will be caused to change, thus
The phase frequency curve making antenna end sinusoidal alternating pumping signal produces a peak relevant to LC resonant transducer resonant frequency
Value, as in figure 2 it is shown, by extracting the frequency at peak value, obtain the resonant frequency change of LC resonant transducer, so that it may
To extrapolate the change of tested mechanics parameter in environment.
The mechanics parameter based on LC resonant transducer of the present invention measures the structure of system as shown in Figure 3.This measurement system
Including DDS (direct digital frequency synthesis technology) swept-frequency signal source module, high-frequency power amplifier module, the first shifting
Phase device, the second phase shifter, Mutual Inductance Coupling front-end module, phase difference detection module, signal acquisition module, CPU.
Mutual Inductance Coupling front-end module includes reading antenna and wireless and passive LC resonant transducer, therebetween by undesirable mutual electromagnetic inductance coupling
It is combined into Mutual Inductance Coupling front-end module.After DDS swept signal source receives the digital frequency control word of CPU,
Test sinusoidal alternating source signal needed for generation system, this source signal, after high-frequency power amplification module amplifies, can drive reading
Take antenna to carry out undesirable mutual electromagnetic inductance with wireless and passive LC resonant transducer and couple；This source signal is carried out phase shift by the second phase shifter
Sending into the A port of phase difference detection module after process, this source signal is carried out feeding reading after phase shift process by the first phase shifter
Antenna, it is ensured that the difference output under its stable state；The alternating signal after reading antenna is driven to send into the B of phase difference detection module
Port, the phase difference value of both of the aforesaid signal is output as the DC level of correspondence by phase difference detection module, and level magnitude is corresponding
Corresponding phase difference value, this output valve also characterizes the resonant frequency of wireless and passive LC resonant transducer；Signals collecting mould
DC level that block Real-time Collection phase difference detection module is exported also quantifies, and the phase difference data after quantifying transmits extremely
CPU processes, and after CPU receives the phase difference data after quantization, calculates data,
It is calculated resonant frequency and the sensitive parameter of test environment of wireless and passive LC resonant transducer, and by result with different
Step serial mode output.
It is somebody's turn to do mechanics parameter based on LC resonant transducer and measures the method for testing of system, comprise the steps:
1) wireless and passive LC resonant transducer is placed in test environment, by the front end reading antenna in apparatus of the present invention with
The inductance coil of wireless and passive LC resonant transducer is coaxial just to being placed in parallel, now, and the resonance sensor in test environment
Device does not changes due to sensitive parameter, and institute's test value is Static output；
2) after measuring system start-up work, central processing unit controls DDS swept-frequency signal source module linear frequency sweep is produced
Pumping signal is after its driving force is amplified by high frequency power amplifier, and a road inputs the first phase shifter to rear end
After carrying out phase shift process, sending to reading antenna, this exciting signal frequency scope covers far-end LC sensor resonant frequency
Excursion, can drive the ability of reading antenna and the work of sensor Mutual Inductance Coupling after high frequency power amplifier；Another
Road input sends the A port to phase difference detection module to the shifted process of the second phase shifter.
