CN203859727U - Device for detecting weak signals - Google Patents
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- CN203859727U CN203859727U CN201320762787.6U CN201320762787U CN203859727U CN 203859727 U CN203859727 U CN 203859727U CN 201320762787 U CN201320762787 U CN 201320762787U CN 203859727 U CN203859727 U CN 203859727U
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Abstract
The utility model discloses a device for detecting weak signals. The device consists of a differential amplification circuit, a band-pass filtering circuit, a waveform shaping circuit, a phase-shift circuit, an analog multiplier, a low-pass filtering circuit, an AD (analog/digital) converter and a display, wherein the differential amplification circuit comprises a first operational amplifier, a second operational amplifier, a third operational amplifier and a resistor; the band-pass filtering circuit comprises a fourth operational amplifier, a fifth operational amplifier, a resistor and a capacitor; the waveform shaping circuit comprises a sixth operational amplifier, a resistor and a capacitor; the phase-shift circuit comprises a seventh operational amplifier, an eighth operational amplifier, a resistor and a capacitor; the low-pass filtering circuit comprises a ninth low-pass filtering circuit, a resistor and a capacitor; the output end of the ninth low-pass filtering circuit is connected with the AD converter; the AD converter is connected with the display. Weak small signals are extracted and the amplitudes of the weak small signals are detected by the device; the whole device is low in power consumption and cost and high in detection accuracy; circuit structures are simple, and the device is convenient to use when being carried by a user.
Description
Technical field
The utility model relates to a kind of signal detection technique, relates in particular to a kind of device that detects small-signal.
Background technology
In more modern common natural phenomenas and some, have in the scientific research and engineering practice of rule variation, usually can run into the problem that needs to detect very little nanovolt magnitude signal.Therefore, just there is on this basis this emerging subscience technology of Detection of Weak Signals, in every field, be also widely used simultaneously, it utilizes the conventional methods such as electronics, information theory and physics, analyze reason and rule that noise produces, study feature and the correlation of tested small-signal, detect and recover by the small-signal of noise takeover.
Detection of Weak Signals is an emerging complex art in measuring technique, and its development is also paid attention to rapidly very much very much, thinks the faint amount can't detect exactly because it can detect traditional concept.
For the Weak characteristic input under strong noise background, be a difficult problem of each engineering application, the method for the main research of Testing of Feeble Signals now has time domain, frequency domain, time-frequency domain and the method for detecting weak signals based on nonlinear theory based on linear theory always.And, recent years, along with input and in processing, introduce the mathematical theory based on Kind of Nonlinear Dynamical System, as chaology, Stochastic Resonance Theory etc., in Detection of Weak Signals research field, the method for utilizing the distinctive character of Kind of Nonlinear Dynamical System to detect small-signal shows advantage gradually.Therefore,, along with the extensive use of nonlinear treory and method in input and processing, nonlinear analytical method can be also one of main direction of following Detection of Weak Signals research.
Because the kind of small-signal, noise is more, as weak periodic signal and nonperiodic signal, Weak pulse signal, impact signal, noise is just like Gaussian noise, band limited noise, narrow-band noise etc., and different signals and the mixing of noise cause detected signal comparatively complicated.In reality detects, in conjunction with multiple detection method, detecting small-signal has become a kind of trend gradually.
Current existing micro-signal detection method has multiple, but the whole bag of tricks respectively has pluses and minuses, each own application separately.Main Analysis coherent detection in time domain detection method, Sampling Integral and digital average; In frequency domain detection method, analyze the most conventional Spectral Analysis Method; The widest Fourier in short-term and the wavelet transformation of Main Analysis range of application in Time-frequency Analysis; Selective analysis accidental resonance in detection method based on nonlinear theory.In reality detects, in conjunction with multiple detection method, detecting small-signal has become a kind of trend gradually.
Detect small-signal and not only need in very noisy, detect echo signal, and some detection signal frequency is higher, also requires detection system must have enough fast detection speed.In current numerous detection method, still there are many limitation.
