CN206695822U - A kind of vibrating string type sensor work condition online testing device - Google Patents
A kind of vibrating string type sensor work condition online testing device Download PDFInfo
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- CN206695822U CN206695822U CN201720352646.5U CN201720352646U CN206695822U CN 206695822 U CN206695822 U CN 206695822U CN 201720352646 U CN201720352646 U CN 201720352646U CN 206695822 U CN206695822 U CN 206695822U
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Abstract
The utility model discloses a kind of vibrating string type sensor work condition online testing device, readout instrument is connected with vibrating string type sensor, the accumulation signal that survey measurements instrument is sent；After judging that accumulation signal terminates, induction coil caused by vibrating string type sensor is measured；Induction coil after being terminated according to the accumulation signal or accumulation signal calculates the result about vibrating string type sensor system work condition and display.The utility model measurement result can definitely reflect the work condition of sensing system, not influenceed by physics measuring value；The utility model is with parameters such as the electric currents on sensing system course of work synchronism detection voltage between lines and circuit, the excitaton source of test signal is derived from readout instrument, without the input signal on sensing system, therefore it can realize in X -ray inspection X, be capable of the overall process of dynamic measurement sensor system work.
Description
Technical field
It the utility model is related to a kind of vibrating string type sensor work condition online testing device.
Background technology
The element of vibrating string type sensor system includes sensor, signal cable and readout instrument.Wherein, sense
Device is typically made up of a string wire that can be vibrated, single coil excitement and fixing end.Coil both ends are drawn by signal cable, are seen
Fig. 3.
Sensor, which surveys physical quantity such as stress, pressure etc., can change the intrinsic natural frequency of vibration of string wire, can be passed through by readout instrument
Signal cable connection sensor measures.Usually readout instrument is applied by signal cable at cell winding both ends first
One accumulation signal, string wire forced oscillation in sensor, and continue damped oscillation after stopping applying accumulation signal.Now string wire
Mechanical oscillation electrical signal of reaction is converted into by coil, readout instrument is back to by cable.By readout instrument to signal meter frequency,
The natural frequency of vibration of string wire can be measured.The scope of the general frequency is 500~5000Hz, and corresponding signal voltage amplitude is left in 1mV
The right side, and accumulation signal voltage amplitude is typically in more than 5V.
For vibrating string type sensor in installation process or using after a period of time, sensor or signal cable are possible to impaired
Cause sensor can not normal work, or reading is incorrect.Passed at present generally by the stability of duplicate reading to evaluate
The measured value reliability of sensor, but reading stability is typically only capable of the size of reflection accidental error, and the degree of accuracy can not be reflected, thus
By duplicate reading method can not thoroughly evaluating sensor accuracy, can not equally judge whether the change of reading accurate
Reflect real physical quantity variation.Therefore among practice, when reading changes, analysis personnel are often made to be difficult in thing
Accurate judgement is made between reason amount real change and sensor failure.
In addition to using the method for duplicate reading, prior art also tests the total of coil and cable using general universal meter
The conclusion whether cable or coil break provided to judge the quality of sensing system DC channel for D.C. resistance, sees figure
4.But this method still has limitation, reason is, vibrating string type sensor is to represent physical quantity with the frequency signal of exchange, and resistance
It is not the deciding factor for restricting accuracy of reading.Such as in general vibrating string type sensor, coil resistance in 300 Ω or so,
The resistance of cable can change in the range of 0 ~ 1000 Ω and sensor remains to normal work.In practice resistance is arrived except non-test
More than 100k Ω, can substantially determine it is disconnection fault, in the case where resistance value is not obvious exception, using universal meter without
Method provides the whether normal definite conclusion of instrument work；On the other hand, universal meter is only capable of measuring D.C. resistance, and frequency signal
Decay is related to AC impedance, and D.C. resistance can not represent the performance of cable transmission signal completely, easily cause erroneous judgement.Therefore
When actually using universal meter test, the resistance of some instruments is very big, but still reading is normal, and some normal instrument of resistance measured value
Device but can not reading, can not accurate judgement instrument whether fail, can not more realize carried out in the case where accessing readout instrument it is online
Test.
