CN202442724U - Diagnostic device of piezoelectric sensor system - Google Patents
Diagnostic device of piezoelectric sensor system Download PDFInfo
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- CN202442724U CN202442724U CN2011204742248U CN201120474224U CN202442724U CN 202442724 U CN202442724 U CN 202442724U CN 2011204742248 U CN2011204742248 U CN 2011204742248U CN 201120474224 U CN201120474224 U CN 201120474224U CN 202442724 U CN202442724 U CN 202442724U
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- piezoelectric sensor
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- pumping signal
- diagnostic device
- charge amplifier
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Abstract
The utility model provides a diagnostic device of a piezoelectric sensor system. The diagnostic device includes a to-be-detected electronic part, an excitation signal source which generates an excitation signal having a certain frequency or amplitude, and a microprocessor. The microprocessor includes an excitation signal giving module which provides a given excitation signal for the excitation signal source and an excitation signal comparison module which compares the given excitation signal with an excitation signal fed back by the to-be-detected electronic part. The excitation signal giving module of the microprocessor, the excitation signal source, the to-be-detected electronic part, and the excitation signal comparison module of the microprocessor are connected in order along the flow direction of the excitation signal. Through adopting the above configuration, the on-line test of a signal processing circuit of the piezoelectric sensor system can be carried out without dismounting a vortex flowmeter to a laboratory periodically for detection, so the time and the cost are greatly saved.
Description
Technical field
The utility model relates to the diagnostic device of piezoelectric sensor systems, more precisely is, comprises the diagnostic device of the piezoelectric sensor systems of feedback circuit.
Background technology
Piezoelectric sensor is widely used in every field, and one of them application is exactly in vortex shedding flow meter.The fault of piezoelectric sensor, line or its signal processing circuit possibly cause the inaccuracy measured, even causes the vortex shedding flow meter cisco unity malfunction.In order to ensure the normal condition of piezoelectric sensor, line or its signal processing circuit, need periodically these devices to be tested.As a rule, the equipment of other standards need be perhaps adopted in the test of these devices in the laboratory.This just requires to dismantle vortex street amount meter, interrupts the whole production flow process temporarily.Especially, in some long-range application, the flow process of test will be suitable consuming time and difficult.Though similarly the diagnostic method of piezoelectric sensor proposes (U.S.Pat.Nos.6; 531; 884); But this method receives the constraint (for example, requiring signal source to have low output resistance and line that extremely low leakage resistance is arranged) of some key parameters, only when other circuit and device are in proper working order, just can detect the fault of piezoelectric sensor.Therefore, this method can not be discerned the concrete source of trouble under piezoelectric sensor, line or the abnormal situation of its signal processing circuit.
The utility model content
To above-mentioned technical matters, the utility model provides a kind of diagnostic device of piezoelectric sensor systems, and this piezoelectric sensor systems comprises electronic unit to be detected, produces the exciting signal source and the microprocessor of the pumping signal with CF or amplitude; Processor comprises: provide the given module of pumping signal of given pumping signal and the pumping signal of the pumping signal of more given pumping signal and electronic unit to be detected feedback to compare module to exciting signal source; Wherein: prolong the flow direction of pumping signal, the given module of the pumping signal of microprocessor, exciting signal source, electronic unit to be detected and the pumping signal comparison module of microprocessor are connected successively.Through adopting above-mentioned configuration, online signal processing circuit to piezoelectric sensor systems is tested, and does not need periodically to dismantle vortex shedding flow meter, is transferred to the laboratory to it and detects.This is with big time saver and cost.
Description of drawings
Fig. 1 illustrates the diagnostic device according to the piezoelectric sensor systems of an embodiment of the utility model;
Fig. 2 illustrates the diagnostic device according to the piezoelectric sensor systems of another embodiment of the utility model;
Fig. 3 illustrates the diagnostic device according to the piezoelectric sensor systems of another embodiment of the utility model; With
Fig. 4 illustrates the diagnostic device according to the piezoelectric sensor systems of another embodiment of the utility model.
