CN102944340B - Charge-voltage converter for piezoelectric intelligent aggregate seismic damage monitoring system - Google Patents
Charge-voltage converter for piezoelectric intelligent aggregate seismic damage monitoring system Download PDFInfo
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- CN102944340B CN102944340B CN201210447447.4A CN201210447447A CN102944340B CN 102944340 B CN102944340 B CN 102944340B CN 201210447447 A CN201210447447 A CN 201210447447A CN 102944340 B CN102944340 B CN 102944340B
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Abstract
The invention provides a charge-voltage converter for a piezoelectric intelligent aggregate seismic damage monitoring system. The charge-voltage converter is formed by connecting a plurality of integrated circuit plates in parallel. Each integrated circuit plate comprises a signal source amplifying unit, a control unit, a gain display unit and a power supplying unit, wherein the signal source amplifying unit is formed by sequentially connecting a charge-voltage conversion circuit, a controllable gain amplifying circuit, a controllable filter circuit, a low-pass filter circuit, a high-pass filter circuit and a voltage ejection follower; the gain display unit comprises an electronic switch and a gain indicator light circuit; the control unit is respectively connected with an ejection follower output end, the controllable gain amplifying circuit, the controllable filter circuit, the electronic switch and a computer signal acquisition system, and is used for monitoring an output signal, controlling voltage gain and gain display and controlling the filter cutoff frequency; and the output voltage and the corresponding gain value are sent to a computer data acquisition system through an interface to display. The charge-voltage converter has the advantages of being capable of simultaneously acquiring multi-path of signals, reliably monitoring the concrete structure dynamic damage in seismic processes with different intensities; and the charge-voltage converter is simple in construction and stable in performance.
Description
Technical field
The present invention relates to a kind of hyperchannel for piezoelectric intelligent aggregate Health Monitoring system, large charge amount, variable gain charge voltage converter, especially can carry out the charge data collection in the monitoring of inside concrete whole dynamic damage process.
Background technology
Under geological process xoncrete structure internal stress monitoring for understanding structural damage mechanism, the seismic design of optimizing structure, reducing structural earthquake, to destroy risk significant.It is matrix and the coupling of PZT sheet that piezoelectric intelligent aggregate adopts concrete coarse aggregate material, utilizes direct piezo electric effect to carry out structure dynamic stress monitoring, and its monitoring effect depends on the conditioning of secondary instrument to monitor signal to a great extent.The electric charge of the upper generation of PZT need to, by special device translates energy voltage signal, just can carry out data acquisition.
Because the quantity of electric charge producing on PZT sheet under geological process is larger, be prone to overload phenomenon if adopt existing commercial charge amplifier to carry out charge voltage conversion, and cause monitoring; For soft building structure, its vibration frequency is very low, and conventionally less than 0.2Hz, common charge amplifier time constant is lower, cannot accurately change such low frequency signal; Under earthquake input for varying strength, the quantity of electric charge difference of the upper generation of PZT, the charge amplifier of modulation use should use gain correspondingly.Due to the uncertainty of earthquake motion input intensity and frequency, common charge amplifier cannot base area vibrations input be adjusted gain and cutoff frequency automatically, thereby can not meet the accuracy requirement of multiple dimensioned measurement.Therefore carry out for convenience the monitoring of concrete building structures earthquake response, be necessary the charge voltage converter of development and Design hyperchannel, the high quantity of electric charge, variable gain.
Summary of the invention
The invention provides a kind of charge voltage converter for piezoelectric intelligent aggregate Health Monitoring system, this invention has solved the problems referred to above effectively, and stable performance, can apply in seismic Damage process monitoring field large-scale popularization.
The present invention utilizes the piezoelectric effect principle of PZT to gather electric charge, through charge amplifier, charge signal is converted to voltage signal, utilize suitable feedback capacity to meet the collection requirement of large charge amount under piezoelectric intelligent aggregate strong earthquakes, and utilize microprocessor controls voltage gain able to programme, filtering circuit cutoff frequency monitoring to transship, utilize multi-channel assembled structure to meet the requirement of simultaneously observing multiple signals, output signal and corresponding gain control value input data acquisition system (DAS), for xoncrete structure seismic Damage Mechanism Study provides reliable and effective monitoring means.
Technical scheme of the present invention is as follows:
For a charge voltage converter for piezoelectric intelligent aggregate Health Monitoring system, this converter forms by multiple surface-mounted integrated circuits are parallel, is connected with piezoelectric sensor output terminal, and sensor multiple signals are carried out to Real-time Collection.