General purpose oscialloscope and the online observed reading instrument accumulation signal of frequency spectrograph and induced signal can also be used in theory
Waveform and frequency spectrum, but it is preceding addressed, the induced signal voltage amplitude of sensor is only 1mV, not only in the presence of up to 5V's on circuit
Accumulation signal, and it is mingled with a large amount of interference signals, in the case where above-mentioned signal can not be excluded, directly use oscillograph and frequency spectrograph
It is difficult to observe by the induced signal waveform or frequency spectrum of sensor.Oscillograph or frequency spectrograph on-line checking can not be used in thus putting into practice
The working condition of vibrating string type sensor, accumulation signal can not only applied by waveform built in readout instrument or spectrum measurement function
When measure induced signal, but this mode destroys the independency principle of detection, can not exclude survey caused by readout instrument failure
Amount problem, for many occasions, such as readout instrument producer and model are it has been determined that or sensor access is with multichannel reading
The automatic collecting system of number ability, also do not allow to change readout instrument or acquisition system carrys out detection sensor.Traditional sensor
State evaluation means rely primarily on duplicate reading, and the quality of sensor states is speculated with the stability of reading.This method has
Significant limitations, because reading stability is typically only capable of the size of reflected measurement accidental error, and the reflected measurement degree of accuracy is unable to,
Stable reading is not that sensor measures accurate adequate condition；On the other hand because physical quantity variation can also cause reading to change,
Stable reading is nor sensor measures accurate necessary condition, thus found that it is sensor to be often difficult to differentiate between during reading shakiness
Degradation causes or there occurs real physical quantity variation.Using traditional universal meter measurement sensor coil or the electricity of circuit
Resistance, measuring loop need to be formed by universal meter internal current source, and accumulation signal can be exported during readout instrument work, therefore use ten thousand
With readout instrument during table measuring resistance can not normal work, on-line measurement can not be realized.
At present, the working condition for detecting vibrating string type sensor lacks direct efficient apparatus, causes sensor states evaluation tired
It is difficult.The professional standard to come into force in 2013《The vibrating-wire monitor device identification technology codes of DL/T1271-2013》, it is proposed that to passing
The authentication method of sensor, but still be that the Measurement results of the readout instrument in sensor based system are analyzed, it is this by system
The measurement data of system inner assembly has significant limitation to evaluate the method for whole system state, easily by each component in system
Between influence and cause to judge by accident, lack can independently, directly obtain reflection system work condition independent quantitative index side
Method.
Therefore, in face of the increasingly huger install sensor of quantity, it is badly in need of a kind of objective, accurate, independent, directly survey
Trial work section, for evaluating the work condition of vibrating string type sensor.
The content of the invention
Technical problem to be solved in the utility model is, in view of the shortcomings of the prior art, providing a kind of vibrating string type sensor
Work condition online testing device.
In order to solve the above technical problems, technical scheme is used by the utility model：A kind of vibrating string type sensor work
Condition online testing device, including accumulation signal pick-up circuit；The accumulation signal pick-up circuit and controlled amplifier circuit, signal
Cable connection；The controlled amplifier circuit is connected with signal cable, arithmetic processor；The arithmetic processor, controlled amplification electricity
Road, accumulation signal pick-up circuit are connected with controller；The signal cable both ends connect sensor and readout instrument respectively.
The characteristic information of the utility model accumulation signal is included in voltage amplitude, current amplitude, voltage waveform, current waveform
One kind.
Accumulation signal pick-up circuit includes amplitude detection circuit, the amplitude detection circuit and low speed low power differential amplifier
Connection；Or the accumulation signal pick-up circuit includes current sampling resistor, the amplitude in parallel with the current sampling resistor is examined
Wave circuit, the amplitude detection circuit are connected with low speed low power differential amplifier；Or the accumulation signal pick-up circuit includes
High speed low power differential amplifier；Or the accumulation signal pick-up circuit include high speed low power differential amplifier and with the high speed
Low power differential amplifier current sampling resistor in parallel.