Utility model content
Large in order to overcome Detection of Weak Signals difficulty, accuracy is low, and the utility model provides a kind of device that detects accurately, fast and easily small-signal of realizing small-signal under strong noise environment.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
The device that detects small-signal, this device is comprised of differential amplifier circuit, bandwidth-limited circuit, waveform shaping circuit, phase-shift circuit, analog multiplier, low-pass filter circuit, AD converter and display;
Described differential amplifier circuit comprises the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, resistance R 2, resistance R 4, resistance R 5, resistance R 7, adjustable resistance R12, resistance R 13, resistance R 15, resistance R 18 and resistance R 19, the in-phase end of described the first operational amplifier is connected with one end of resistance R 2, the end of oppisite phase of described the first operational amplifier is connected with one end of resistance R 7, one end of described adjustable resistance R12 is also connected with one end of resistance R 7, and the other end of resistance R 7 is connected with the output of the first operational amplifier, the other end of described adjustable resistance R12 is connected with the end of oppisite phase of the second operational amplifier, the end of oppisite phase of described the second operational amplifier is connected with the output of the second operational amplifier by resistance R 13, the in-phase end of described the second operational amplifier is by resistance R 18 ground connection, the output of described the second operational amplifier is connected with one end of resistance R 15, the other end of described resistance R 15 is connected with the in-phase end of the 3rd operational amplifier, the other end of described resistance R 15 is also connected with one end of resistance R 19, the other end ground connection of described resistance R 19, the output of described the first operational amplifier is connected with the end of oppisite phase of the 3rd operational amplifier by resistance R 4, the end of oppisite phase of described the 3rd operational amplifier is connected with the output of the 3rd operational amplifier by resistance R 5,
Described bandwidth-limited circuit comprises four-operational amplifier, the 5th operational amplifier, resistance R 6, resistance R 3, resistance R 10, resistance R 11, resistance R 14, resistance R 21, resistance R 22, resistance R 23, capacitor C 4, capacitor C 5, capacitor C 16 and capacitor C 17, the in-phase end of described four-operational amplifier is connected with one end of resistance R 3, the other end of resistance R 3 is connected with one end of resistance R 6, the other end of resistance R 6 is connected with the output of the 3rd operational amplifier, one end of described resistance R 3 is connected with one end of capacitor C 5, the other end ground connection of capacitor C 5, the end of oppisite phase of described four-operational amplifier is by resistance R 10 ground connection, the end of oppisite phase of described four-operational amplifier is also connected with one end of capacitor C 16 by resistance R 11, the other end of described capacitor C 16 is connected with one end of capacitor C 17, the other end of capacitor C 17 is connected with the in-phase end of the 5th operational amplifier, the in-phase end of described the 5th operational amplifier is by resistance R 21 ground connection, the end of oppisite phase of described the 5th operational amplifier is by resistance R 22 ground connection, the end of oppisite phase of the 5th operational amplifier is connected with the output of the 5th operational amplifier by resistance R 23, the output of described the 5th operational amplifier is connected with the other end of capacitor C 16 by resistance R 14,
Described waveform shaping circuit comprises the 6th operational amplifier, resistance R 24, resistance R 25 and capacitor C 21, the in-phase end of described the 6th operational amplifier is connected with one end of resistance R 25, the other end of resistance R 25 is connected with the output of the 5th operational amplifier, the end of oppisite phase ground connection of described the 6th operational amplifier, the output of described the 6th operational amplifier is connected with one end of capacitor C 21 by resistance R 24, the other end ground connection of described capacitor C 21; Described the 6th output of operational amplifier and the input of analog multiplier are connected;
Described phase-shift circuit comprises the 7th operational amplifier, the 8th operational amplifier, resistance R 1, adjustable resistance R8, resistance R 9, adjustable resistance R16, resistance R 17, resistance R 20, capacitor C 6 and capacitor C 15; Described the 7th operational amplifier in-phase end is connected with one end of capacitor C 6, the other end of described capacitor C 6 is connected with the output of the 5th operational amplifier, described the 7th operational amplifier in-phase end is also by resistance R 1 ground connection, the end of oppisite phase of described the 7th operational amplifier is connected with one end of adjustable resistance R8, the other end of described adjustable resistance R8 is connected with the output of the 5th operational amplifier, the end of oppisite phase of the 7th operational amplifier is also connected with one end of resistance R 9, and the other end of resistance R 9 is connected with the output of the 7th operational amplifier; The other end of described resistance R 9 is connected with one end of adjustable resistance R16, the other end of resistance R 9 is also connected with one end of resistance R 17, the other end of described adjustable resistance R16 is connected with the in-phase end of the 8th operational amplifier, the other end of described resistance R 17 is connected with the in-phase end of the 8th operational amplifier, the in-phase end of described the 8th operational amplifier is also by capacitor C 15 ground connection, and the end of oppisite phase of described the 8th operational amplifier is connected with the output of the 8th operational amplifier by resistance R 20; Described the 8th output of operational amplifier and the input of analog multiplier are connected;
Described low-pass filter circuit comprises the 9th operational amplifier, resistance R 27, resistance R 28, resistance R 29, resistance R 30, capacitor C 23 and capacitor C 25, the in-phase end of described the 9th operational amplifier is connected with one end of resistance R 28, the other end of resistance R 28 is connected with one end of resistance R 27, the other end of described resistance R 27 is connected with the output of analog multiplier, the in-phase end of described the 9th operational amplifier is by capacitor C 25 ground connection, the end of oppisite phase of described the 9th operational amplifier is by resistance R 29 ground connection, the end of oppisite phase of described the 9th operational amplifier is connected with the output of the 9th operational amplifier by resistance R 30, the output of described the 9th operational amplifier is connected with the other end of resistance R 28 by capacitor C 23, the output of described the 9th operational amplifier is connected with AD converter, and described AD converter is connected with display.