Embodiment
In general, the fault of piezoelectric sensor has open circuit, short circuit, degeneration.In utility model, all sources of trouble relevant with piezoelectric sensor and signal processing circuit thereof are considered to be the same source of trouble, i.e. fault.Cable maybe be by some mechanical actions damages in the time of owing to some, the for example mechanical vibration of cable and bending, thus cause broken cable or short circuit.So open circuit and short circuit are considered to two kinds of malfunctions of cable.In practical operation, short circuit sensor still is cable or signal processing circuit short circuit when being difficult to distinguish, and open sensor still is cable or signal processing circuit open circuit when in like manner also being difficult to distinguish.The state of cable, sensor and signal processing circuit is considered to the state of single device.
Fig. 1 illustrates the diagnostic device according to the piezoelectric sensor systems of an embodiment of the utility model.As shown in Figure 1, the diagnostic device of piezoelectric sensor systems comprises: the exciting signal source 10, signal processing circuit 19 and the microprocessor 20 that produce the pumping signal with CF or amplitude; Microprocessor 20 comprises to exciting signal source 10 provides the given module of pumping signal of given pumping signal and the pumping signal of the pumping signal of more given pumping signal and electronic unit to be detected feedback to compare module; The signal processing circuit 19 of piezoelectric sensor is an electronic unit to be detected, and it comprises: charge amplifier 22, adjustable gain operational amplifier 23, low-pass filter 24, digital to analog converter 25 and buffer circuit 26; Prolong the flow direction of pumping signal, the pumping signal comparison module of the given module of the pumping signal of microprocessor 20, exciting signal source 10, signal processing circuit 19 and microprocessor 20 is connected successively.
Wherein the in-phase end of charge amplifier 22 also can pass through the parallelly connected ground connection with electric capacity of resistance through balance resistance 21 ground connection, perhaps direct ground connection.Physical circuit depends on that physical circuit design, purpose are that the impedance that lets homophase and two input ends of anti-phase see away equates, the pressure drop that makes the bias current of two input ends on them, produce is also equal, plays the effect of cancelling out each other.
Charge amplifier can adopt homophase to amplify, and also can adopt anti-phase to amplify, and promptly the in-phase end of last figure and end of oppisite phase can exchange.Physical circuit depends on the physical circuit design.As far as in-phase amplification circuit, advantage is enough big input impedance, and is more suitable for the circuit that output impedance is very big; Shortcoming is that amplifying circuit does not have " virtual earth ", and antijamming capability is relatively poor relatively.As far as reverse amplification circuit, advantage is an in-phase end ground connection, end of oppisite phase " virtual earth ", and antijamming capability is strong; Shortcoming is that input impedance is very little, is not suitable for the very big occasion of front stage circuits output impedance.
The given pumping signal that exciting signal source 10 is provided can be random waveform AC signal (for example; Square wave; Sinusoidal wave), the amplitude of the given pumping signal that is provided such as exciting signal source 10 or more than the twice of the working signal that frequency is piezoelectric sensor or frequency.) therefore, when handling given pumping signal, can ignore the working signal of piezoelectric sensor, and then judge the state of signal processing circuit according to given pumping signal and feedback thereof.
According to the instruction of the given module of pumping signal of microprocessor 20, the given pumping signal of exciting signal source 10 outputs.Given pumping signal compares module through the pumping signal that signal processing circuit 19 (electronic unit to be detected) feeds back to microprocessor 20; Through comparing the attribute of feedback signal and given pumping signal, microprocessor 20 can obtain the state of circuit.If the attribute of response signal and pumping signal is different, microprocessor 20 report signal treatment circuit faults then; Otherwise circuit working is in normal condition.Such as; If signal processing circuit open circuit; The amplitude or the frequency component that then do not have given pumping signal in the feedback signal; The more given pumping signal of pumping signal comparison module of microprocessor 20 and do not contain the amplitude of given pumping signal or the feedback signal of frequency component obtains the fault of signal processing circuit open circuit.