Controlled amplifier circuit includes a signal amplification circuit, and the signal amplification circuit input connects controlled signal width
Spend attenuator circuit.
Controlled amplifier circuit includes differential amplifier, and the differential amplifier is connected with voltage cut-out, the voltage
The control logic electrical signal of controlling switch and controller connects.
The arithmetic processor is connected with display, facilitates display processing result.
In the utility model, it will swash in the measurement circuitry that accumulation signal pick-up circuit is used to form in sensor and readout instrument
The characteristic information of signal of shaking is transformed to standard electric signal；Controlled amplifier circuit can according to the control logic electric signal of controller,
The characteristic information of induction coil after accumulation signal is terminated is transformed to standard electric signal；Controller is used to judge that exciting is believed
Number whether terminate, and to controlled amplifier circuit and arithmetic processor output control logic electric signal；Arithmetic processor is used for basis
The control logic electric signal of controller, measurement represent accumulation signal standard electric signal and accumulation signal terminate after representative coil
The standard electric signal of induced signal characteristic information, and the standard electric signal is handled to obtain relevant vibrating string type sensor system
The result for work condition of uniting；Display is used to show the result that arithmetic processor obtains.
Compared with prior art, had the beneficial effect that possessed by the utility model：The utility model is with sensor system
Parameter, the excitaton sources of test signal such as the electric current on system course of work synchronism detection voltage between lines and circuit are derived from readout instrument, nothing
Need on sensing system input signal, therefore can realize in X -ray inspection X, be capable of the complete of dynamic measurement sensor system work
Process.Using device of the present utility model, accumulation signal can be directly judged whether from measurement circuitry, is read without passing through
Number instrument obtains the information of the sensing system course of work, can be in any component of sensing system being changed without including readout instrument
On the premise of complete test job.
Brief description of the drawings
Fig. 1 is the utility model method flow diagram；
Fig. 2 is to the utility model is related to the part that device includes；
Fig. 3 is the element of vibrating string type sensor；
Fig. 4 is schematic diagram of the tradition using universal meter detection vibrating string type sensor；
Fig. 5 is one embodiment of accumulation signal pick-up circuit, pick-up voltage amplitude；
Fig. 6 is one embodiment of accumulation signal pick-up circuit, picks up current amplitude；
Fig. 7 is one embodiment of accumulation signal pick-up circuit, pick-up voltage waveform；
Fig. 8 is one embodiment of accumulation signal pick-up circuit, picks up current waveform；
Fig. 9 is one embodiment of controller, and range signal is converted into level triggers signal；
Figure 10 is one embodiment of controller, and waveform signal is converted into discrete waveform series, judged on test line
Whether there is accumulation signal；
Figure 11 is one embodiment of arithmetic processor, according to the control logic electric signal of controller, by accumulation signal
The standard electric signal of representative induction coil characteristic information after standard electric signal and accumulation signal terminate is converted to discrete wave
Shape series, and handled to obtain the result about vibrating string type sensor system work condition；
Figure 12 is one embodiment of controlled amplifier circuit, output be induced signal waveform；
Figure 13 is one embodiment of the utility model device, and hardware spending is reduced by simplifying function；
Figure 14 is one embodiment of the utility model device, is realized by more rich hardware configuration multi-functional；
Figure 15 is the normal vibrating string type sensor induction voltage waveform output measured using the utility model；
Figure 16 is the improper vibrating string type sensor induction voltage waveform output measured using the utility model；
Mark in the figures above is respectively：
1-accumulation signal pick-up circuit, 2-controlled amplifier circuit, 3-controller, 4-arithmetic processor, 5-controller
Accumulation signal input, the control signal input of 6-controlled amplifier circuit, 7-arithmetic processor accumulation signal input
End, 8-induced signal input, the control signal input of 9-arithmetic processor, 10-sensor, 11-readout instrument,
12-display, 50-string wire, 51-fixing end, 52-single coil excitement, 53-signal cable, 54-universal meter, 101-amplitude
Detecting circuit, 102-low speed low power differential amplifier, 103-current sampling resistor, 104-high speed low power differential amplifier,
201-voltage cut-out, 202-differential amplifier, 301-level trigger, 302-accumulation signal analog-digital converter,
303-data/address bus, 304-digital signal processor, 401-accumulation signal analog-digital converter, 402-induced signal modulus turn
Parallel operation, 403-data/address bus, 404-arithmetic unit, 405-exciting current signal analog-digital converter, 406-exciting voltage signal
Analog-digital converter.