Compared with prior art, the utlity model has following advantage:
1, the device of detection small-signal goes out faint extraction of small signals and detects its amplitude, and whole device power consumption is low, accuracy of detection is high, cost is low; Circuit structure is simple, is beneficial in portable middle use.
2, the device of this detection small-signal detects principle according to phase-locked loop, can detect accurately, fast and easily small-signal.
3, this device that detects small-signal adopts phase-locked loop to detect principle, and small-signal is carried out to Detection and Extraction, calculates detection signal effective value, and shows after processing by single-chip microcomputer.
Accompanying drawing explanation
Fig. 1 is differential amplifier circuit figure;
Fig. 2 is bandwidth-limited circuit figure;
Fig. 3 is waveform shaping circuit figure;
Fig. 4 is phase-shift circuit figure;
Fig. 5 is the circuit diagram of analog multiplier;
Fig. 6 is low-pass filter circuit figure.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
The device that detects small-signal, this device is comprised of differential amplifier circuit, bandwidth-limited circuit, waveform shaping circuit, phase-shift circuit, analog multiplier, low-pass filter circuit, AD converter and display.
Wherein, as shown in Figure 1, differential amplifier circuit comprises the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, resistance R 2, resistance R 4, resistance R 5, resistance R 7, adjustable resistance R12, resistance R 13, resistance R 15, resistance R 18 and resistance R 19 to differential amplifier circuit.The in-phase end of the first operational amplifier is connected with one end of resistance R 2, the end of oppisite phase of the first operational amplifier is connected with one end of resistance R 7, one end of adjustable resistance R12 is also connected with one end of resistance R 7, and the other end of resistance R 7 is connected with the output of the first operational amplifier.The other end of adjustable resistance R12 is connected with the end of oppisite phase of the second operational amplifier, the end of oppisite phase of the second operational amplifier is connected with the output of the second operational amplifier by resistance R 13, the in-phase end of the second operational amplifier is by resistance R 18 ground connection, the output of the second operational amplifier is connected with one end of resistance R 15, the other end of resistance R 15 is connected with the in-phase end of the 3rd operational amplifier, the other end of resistance R 15 is also connected with one end of resistance R 19, the other end ground connection of resistance R 19, the output of the first operational amplifier is connected with the end of oppisite phase of the 3rd operational amplifier by resistance R 4, the end of oppisite phase of the 3rd operational amplifier is connected with the output of the 3rd operational amplifier by resistance R 5.
As shown in Figure 2, bandwidth-limited circuit comprises four-operational amplifier, the 5th operational amplifier, resistance R 6, resistance R 3, resistance R 10, resistance R 11, resistance R 14, resistance R 21, resistance R 22, resistance R 23, capacitor C 4, capacitor C 5, capacitor C 16 and capacitor C 17 to bandwidth-limited circuit.The in-phase end of four-operational amplifier is connected with one end of resistance R 3, the other end of resistance R 3 is connected with one end of resistance R 6, the other end of resistance R 6 is connected with the output of the 3rd operational amplifier, one end of resistance R 3 is connected with one end of capacitor C 5, the other end ground connection of capacitor C 5, the end of oppisite phase of four-operational amplifier is by resistance R 10 ground connection, the end of oppisite phase of four-operational amplifier is also connected with one end of capacitor C 16 by resistance R 11, the other end of capacitor C 16 is connected with one end of capacitor C 17, the other end of capacitor C 17 is connected with the in-phase end of the 5th operational amplifier, the in-phase end of the 5th operational amplifier is by resistance R 21 ground connection, the end of oppisite phase of the 5th operational amplifier is by resistance R 22 ground connection, the end of oppisite phase of the 5th operational amplifier is connected with the output of the 5th operational amplifier by resistance R 23, the output of the 5th operational amplifier is connected with the other end of capacitor C 16 by resistance R 14.