Through adopting above-mentioned configuration, online signal processing circuit to piezoelectric sensor systems is tested, and does not need periodically to dismantle vortex shedding flow meter, is transferred to the laboratory to it and detects.This is with big time saver and cost.
Preferably, between exciting signal source 10 and signal processing circuit 19, add capacitance C
T111, be used to filter the working signal of the piezoelectric sensor of low frequency.
Fig. 2 illustrates the diagnostic device according to the piezoelectric sensor systems of another embodiment of the utility model.As shown in Figure 2; The diagnostic device of piezoelectric sensor systems comprises: produce exciting signal source 10, piezoelectric sensor 13, signal processing circuit 19 and the microprocessor 20 of the pumping signal with CF or amplitude, wherein piezoelectric sensor 13 is an electronic unit to be detected.Microprocessor 20 comprises to exciting signal source 10 provides the given module of pumping signal of given pumping signal and the pumping signal of the pumping signal of more given pumping signal and electronic unit to be detected feedback to compare module; Signal processing circuit 19 comprises: charge amplifier 22, adjustable gain operational amplifier 23, low-pass filter 24, digital to analog converter 25 and buffer circuit 26; Prolong the flow direction of pumping signal, the pumping signal comparison module of the given module of the pumping signal of microprocessor 20, exciting signal source 10, piezoelectric sensor 13, signal processing circuit 19 and microprocessor 20 is connected successively.Piezoelectric sensor 13 and 8 couplings of simulation ground.The cable 14 that is used to connect piezoelectric sensor 13 can equivalence be leakage resistance R
c15 with the cable capacitor C
c16 parallel connections.
The given pumping signal that exciting signal source 10 is provided can be random waveform AC signal (for example; Square wave; Sinusoidal wave); But its amplitude or frequency significantly are different from the working signal of piezoelectric sensor, more than the twice of the amplitude of the given pumping signal that is provided such as exciting signal source 10 or the amplitude of the working signal that frequency is piezoelectric sensor or frequency.Therefore, when handling given pumping signal, can ignore the working signal of piezoelectric sensor, and then judge the state of signal processing circuit according to given pumping signal and feedback thereof.Wherein the in-phase end of charge amplifier 22 also can pass through the parallelly connected ground connection with electric capacity of resistance through balance resistance 21 ground connection, perhaps direct ground connection.Physical circuit depends on that physical circuit design, purpose are that the impedance that lets homophase and two input ends of anti-phase see away equates, the pressure drop that makes the bias current of two input ends on them, produce is also equal, plays the effect of cancelling out each other.
According to the instruction of the given module of pumping signal of microprocessor 20, the given pumping signal of exciting signal source 10 outputs.Given pumping signal compares module through the pumping signal that piezoelectric sensor 13 (electronic unit to be detected) and signal processing circuit 19 feed back to microprocessor 20; Through comparing the attribute of feedback signal and given pumping signal, microprocessor 20 can obtain the state of circuit.Specifically, the response signal that obtains from piezoelectric sensor 13 is imported into the input port 30 of signal processing circuit 19.Microprocessor 20 can dispose exciting signal source generation pumping signal and pumping signal is loaded on the piezoelectric sensor 13; Receive and detect the data that obtain from signal processing circuit 19 again; Piezoelectric sensor 13 is provided at last, cable 14, the diagnostic state output of signal processing circuit 19.At the piezoelectric sensor open circuit, under short circuit and the normal condition, the intensity of feedback signal is different.During short circuit, almost do not have feedback signal and be input to charge amplifier, almost nil; During open circuit, the feedback signal amplitude is the strongest; Just often, the feedback signal amplitude is between short circuit and open circuit.The diagnostic method of in microprocessor 20, carrying out can be simple threshold ratio, perhaps more complicated signal processing algorithm (for example, finite impulse response filtering, discrete Fourier transformation).