Embodiment
Such as Fig. 1, method of the present utility model comprises the following steps：
1）Readout instrument is connected with vibrating string type sensor, the accumulation signal that survey measurements instrument is sent；
2）After judging that accumulation signal terminates, induction coil caused by vibrating string type sensor is measured；
3）Induction coil after being terminated according to the accumulation signal and accumulation signal calculates relevant vibrating string type sensor
The result of system work condition and display.
Such as Fig. 2, device of the present utility model includes accumulation signal pick-up circuit 1, controlled amplifier circuit 2, controller 3, fortune
Calculate processor 4 and display 12；The test signal input of accumulation signal pick-up circuit 1 and controlled amplifier circuit 2 is accessed by passing
In the measurement circuitry that sensor 10 and readout instrument 11 are formed；The signal output part access controller 3 of accumulation signal pick-up circuit 1 swashs
Shake the accumulation signal input 7 of signal input part 5 and arithmetic processor 4；The signal output part access computing of controlled amplifier circuit 2
The induced signal input 8 of processor 4；The control signal of the control signal output access controlled amplifier circuit 2 of controller 3 is defeated
Enter the control signal input 9 of end 6 and arithmetic processor 4；The display signal output part access display 12 of arithmetic processor 4
Show signal input part.
In concrete practice, the amplitude of the accumulation signal that the readout instrument 11 in Fig. 2 is sent and frequency are different because of manufacturer
And it is otherwise varied, also difference, general readout instrument and sensor select same producer to respective sensor 10 between different manufacturers
Support the use.
For ease of illustration embodiment, the exciting voltage amplitude of readout instrument 11 in Fig. 2 is set as 5V, excited frequency
For 500Hz to 5000H frequency sweeps, the output induced signal voltage of respective sensor 10 is 10mV, resonant frequency 2000Hz.Make
When carrying out normal reading with readout instrument 11, the loading frequency 500Hz to 5000Hz first on cable of readout instrument 11, amplitude is 5V's
Accumulation signal, when readout instrument accumulation signal frequency sweep is exported to 2000Hz or so, sensor is in resonant condition, and string wire 50 rises
Shake.After readout instrument 11 completes frequency sweep process, sensor string wire 50 continues to vibrate, and readout instrument now measures 10mV induced signal frequency
Rate, display frequency is 2000Hz measured value on readout instrument.The utility model is added work online after form test, this
The specific implementation handling process of utility model each several part is：
Fig. 5 show one embodiment of the voltage amplitude of accumulation signal pick-up circuit pickup accumulation signal, scanning frequency excitation
After the 5V voltages of signal enter amplitude detection circuit 101, the AC portion of scanning frequency excitation signal is filtered out, output and accumulation signal
The related size about 2V of amplitude direct current differential voltage, after being amplified by low speed low power differential amplifier 102, being converted into trigger
The 2V direct current single-ended voltage signals of controller 3；When no scanning frequency excitation signal, the differential electricity of the output of amplitude detection circuit 101
Pressure amplitude degree very little, at most only tens mV induced signal or interference signal, due to the amplification of low speed low power differential amplifier 102
Multiple is low, and the direct current single-ended voltage signal of output still only has tens mV, therefore is picked up in the measurement process of readout instrument 11, accumulation signal
What sense circuit exported is the single-ended voltage signal of standard.