As shown in Figure 3, waveform shaping circuit comprises the 6th operational amplifier, resistance R 24, resistance R 25 and capacitor C 21 to waveform shaping circuit.The in-phase end of the 6th operational amplifier is connected with one end of resistance R 25, the other end of resistance R 25 is connected with the output of the 5th operational amplifier, the end of oppisite phase ground connection of the 6th operational amplifier, the output of the 6th operational amplifier is connected with one end of capacitor C 21 by resistance R 24, the other end ground connection of capacitor C 21; The 6th output of operational amplifier and the input of analog multiplier are connected, and the circuit of analog multiplier as shown in Figure 5.
As shown in Figure 4, phase-shift circuit comprises the 7th operational amplifier, the 8th operational amplifier, resistance R 1, adjustable resistance R8, resistance R 9, adjustable resistance R16, resistance R 17, resistance R 20, capacitor C 6 and capacitor C 15 to phase-shift circuit.The 7th operational amplifier in-phase end is connected with one end of capacitor C 6, the other end of capacitor C 6 is connected with the output of the 5th operational amplifier, the 7th operational amplifier in-phase end is also by resistance R 1 ground connection, the end of oppisite phase of the 7th operational amplifier is connected with one end of adjustable resistance R8, the other end of adjustable resistance R8 is connected with the output of the 5th operational amplifier, the end of oppisite phase of the 7th operational amplifier is also connected with one end of resistance R 9, and the other end of resistance R 9 is connected with the output of the 7th operational amplifier.The other end of resistance R 9 is connected with one end of adjustable resistance R16, the other end of resistance R 9 is also connected with one end of resistance R 17, the other end of adjustable resistance R16 is connected with the in-phase end of the 8th operational amplifier, the other end of resistance R 17 is connected with the in-phase end of the 8th operational amplifier, the in-phase end of the 8th operational amplifier is also by capacitor C 15 ground connection, and the end of oppisite phase of the 8th operational amplifier is connected with the output of the 8th operational amplifier by resistance R 20.The 8th output of operational amplifier and the input of analog multiplier are connected.
As shown in Figure 6, low-pass filter circuit comprises the 9th operational amplifier, resistance R 27, resistance R 28, resistance R 29, resistance R 30, capacitor C 23 and capacitor C 25 to low-pass filter circuit.The in-phase end of the 9th operational amplifier is connected with one end of resistance R 28, the other end of resistance R 28 is connected with one end of resistance R 27, the other end of resistance R 27 is connected with the output of analog multiplier, the in-phase end of the 9th operational amplifier is by capacitor C 25 ground connection, the end of oppisite phase of the 9th operational amplifier is by resistance R 29 ground connection, the end of oppisite phase of the 9th operational amplifier is connected with the output of the 9th operational amplifier by resistance R 30, and the output of the 9th operational amplifier is connected with the other end of resistance R 28 by capacitor C 23.The output of the 9th operational amplifier is connected with AD converter, and AD converter is connected with display.
Signal to be detected is by resistance R 2 input the first operational amplifiers, and signal to be detected, through differential amplifier circuit, carries out preliminary amplification to signal and processes, and suppresses common-mode signal, amplifies difference mode signal.Signal after amplification enters bandwidth-limited circuit, the frequency range that the passband of bandwidth-limited circuit is detection signal, and the noise outside filtering overwhelming majority passband, obtains filtering signal; Filtering signal is processed through Shape correction and phase-shift circuit, obtains respectively frequency, square wave (multiplying signal) and sine wave (quilt is taken advantage of signal) that phase place is consistent; The phase-locked loop amplifying circuit that input consists of analog multiplier using them as rectified signal is processed, and obtains phase-locked amplifying signal; Use low-pass filter circuit this signal to be processed to the effective value that obtains this signal; And change by AD, by this RMS-DC converter, be digital signal; Single-chip microcomputer, by this digital signal is processed, has just obtained the amplitude of primary signal, and shows by display.