Through adopting above-mentioned configuration, online piezoelectric sensor to piezoelectric sensor systems is tested, and does not need periodically to dismantle vortex shedding flow meter, is transferred to the laboratory to it and detects.This is with big time saver and cost.
Preferably, between exciting signal source 10 and signal processing circuit 19, add capacitance C
T111, be used to filter the working signal of the piezoelectric sensor of low frequency.
Fig. 3 illustrates the diagnostic device according to the piezoelectric sensor systems of another embodiment of the utility model.As shown in Figure 3; The diagnostic device of piezoelectric sensor systems comprises: produce exciting signal source 10, piezoelectric sensor 13, signal processing circuit 19 and the microprocessor 20 of the pumping signal with CF or amplitude, wherein piezoelectric sensor 13 is an electronic unit to be detected.Microprocessor 20 comprises to exciting signal source 10 provides the given module of pumping signal of given pumping signal and the pumping signal of the pumping signal of more given pumping signal and electronic unit to be detected feedback to compare module; Signal processing circuit 19 comprises: charge amplifier 22, adjustable gain operational amplifier 23, low-pass filter 24, digital to analog converter 25 and buffer circuit 26; Prolong the flow direction of pumping signal, the pumping signal comparison module of the given module of the pumping signal of microprocessor 20, exciting signal source 10, piezoelectric sensor 13, signal processing circuit 19 and microprocessor 20 is connected successively.Piezoelectric sensor 13 is coupled through resistance 27 with simulation ground 8.The cable 14 that is used to connect piezoelectric sensor 13 can equivalence be leakage resistance R
c15 with the cable capacitor C
c16 parallel connections.Wherein the in-phase end of charge amplifier 22 also can pass through the parallelly connected ground connection with electric capacity of resistance through balance resistance 21 ground connection, perhaps direct ground connection.Physical circuit depends on that physical circuit design, purpose are that the impedance that lets homophase and two input ends of anti-phase see away equates, the pressure drop that makes the bias current of two input ends on them, produce is also equal, plays the effect of cancelling out each other.
The given pumping signal that exciting signal source 10 is provided can be random waveform AC signal (for example; Square wave; Sinusoidal wave); But its amplitude or frequency significantly are different from the working signal of piezoelectric sensor, more than the twice of the amplitude of the given pumping signal that is provided such as exciting signal source 10 or the amplitude of the working signal that frequency is piezoelectric sensor or frequency.Therefore, when handling given pumping signal, can ignore the working signal of piezoelectric sensor, and then judge the state of signal processing circuit according to given pumping signal and feedback thereof.
According to the instruction of the given module of pumping signal of microprocessor 20, the given pumping signal of exciting signal source 10 outputs.Given pumping signal compares module through the pumping signal that piezoelectric sensor 13 (electronic unit to be detected) and signal processing circuit 19 feed back to microprocessor 20; Through comparing the attribute of feedback signal and given pumping signal, microprocessor 20 can obtain the state of circuit.Specifically, the response signal that obtains from piezoelectric sensor 13 is imported into the input port 30 of signal processing circuit 19.Microprocessor 20 can dispose exciting signal source generation pumping signal and pumping signal is loaded on the piezoelectric sensor 13; Receive and detect the data that obtain from signal processing circuit 19 again; Piezoelectric sensor 13 is provided at last, cable 14, the diagnostic state output of signal processing circuit 19.At piezoelectric sensor 13 open circuits, under short circuit and the normal condition, the intensity of feedback signal is different.Short circuit and normal condition, the feedback signal amplitude is different, depends on concrete circuit design.Usually during short circuit, amplitude is bigger this moment; During open circuit, no feedback signal is input to charge amplifier 22.The diagnostic method of in microprocessor 20, carrying out can be simple threshold ratio, perhaps more complicated signal processing algorithm (for example, finite impulse response filtering, discrete Fourier transformation).