Fig. 6 show one embodiment of the current amplitude of accumulation signal pick-up circuit pickup accumulation signal, passes through electric current
Sample resistance is sent into amplitude detection circuit 101 after accumulation signal electric current is converted into differential voltage, and remaining is identical with Fig. 5.Electric current
The of different sizes of sample resistance can form different differential voltages, but will all turn after the adjustment of low speed low power differential amplifier 102
It is changed to the single-ended voltage signal of standard.
Fig. 7 show one embodiment of the voltage waveform of accumulation signal pick-up circuit pickup accumulation signal, passes through at a high speed
Low power differential amplifier 104 directly amplifies accumulation signal voltage, is converted into the ripple of suitable controller 3 and arithmetic processor 4 measurement
Shape signal.The input voltage of normal controller 3 and the analog-digital converter in arithmetic processor 4 is 2V, to expire 5V accumulation signals
The input range of sufficient analog-digital converter is put in this example, it is necessary to amplify scanning frequency excitation voltage using high speed low power differential amplifier 104
The bandwidth of big device 104 should be higher than that 5000Hz, multiplication factor 0.4.
Fig. 8 show one embodiment of the current waveform of accumulation signal pick-up circuit pickup accumulation signal, passes through electric current
Accumulation signal electric current is converted to and high speed low power differential amplifier 104 is sent into after differential voltage by sample resistance, remaining and Fig. 7 phases
Together.The of different sizes of current sampling resistor can form different differential voltages, but after the adjustment of high speed low power differential amplifier 104
The analog-digital converter input requirements that will all meet in controller 3 and arithmetic processor 4.
Fig. 9 show one embodiment that range signal is converted into level triggers signal by controller 3, and accumulation signal terminates
When, there was only tens mV in the single-end DC voltage of accumulation signal input 5, the 1V set in advance less than level trigger 301 is touched
Send out thresholding, control signal output output enable signal；When having accumulation signal on circuit, in the single-ended of accumulation signal input 5
Direct current is pressed with 2V, triggers thresholding higher than the 1V that level trigger 301 is set in advance, letter is forbidden in control signal output output
Number.
Figure 10 show controller 3 and waveform signal is converted into discrete waveform series, is sentenced according to discrete waveform data series
Accumulation signal is whether there is on disconnected test line, and will determine that one embodiment that result exports through control signal output, in exciting
The waveform signal of signal input part 5 is after accumulation signal analog-digital converter 302 is converted to discrete waveform series, by data/address bus
303 deliver to digital signal processor 304, calculate the amplitude of waveform series, when having accumulation signal on the line, the amplitude of waveform
It is defeated higher than 1V accumulation signal amplitude Rule of judgment preset in digital signal processor 304, control signal output for 2V or so
Go out disable signal, when accumulation signal stops, wave-shape amplitude only has tens mV, preset less than in digital signal processor 304
1V accumulation signal amplitude Rule of judgment, control signal output output enable signal.
Figure 11 show control logic electric signal of the arithmetic processor 4 according to controller, by the standard telecommunications of accumulation signal
Number and accumulation signal terminate after representative induction coil characteristic information standard electric signal be converted to discrete waveform series, and
Handled to obtain one embodiment of the result about vibrating string type sensor system work condition, accumulation signal input 7
Waveform signal is converted to discrete waveform series through accumulation signal analog-digital converter 401, the waveform signal of induced signal input 8 passes through
After induced signal analog-digital converter 402 is converted to discrete waveform series, arithmetic unit 404 is delivered to by data/address bus 403 and completes to calculate
Process.With Digital Signal Processing, the impedance of measurement circuitry under induced signal frequency, induced signal can be calculated
Duration of exemplary amplitude scope in amplitude, frequency, wave-shape amplitude rate of decay, wave-shape amplitude attenuation process, signal to noise ratio with
And frequency spectrum etc..