Each surface-mounted integrated circuit comprises an information source amplifying unit, a control module, a gain display unit and a power supply unit; Wherein information source amplifying unit comprises charge voltage change-over circuit, controllable gain amplifying circuit, controlled filtering circuit, low-pass filter circuit, high-pass filtering circuit and voltage emitter follower, and each several part is connected successively; Gain display unit is made up of electronic switch and gain indicator light circuit; Control module is connected with emitter follower output terminal, controllable gain amplifying circuit, controlled filtering circuit, electronic switch, zoophysiology respectively; The feedback capacity value of charge voltage change-over circuit is set according to the electric charge maximal value under strong earthquakes; Control module is used for feedback amplitude and the frequency of comparison output signal, and sends control signal; The reception control signal of controllable gain amplifying circuit, regulates corresponding gain amplifier automatically; Electronic switch in gain indicating member is accepted control signal, selects to show corresponding gain; After controlled filtering circuit reception control signal, automatically regulate filtering cutoff frequency; Gain control value exports in computer data acquisition system in real time by interface, shows output voltage and corresponding yield value.
Beneficial effect of the present invention:
1. by multi-channel assembled structure, meet the demand of simultaneously observing multiple signals input in seismic process.
2. by the control of microcontroller, the electric signal of different amplitudes is regulated to gain automatically, thereby be applicable to the geological process monitoring to varying strength.
3. simple structure, stable performance, can connect long cable and not affect measuring accuracy, is applicable to the widespread use of piezoelectric damage process monitoring.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is control module circuit diagram of the present invention.
Fig. 3 is gain display unit circuit figure of the present invention.
In figure: 1 information source amplifying unit; 2 charge voltage change-over circuits; 3 controllable gain amplifying circuits; 4 controlled filtering circuits; 5 low-pass filter circuits; 6 high-pass filtering circuits; 7 voltage emitter followers; 8 control modules; 9 gain display units; 10 electronic switches; 11 gain indicator light circuits; 12 power supply units; 13 zoophysiologies.
Embodiment
Describe specific embodiments of the invention in detail below in conjunction with technical scheme and accompanying drawing.
As Figure 1-3, its structure comprises information source amplifying unit 1, control module 8, gain display unit 9 and power supply unit 12.Wherein information source amplification module forms by six grades: charge voltage change-over circuit 2, controllable gain amplifying circuit 3, controlled filtering circuit 4, low pass active filter circuit 5, high-pass filtering circuit 6, voltage emitter follower 7 are connected successively, and control module 8 is connected with emitter follower 7, controllable gain amplifying circuit 3, controlled filtering circuit 4, electronic switch 10 respectively.Feed circuit 12 provide suitable voltage for each circuit module.
The first order charge voltage change-over circuit of information source amplification module is resistance, feedback capacity C
fthe compositions such as=5 μ F and FET operational amplifier A D820, the charge signal Q that input is produced by piezoceramic transducer is converted to voltage signal U
1, wherein U
1=Q/C
f; The main chip of second level controllable gain amplifying circuit is AD8253, and it has four gain level.Microcontroller C8051F300 is according to comparing MAX port output signal U
maxamplitude, sends the A1A0 signal controlling AD8253 switching that gains, and the amplitude of output signal is controlled in suitable observation scope, and the output voltage of the first order is amplified respectively through AD8253, i.e. U
2=A*U
1, the gain amplifier that wherein A is AD8253, in the time that control signal A1A0 is 00,01,10,11, A is respectively 1,10,100,1000; The main chip of the 3rd extremely controlled filtering circuit 3 is eight rank ellipse switching capacity filter MAX293, and it contains 11 grades of corner frequencies.Microcontroller C8051F300 is according to the output U of MAX port
maxsignal frequency, produces independently clock CLK and provides cutoff frequency for MAX293; The fourth stage and level V are respectively second order butterworth filter and Hi-pass filter.The voltage signal being amplified by the second level is through third and fourth, after the bandpass filter that forms of Pyatyi, and a road is through OUT port output U
out, another road, after two step voltage emitter followers amplify, provides signal by MAX port for microcontroller C8051F300.
Gain display unit is mainly made up of electronic switch CD4052, electric group, four light emitting diodes, four triodes 8050 etc.The control signal A1A0 that CD4052 sends according to microcontroller C8051F300, light corresponding gain pilot lamp, the record of being convenient to data is all provide ± 6V of the active chip of information source amplification module voltage with measuring power supply unit, for control module and all provide+3.3V of CD4052 voltage, be provide+6V of gain display circuit voltage.