Through adopting above-mentioned configuration, online piezoelectric sensor to piezoelectric sensor systems is tested, and does not need periodically to dismantle vortex shedding flow meter, is transferred to the laboratory to it and detects.This is with big time saver and cost.
Preferably, between exciting signal source 10 and signal processing circuit 19, add capacitance C
T111, be used to filter the working signal of the piezoelectric sensor of low frequency.
Fig. 4 illustrates the diagnostic device according to the piezoelectric sensor systems of another embodiment of the utility model.The piezoelectric sensor systems of embodiment as shown in Figure 4 comprises: piezoelectric sensor 13, signal processing circuit 19, microprocessor 20, exciting signal source 10 and some other resistance and electric capacity are formed.Exciting signal source 10 (i.e. signal generating element) has three outputs that can independently control, respectively at three testing capacitor C
T111, C
T212 and C
T313 link to each other one to one.Exciting signal source 10 must be able to receive the control of the given module of pumping signal of microprocessor 20, thereby provides specific frequency signal to arrive each delivery outlet.The signal that exciting signal source 10 produces can be the AC signal (for example, square wave, sine wave) of random waveform.Testing capacitor C
T1Be coupled in series between first delivery outlet and signal processing circuit 19 input ports 30 of exciting signal source 10.Testing capacitor C
T2Be coupled in series between second delivery outlet and signal processing circuit 19 input ports 31 of exciting signal source 10.Testing capacitor C
T3Be coupled in series between the 3rd delivery outlet and signal processing circuit 19 input ports 32 of exciting signal source 10.Piezoelectric sensor 13 is through a switch 17 and 8 couplings of simulation ground.Switch 17 can be opened or closure depends on different diagnostic modes.The detailed utilization of switch 17 will be in next paragraph discussion.The cable 14 that is used to connect piezoelectric sensor 13 can equivalence be a leakage resistance R
c15 and cable capacitor C
c16 parallel connections.The response signal that obtains from piezoelectric sensor 13 is imported into the input port 30 of signal processing circuit 19.Signal processing circuit 19 can comprise, but is not limited to, operational amplifier, wave filter, analog to digital converter and isolating device.Microprocessor 20 can dispose exciting signal source generation pumping signal and pumping signal is loaded on the piezoelectric sensor 13; Receive and detect the data that obtain from signal processing circuit 19 again; Piezoelectric sensor 13 is provided at last, cable 14, the diagnostic state output of signal processing circuit 19.The diagnostic method of in the pumping signal comparison module of microprocessor 20, carrying out can be simple threshold ratio, perhaps more complicated signal processing algorithm (for example, finite impulse response filtering, discrete Fourier transformation).
The diagnostic device of the piezoelectric sensor systems of embodiment shown in Figure 4 can all sources of trouble relevant with piezoelectric sensor and signal processing circuit thereof of comprehensive diagnos.In practical operation, still be the signal processing circuit short circuit but the distinguishing sensor short circuit still is the cable short circuit, and when distinguishing open sensor still be the cable open circuit still signal processing circuit open a way.
The diagnostic device of the piezoelectric sensor systems of embodiment shown in Figure 4 has three kinds of different patterns.When it is in Mode A, the diagnostic device Closing Switch 17 of piezoelectric sensor systems.Exciting signal source 10 is configured to second delivery outlet, the 2 output drive signals from it.Response signal is 31 inputs from the input port.Through comparing the attribute (for example amplitude or frequency) of response signal and pumping signal, the pumping signal comparison module of microprocessor 20 can obtain the state of circuit.If the attribute of response signal and pumping signal is different, diagnostic device report signal treatment circuit 19 faults stop diagnostic procedure then.Otherwise signal processing circuit 19 is operated in normal condition, and diagnostic device switches to Mode B.