Specifically, signal amplitude can be extracted using numerical operation mode；It can use in the unit interval to wave period meter
Several methods try to achieve signal frequency；The variable quantity of signal amplitude can be extracted within the unit interval, obtains wave-shape amplitude decay speed
Rate；It can record to terminate to drop to readout instrument to induced signal amplitude from accumulation signal and can not measure the undergone time, obtain
The duration of exemplary amplitude scope in wave-shape amplitude attenuation process；Signal spectrum can be calculated using FFT；Can be by
The signal and the frequency characteristic of noise that FFT obtains, calculate signal to noise ratio.The frequency of induced signal, then frequency herein can be calculated
Measurement circuitry is tried to achieve under rate by the way of the multivariables such as instantaneous voltage, electric current carry out numerical operation to accumulation signal in sensing to believe
Impedance under number frequency, and included in impedance resistance, the parameter such as reactance.
Figure 12 show one embodiment that controlled amplifier circuit 2 exports the waveform of induced signal, voltage cut-out 201
When forbidding, signal cannot be introduced into differential amplifier 202, no signal output；It is now differential to put when voltage cut-out 201 enables
Induced signal waveform is amplified to the amplitude of suitable analog-digital converter sampling by big device 202.In this example, the voltage amplitude of induced signal
Spend for 10mV, the input voltage of analog-digital converter is 2V, and the multiplication factor of corresponding differential amplifier 202 is 200 times.
Each building block of the present utility model can select in above-mentioned embodiment, then connect and compose this by each part
Utility model.Different, several embodiments of the present utility model presented below according to the emphasis of test：
Figure 13 is one embodiment that the utility model lays particular emphasis on simplified function reduction hardware spending, is had on signal cable sharp
Shake signal when, electricity that amplitude detection circuit 101 and low speed low power differential amplifier 102 in accumulation signal pick-up circuit 1 export
The output disable signal of level trigger 301 in ordinary mail trigger controller 3, the output of the no signal of controlled amplifier circuit 2, while electricity
The disable signal that flat trigger 301 exports enters the arithmetic unit 404 of arithmetic processor 4, and induced signal processing function stops, exciting
Signal processing function activates, and the accumulation signal analog-digital converter 401 that accumulation signal is sent into arithmetic processor 4 completes discrete waveform
Data series are changed, and the arithmetic unit 404 through arithmetic processor 4 completes calculating process, can calculate the voltage amplitude of accumulation signal；
When on signal cable without accumulation signal, level trigger 301 exports enable signal, the exciting of arithmetic unit 404 letter of arithmetic processor 4
Number processing function stops, the activation of induced signal processing function, and the voltage cut-out 201 in controlled amplifier circuit 2 turns on, and senses
Signal enters the induced signal analog-digital converter 402 being sent into after differential amplifier 202 amplifies in arithmetic processor 4 and completes discrete wave
Graphic data series conversion, the arithmetic unit 404 through arithmetic processor 4 complete calculating process, can calculate amplitude, the frequency of induced signal
Duration, signal to noise ratio and the frequency spectrum of exemplary amplitude scope in rate, wave-shape amplitude rate of decay, wave-shape amplitude attenuation process
Deng, and result of calculation is shown by display 12.
Figure 14 is that the utility model lays particular emphasis on one embodiment that most of functions are realized by more rich hardware configuration,
Accumulation signal pick-up circuit 1 picks up current waveform and voltage waveform simultaneously, and current waveform signal is converted to discrete wave by controller 3
Shape series, judges accumulation signal is whether there is on test line, and will determine that result is sent to controlled according to discrete waveform data series
Amplifying circuit 2 and arithmetic processor 4.When having accumulation signal on signal cable, the output disable signal of controller 3, controlled amplification electricity
The no signal output of road 2；Accumulation signal pick-up circuit 1 picks up obtained current waveform and voltage waveform respectively through exciting current signal
Analog-digital converter 405 and exciting voltage signal analog-digital converter 406 are kept in after being converted to discrete waveform series in arithmetic unit 404.