3) through the pumping signal of reading antenna, due to Mutual Inductance Coupling, the pumping signal impedance characteristic of output signal occurs
Change, transfers to phase difference detection module to carry out phase difference value test the signal that this output signal and A port input, this difference
The phase difference value of both of the aforesaid signal can be exported corresponding DC level by detection module, the corresponding corresponding phase place of level magnitude
Difference；
4) signal acquisition module Real-time Collection phase difference detection module is exported DC level also quantifies, and will quantify
After the transmission of phase difference data process to CPU；
5), after the phase difference data after CPU receives quantization, data are calculated, is calculated LC humorous
The resonant frequency of vibration sensor and the sensitive parameter of test environment, and result is exported in asynchronous serial mode.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
And all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (2)
1. a mechanics parameter based on LC resonant transducer measures system, it is characterised in that include that DDS sweeps
Frequency source signal module, high-frequency power amplifier module, the first phase shifter, the second phase shifter, Mutual Inductance Coupling front-end module,
Phase difference detection module, signal acquisition module, CPU；Mutual Inductance Coupling front-end module includes reading antenna and wireless
Passive LC resonance sensor, therebetween by undesirable mutual electromagnetic inductance coupling composition Mutual Inductance Coupling front-end module；DDS frequency sweep is believed
Test sinusoidal alternating source letter after number source module receives the digital frequency control word of CPU, needed for generation system
Number, this source signal is after high-frequency power amplifier module amplifies, it is possible to drive reading antenna and wireless and passive LC resonance
Sensor carries out undesirable mutual electromagnetic inductance coupling；Second phase shifter sent into phase difference detection module after this source signal carries out phase shift process
A port, this source signal carries out sending into after phase shift process reading antenna by the first phase shifter, it is ensured that the difference under its stable state is defeated
Go out；Driving the alternating signal after reading antenna to send into the B port of phase difference detection module, phase difference detection module is by aforementioned two
The phase difference value of individual signal is output as the DC level of correspondence, the corresponding corresponding phase difference value of level magnitude, this level magnitude
Also the resonant frequency of wireless and passive LC resonant transducer is characterized；Signal acquisition module Real-time Collection phase difference detection module institute
The DC level of output also quantifies, and the phase difference data transmission after quantifying processes to CPU, in
After Central Processing Unit receives the phase difference data after quantization, data are calculated, be calculated wireless and passive LC resonance
The resonant frequency of sensor and the sensitive parameter of test environment, and result is exported in asynchronous serial mode.
2. based on the measurement system measurement method described in claim 1, it is characterised in that comprise the following steps:
1) wireless and passive LC resonant transducer is placed in test environment, by described reading antenna and wireless and passive LC
The inductance coil of resonant transducer is coaxial just to being placed in parallel；
2) after measuring system start-up, central processing unit controls DDS swept-frequency signal source module linear frequency sweep excitation is produced
Signal is after its driving force is amplified by high-frequency power amplifier module, and a road inputs the first phase shifter to rear end
Send to reading antenna after carrying out phase shift process；The input of another road sends to differing inspection to the shifted process of the second phase shifter
Survey the A port of module；
3) through the pumping signal of reading antenna, due to Mutual Inductance Coupling, the pumping signal impedance characteristic of output signal occurs
Change, transfers to phase difference detection module to carry out phase difference value test the signal that this output signal and A port input, this difference
The phase difference value of two described signals is exported corresponding DC level by detection module, the corresponding corresponding phase place of level magnitude
Difference；
4) signal acquisition module Real-time Collection phase difference detection module is exported DC level also quantifies, and will quantify
After the transmission of phase difference data process to CPU；
5) after the phase difference data after CPU receives quantization, data are calculated, be calculated LC resonance
The resonant frequency of sensor and the sensitive parameter of test environment, and result is exported in asynchronous serial mode.
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| CN106092193A (en) * | 2016-06-12 | 2016-11-09 | 上海航天设备制造总厂 | Wireless online mechanics and thermometry, device and application |
| CN106404210B (en) * | 2016-12-08 | 2023-10-20 | 广东中实源创科技有限公司 | Temperature measuring method and device and product using same |
| KR20200062667A (en) * | 2018-11-27 | 2020-06-04 | 삼성전자주식회사 | Living body information detecting apparatus |
| CN111829559B (en) * | 2020-06-24 | 2022-07-08 | 东南大学 | Method for realizing multi-parameter measurement of PT symmetrical LC passive wireless sensing system |
| CN112781758B (en) * | 2020-12-30 | 2022-03-08 | 北京航空航天大学 | Measurement device and measurement method for correcting force |
| CN113758505B (en) * | 2021-09-03 | 2022-08-30 | 东南大学 | PT symmetry-based LC passive wireless double-parameter sensing system |
| CN114136613B (en) * | 2021-10-20 | 2023-06-09 | 中国航发四川燃气涡轮研究院 | Monitoring system and online monitoring method for working state of engine bearing |
| CN114705227B (en) * | 2022-04-27 | 2023-12-19 | 东南大学 | LC three-parameter rapid measurement circuit based on FFT |
| CN117517783A (en) * | 2024-01-02 | 2024-02-06 | 成都迅翼卫通科技有限公司 | Single-port impedance detection device and method and electronic equipment |
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| WO2013157979A1 (en) * | 2012-04-19 | 2013-10-24 | Общество С Ограниченной Ответственностью "Энергосервис 2.0" | System for remote measurement and monitoring of physical magnitudes and method for remote measurement and monitoring of physical magnitudes |
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