The electric charge that this charge voltage converter produces piezoelectric intelligent aggregate is converted into voltage signal, and passes through corresponding signal acquiring system by voltage signal U
outdeposit in computing machine and process with corresponding gain amplifier value A, thereby can realize, concrete structure power damage in seismic process is monitored accurately and reliably.
Claims (1)
1. the charge voltage converter for piezoelectric intelligent aggregate Health Monitoring system, it is characterized in that: this converter forms by multiple surface-mounted integrated circuits are parallel, and each surface-mounted integrated circuit comprises an information source amplifying unit (1), a control module (8), a gain display unit (9) and a power supply unit (12); Wherein information source amplifying unit comprises charge voltage change-over circuit (2), controllable gain amplifying circuit (3), controlled filtering circuit (4), low-pass filter circuit (5), high-pass filtering circuit (6) and voltage emitter follower (7), and each several part is connected successively; Gain display unit (9) is made up of electronic switch (10) and gain indicator light circuit (11); Control module (8) is connected with output terminal, controllable gain amplifying circuit (3), controlled filtering circuit (4), electronic switch (10), the zoophysiology (13) of voltage emitter follower (7) respectively; The feedback capacity value of charge voltage change-over circuit (2) is set according to the electric charge maximal value under strong earthquakes; Control module (8) is for feedback amplitude and the frequency of comparison output signal, and sends control signal; The reception control signal of controllable gain amplifying circuit (3), regulates corresponding gain amplifier automatically; Analog selection electronic switch in gain indicating member is accepted control signal, selects to show corresponding gain; After controlled filtering circuit (4) reception control signal, automatically regulate filtering cutoff frequency; Gain control value exports in computer data acquisition system in real time by interface, shows output voltage and corresponding yield value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210447447.4A CN102944340B (en) | 2012-11-10 | 2012-11-10 | Charge-voltage converter for piezoelectric intelligent aggregate seismic damage monitoring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210447447.4A CN102944340B (en) | 2012-11-10 | 2012-11-10 | Charge-voltage converter for piezoelectric intelligent aggregate seismic damage monitoring system |
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| Publication Number | Publication Date |
|---|---|
| CN102944340A CN102944340A (en) | 2013-02-27 |
| CN102944340B true CN102944340B (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210447447.4A Expired - Fee Related CN102944340B (en) | 2012-11-10 | 2012-11-10 | Charge-voltage converter for piezoelectric intelligent aggregate seismic damage monitoring system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103837886A (en) * | 2014-03-27 | 2014-06-04 | 江苏三川智能科技有限公司 | Earthquake and rockburst locating method based on piezoelectric intelligent aggregates |
| CN108896389A (en) * | 2018-07-17 | 2018-11-27 | 北华大学 | A kind of damages of concrete structures monitoring method based on piezoelectric intelligent aggregate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0379804B1 (en) * | 1988-12-29 | 1994-05-25 | Atlantic Richfield Company | Transient electromagnetic apparatus for detecting irregularities on conductive containers |
| CN101216443A (en) * | 2008-01-02 | 2008-07-09 | 沈阳建筑大学 | Piezoelectric intelligent aggregate for civil engineering works structure health monitoring |
| CN101493355A (en) * | 2009-02-18 | 2009-07-29 | 长沙全程数字机电科技有限公司 | Integration oscillation monitoring instrument |
| CN202836838U (en) * | 2012-11-10 | 2013-03-27 | 大连理工大学 | Charge voltage converter for piezoelectric intelligent aggregate quake damage monitoring system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH102915A (en) * | 1996-06-13 | 1998-01-06 | Mitsubishi Electric Corp | Semiconductor sensor |
-
2012
- 2012-11-10 CN CN201210447447.4A patent/CN102944340B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0379804B1 (en) * | 1988-12-29 | 1994-05-25 | Atlantic Richfield Company | Transient electromagnetic apparatus for detecting irregularities on conductive containers |
| CN101216443A (en) * | 2008-01-02 | 2008-07-09 | 沈阳建筑大学 | Piezoelectric intelligent aggregate for civil engineering works structure health monitoring |
| CN101493355A (en) * | 2009-02-18 | 2009-07-29 | 长沙全程数字机电科技有限公司 | Integration oscillation monitoring instrument |
| CN202836838U (en) * | 2012-11-10 | 2013-03-27 | 大连理工大学 | Charge voltage converter for piezoelectric intelligent aggregate quake damage monitoring system |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平10-2915 1998.01.06 |
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Granted publication date: 20140723 Termination date: 20181110 |