When on signal cable without accumulation signal, controller 3 exports enable signal, and the voltage cut-out 201 in controlled amplifier circuit 2 is led
Logical, it is complete that induced signal enters after differential amplifier 202 amplifies the induced signal analog-digital converter 402 being sent into arithmetic processor 4
Changed into discrete waveform data series.Arithmetic unit 404 completes the calculating of accumulation signal and induced signal discrete waveform data series
Process, exemplary amplitude in the amplitude of induced signal, frequency, wave-shape amplitude rate of decay, wave-shape amplitude attenuation process can be calculated
Duration, signal to noise ratio, frequency spectrum and measurement circuitry impedance of scope etc., and shown by display 12.The embodiment uses
Hardware circuit is more, requires higher to the computing capability of arithmetic unit 404, control logic is by digital signal processor in controller 3
304 software is realized.Arithmetic unit 404 and digital signal processor 304 can select chip microcontroller, new for this practicality
Type, it is to employ two single-chip microcomputers on function logic, but in actual product, can also the actual choosing by the way of time-sharing multiplex
The function of 1 chip microcontroller arithmetic unit 404 and digital signal processor 304 is selected, to simplify circuit, saves cost.
Claims (9)
- The condition online testing device 1. a kind of vibrating string type sensor works, it is characterised in that including accumulation signal pick-up circuit；Institute Accumulation signal pick-up circuit is stated to be connected with controlled amplifier circuit, signal cable；The controlled amplifier circuit and signal cable, computing Processor connects；The arithmetic processor, controlled amplifier circuit, accumulation signal pick-up circuit are connected with controller；The letter Number cable both ends connect sensor and readout instrument respectively.
- The condition online testing device 2. vibrating string type sensor according to claim 1 works, it is characterised in that the exciting The characteristic information of signal includes one kind in voltage amplitude, current amplitude, voltage waveform, current waveform.
- The condition online testing device 3. vibrating string type sensor according to claim 1 works, it is characterised in that the exciting Signal pickup circuit includes amplitude detection circuit, and the amplitude detection circuit is connected with low speed low power differential amplifier；Or institute Stating accumulation signal pick-up circuit includes current sampling resistor, the amplitude detection circuit in parallel with the current sampling resistor, described Amplitude detection circuit is connected with low speed low power differential amplifier；Or the accumulation signal pick-up circuit is differential including high speed low power Amplifier；Or the accumulation signal pick-up circuit include high speed low power differential amplifier and with the differential amplification of high speed low power Device current sampling resistor in parallel.
- The condition online testing device 4. vibrating string type sensor according to claim 1 works, it is characterised in that described controlled Amplifying circuit includes a signal amplification circuit, and the signal amplification circuit input connects controlled signal amplitude fading circuit.
- The condition online testing device 5. vibrating string type sensor according to claim 1 works, it is characterised in that described controlled Amplifying circuit includes differential amplifier, and the differential amplifier is connected with voltage cut-out, the voltage cut-out and control The control logic electrical signal connection of device processed.
- The condition online testing device 6. vibrating string type sensor according to claim 1 works, it is characterised in that the control Device includes level trigger.
- The condition online testing device 7. vibrating string type sensor according to claim 1 works, it is characterised in that the control Device includes digital signal processor, and the digital signal processor receives the data signal of analog-digital converter output.
- The condition online testing device 8. vibrating string type sensor according to claim 1 works, it is characterised in that the computing Processor includes arithmetic unit, and the arithmetic unit receives the data signal of analog-digital converter output.
- 9. the vibrating string type sensor work condition online testing device according to one of claim 1~8, it is characterised in that The arithmetic processor is connected with display.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110488697A (en) * | 2019-08-16 | 2019-11-22 | 江西飞尚科技有限公司 | A kind of Portable engineering and signal analyzer and its analysis method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110488697A (en) * | 2019-08-16 | 2019-11-22 | 江西飞尚科技有限公司 | A kind of Portable engineering and signal analyzer and its analysis method |
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