If signal processing circuit 19 is operated in normal condition, diagnostic device switches to Mode B.Closing Switch 17, the given module instruction exciting signal source 10 output drive signals of pumping signal of microprocessor 20 are to first delivery outlet 1 of exciting signal source 10 simultaneously.Because the amplitude of response signal is relevant with piezoelectric capacitance and testing capacitor, and the appearance value substantially constant of normal condition lower piezoelectric electric capacity and testing capacitor, so the amplitude of response signal is only relevant with the amplitude of pumping signal, with the frequency-independent of pumping signal.If the aging appearance value of piezoelectric capacitance that will cause of piezoelectric sensor changes usually.If so press piezoelectric sensor aging, correspondingly, the amplitude of the response signal that obtains from piezoelectric sensor 13 also can be along with variation.The degree that piezoelectric sensor is aging can be judged through the amplitude of response signal.If piezoelectric sensor 13 or cable 14 are in short-circuit condition, diagnostic device will be from the input port 30 can not get any response signal.The pumping signal of microprocessor 20 relatively module compares the attribute of response signal and pumping signal, and judges the state of piezoelectric sensor and cable.If the amplitude of response signal is lower than predetermined normality threshold, diagnostic device will be reported the sensor degradation failure.The signal if diagnostic device does not meet with a response, then diagnostic device will be reported sensor or cable short trouble.
If diagnostic device determine sensor state is normal, then diagnostic device switches to pattern C.Cut off switch 17, the given module instruction exciting signal source 10 output drive signals of pumping signal of microprocessor 20 are to the 3rd delivery outlet 3 of exciting signal source 10 simultaneously.If there is not response signal to be input to input port 30, diagnostic device will be reported sensor or cable open fault.
The vortex shedding flow meter front end-plate 30 that comprises diagnostic device.Under normal condition, the piezoelectric signal that piezoelectric sensor 13 produces is imported into the end of oppisite phase of charge amplifier 22, then through adjustable gain amplifier 23, and low-pass filter 24, analog to digital converter 25, buffer circuit 26 is handled in microprocessor 20 at last.Under diagnostic state, front end-plate 30 has been set up the loop of an OBD.The given module instruction exciting signal source 10 of the pumping signal of microprocessor 20 produces pumping signal.Pumping signal is loaded on the input end and piezoelectric sensor 13 of electric charge operational amplifier 22.The response signal of then coming from the piezoelectric sensor feedback compares module through the pumping signal that signal processing circuit 19 gets into microprocessor 20.The pumping signal comparison module of last microprocessor 20 receives the response signal that obtains from signal processing circuit 19 and handles.
The front end-plate 30 of vortex shedding flow meter contains the diagnostic device of promising piezoelectric sensor and relevant line and signal processing circuit.Testing capacitor C
T1Be coupled in series between the inverting input of first delivery outlet and charge amplifier 22 of exciting signal source 10.Testing capacitor C
T2Be coupled in series between the in-phase input end of second delivery outlet and charge amplifier 22 of exciting signal source 10.When implementing diagnosis, the response signal of piezoelectric sensor 13 must suppress enough little, the state in order to avoid charge amplifier reaches capacity.The amplitude of this response signal can be adjusted through the amplitude of change pumping signal and the appearance value of testing capacitor.The in-phase input end of electric charge operational amplifier 22 joins through resistance 21 and simulation ground 8.Signal processing circuit 19 is by charge amplifier 22, programmable gain amplifier 23, and low-pass filter 24, analog to digital converter 25 is formed with buffer circuit 26.Microprocessor 20 can with the communicating by letter of other devices or equipment.In case diagnosis is accomplished, microprocessor 20 Closing Switch 17 make front end-plate 30 be operated in normal operating condition.At this moment, microprocessor 20 obtains the state of piezoelectric sensor and relevant line and circuit.Especially, the degree of aging of piezoelectric sensor is also differentiated out.This just can be used for judging whether needing replacement or compensation piezoelectric sensor 13.In actual application, diagnostic operation is provided with microprocessor 30 and carries out according to predetermined condition (for example, internal counter or external command) is periodic.
Though some preferred embodiment with reference to the utility model illustrates and has described the utility model; But it will be appreciated by those skilled in the art that; Under the situation of spirit that does not deviate from the utility model that limits appended claims and scope, can make various variations to it in form with on the details.
Claims (13)
1. the diagnostic device of a piezoelectric sensor systems, this piezoelectric sensor systems comprises electronic unit to be detected, it is characterized in that this diagnostic device comprises:
Generation has the exciting signal source of the pumping signal of CF or amplitude;
Microprocessor comprises:
The given module of pumping signal of given pumping signal is provided to exciting signal source;
The pumping signal of the pumping signal of more given pumping signal and electronic unit to be detected feedback is module relatively;
Wherein:
Prolong the flow direction of pumping signal, the given module of the pumping signal of microprocessor, exciting signal source, electronic unit to be detected and the pumping signal comparison module of microprocessor are connected successively.
2. diagnostic device as claimed in claim 1, wherein:
Electronic unit to be detected comprises signal processing circuit.
3. diagnostic device as claimed in claim 1 also comprises:
Prolong the flow direction of pumping signal, in electronic unit to be detected and the signal processing circuit between the microprocessor;
Wherein:
Electronic unit to be detected comprises piezoelectric sensor.
4. diagnostic device as claimed in claim 2, wherein:
Signal processing circuit comprises:
Prolong charge amplifier, adjustable gain operational amplifier, low-pass filter, analog to digital converter and buffer circuit that the flow direction of pumping signal connects successively;
First output terminal of exciting signal source is connected with the first input end of charge amplifier;
Second input end of charge amplifier is through piezoelectric sensor ground connection.
5. diagnostic device as claimed in claim 4 also comprises:
Prolong the flow direction of pumping signal, at first output terminal of exciting signal source and the capacitance between the charge amplifier;
Piezoelectric sensor closes between an end and the ground of first output terminal of exciting signal source and is provided with switch or resistance.
6. diagnostic device as claimed in claim 3, wherein:
Signal processing circuit comprises:
Prolong charge amplifier, adjustable gain operational amplifier, low-pass filter, analog to digital converter and buffer circuit that the flow direction of pumping signal connects successively;
The first input end of charge amplifier passes through resistance eutral grounding;
Prolong the flow direction of pumping signal, second output terminal, piezoelectric sensor and the ground of exciting signal source are connected successively;
Piezoelectric sensor is connected with second input end of charge amplifier away from an end of ground connection.
7. diagnostic device as claimed in claim 6 also comprises:
Prolong the flow direction of pumping signal, the capacitance between second input end of second output terminal of exciting signal source and charge amplifier;
Be provided with switch or resistance between piezoelectric sensor and the ground.
8. diagnostic device as claimed in claim 3, wherein:
Signal processing circuit comprises:
Prolong charge amplifier, adjustable gain operational amplifier, low-pass filter, analog to digital converter and buffer circuit that the flow direction of pumping signal connects successively;
The first input end of charge amplifier passes through resistance eutral grounding;
Prolong the flow direction of pumping signal, second input end of the 3rd output terminal, piezoelectric sensor and the charge amplifier of exciting signal source is connected successively.
9. diagnostic device as claimed in claim 8 also comprises:
Prolong the flow direction of pumping signal, at the 3rd output terminal of exciting signal source and the capacitance between the piezoelectric sensor.
10. diagnostic device as claimed in claim 4, wherein:
Electronic unit to be detected also comprises piezoelectric sensor;
The first input end of charge amplifier passes through resistance eutral grounding;
Prolong the flow direction of pumping signal, second output terminal, piezoelectric sensor and the ground of exciting signal source are connected successively.
11. diagnostic device as claimed in claim 4, wherein:
Electronic unit to be detected also comprises piezoelectric sensor;
The first input end of charge amplifier passes through resistance eutral grounding;
Prolong the flow direction of pumping signal, second input end of the 3rd output terminal, piezoelectric sensor and the charge amplifier of exciting signal source is connected successively;
Be used in and be provided with switch instead of piezoelectric sensors ground connection between piezoelectric sensor and the ground.
12. diagnostic device as claimed in claim 6, wherein:
The first input end of charge amplifier passes through resistance eutral grounding;
Prolong the flow direction of pumping signal, second input end of the 3rd output terminal, piezoelectric sensor and the charge amplifier of exciting signal source is connected successively;
Be used in and be provided with switch instead of piezoelectric sensors ground connection between piezoelectric sensor and the ground.
13. diagnostic device as claimed in claim 12, wherein:
First output terminal of exciting signal source is connected with the first input end of charge amplifier.
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|---|---|---|---|
| CN2011204742248U CN202442724U (en) | 2011-11-14 | 2011-11-14 | Diagnostic device of piezoelectric sensor system |
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|---|---|---|---|
| CN2011204742248U CN202442724U (en) | 2011-11-14 | 2011-11-14 | Diagnostic device of piezoelectric sensor system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014176829A1 (en) * | 2013-04-28 | 2014-11-06 | 厦门乃尔电子有限公司 | Piezoelectric type acceleration sensing system with self-excitation diagnosis |
| CN104270108A (en) * | 2014-10-15 | 2015-01-07 | 威海北洋光电信息技术股份公司 | Charge amplifier |
| CN107678419A (en) * | 2017-09-27 | 2018-02-09 | 中国第汽车股份有限公司 | Intelligent VGT actuator active response diagnostic method |
| CN109856493A (en) * | 2018-12-29 | 2019-06-07 | 广东电网有限责任公司 | A kind of detection device for transmission line of electricity |
| CN110646026A (en) * | 2018-06-26 | 2020-01-03 | 佛吉亚汽车座椅有限责任公司 | Analog signal conditioning and diagnostics for capacitive sensor elements |
| CN114295283A (en) * | 2021-12-13 | 2022-04-08 | 深圳数联天下智能科技有限公司 | Piezoelectric sensor fault detection method, device, equipment and medium |
-
2011
- 2011-11-14 CN CN2011204742248U patent/CN202442724U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014176829A1 (en) * | 2013-04-28 | 2014-11-06 | 厦门乃尔电子有限公司 | Piezoelectric type acceleration sensing system with self-excitation diagnosis |
| CN104270108A (en) * | 2014-10-15 | 2015-01-07 | 威海北洋光电信息技术股份公司 | Charge amplifier |
| CN104270108B (en) * | 2014-10-15 | 2017-07-07 | 威海北洋光电信息技术股份公司 | A kind of charge amplifier |
| CN107678419A (en) * | 2017-09-27 | 2018-02-09 | 中国第汽车股份有限公司 | Intelligent VGT actuator active response diagnostic method |
| CN107678419B (en) * | 2017-09-27 | 2020-03-17 | 中国第一汽车股份有限公司 | Intelligent VGT actuator active responsiveness diagnosis method |
| CN110646026A (en) * | 2018-06-26 | 2020-01-03 | 佛吉亚汽车座椅有限责任公司 | Analog signal conditioning and diagnostics for capacitive sensor elements |
| CN109856493A (en) * | 2018-12-29 | 2019-06-07 | 广东电网有限责任公司 | A kind of detection device for transmission line of electricity |
| CN114295283A (en) * | 2021-12-13 | 2022-04-08 | 深圳数联天下智能科技有限公司 | Piezoelectric sensor fault detection method, device, equipment and medium |
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