Finally explanation is, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement the technical solution of the utility model, and not departing from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (1)
1. detect the device of small-signal, it is characterized in that: this device is comprised of differential amplifier circuit, bandwidth-limited circuit, waveform shaping circuit, phase-shift circuit, analog multiplier, low-pass filter circuit, AD converter and display;
Described differential amplifier circuit comprises the first operational amplifier, the second operational amplifier, the 3rd operational amplifier, resistance R 2, resistance R 4, resistance R 5, resistance R 7, adjustable resistance R12, resistance R 13, resistance R 15, resistance R 18 and resistance R 19, the in-phase end of described the first operational amplifier is connected with one end of resistance R 2, the end of oppisite phase of described the first operational amplifier is connected with one end of resistance R 7, one end of described adjustable resistance R12 is also connected with one end of resistance R 7, and the other end of resistance R 7 is connected with the output of the first operational amplifier, the other end of described adjustable resistance R12 is connected with the end of oppisite phase of the second operational amplifier, the end of oppisite phase of described the second operational amplifier is connected with the output of the second operational amplifier by resistance R 13, the in-phase end of described the second operational amplifier is by resistance R 18 ground connection, the output of described the second operational amplifier is connected with one end of resistance R 15, the other end of described resistance R 15 is connected with the in-phase end of the 3rd operational amplifier, the other end of described resistance R 15 is also connected with one end of resistance R 19, the other end ground connection of described resistance R 19, the output of described the first operational amplifier is connected with the end of oppisite phase of the 3rd operational amplifier by resistance R 4, the end of oppisite phase of described the 3rd operational amplifier is connected with the output of the 3rd operational amplifier by resistance R 5,
Described bandwidth-limited circuit comprises four-operational amplifier, the 5th operational amplifier, resistance R 6, resistance R 3, resistance R 10, resistance R 11, resistance R 14, resistance R 21, resistance R 22, resistance R 23, capacitor C 4, capacitor C 5, capacitor C 16 and capacitor C 17, the in-phase end of described four-operational amplifier is connected with one end of resistance R 3, the other end of resistance R 3 is connected with one end of resistance R 6, the other end of resistance R 6 is connected with the output of the 3rd operational amplifier, one end of described resistance R 3 is connected with one end of capacitor C 5, the other end ground connection of capacitor C 5, the end of oppisite phase of described four-operational amplifier is by resistance R 10 ground connection, the end of oppisite phase of described four-operational amplifier is also connected with one end of capacitor C 16 by resistance R 11, the other end of described capacitor C 16 is connected with one end of capacitor C 17, the other end of capacitor C 17 is connected with the in-phase end of the 5th operational amplifier, the in-phase end of described the 5th operational amplifier is by resistance R 21 ground connection, the end of oppisite phase of described the 5th operational amplifier is by resistance R 22 ground connection, the end of oppisite phase of the 5th operational amplifier is connected with the output of the 5th operational amplifier by resistance R 23, the output of described the 5th operational amplifier is connected with the other end of capacitor C 16 by resistance R 14,
Described waveform shaping circuit comprises the 6th operational amplifier, resistance R 24, resistance R 25 and capacitor C 21, the in-phase end of described the 6th operational amplifier is connected with one end of resistance R 25, the other end of resistance R 25 is connected with the output of the 5th operational amplifier, the end of oppisite phase ground connection of described the 6th operational amplifier, the output of described the 6th operational amplifier is connected with one end of capacitor C 21 by resistance R 24, the other end ground connection of described capacitor C 21; Described the 6th output of operational amplifier and the input of analog multiplier are connected;
Described phase-shift circuit comprises the 7th operational amplifier, the 8th operational amplifier, resistance R 1, adjustable resistance R8, resistance R 9, adjustable resistance R16, resistance R 17, resistance R 20, capacitor C 6 and capacitor C 15; Described the 7th operational amplifier in-phase end is connected with one end of capacitor C 6, the other end of described capacitor C 6 is connected with the output of the 5th operational amplifier, described the 7th operational amplifier in-phase end is also by resistance R 1 ground connection, the end of oppisite phase of described the 7th operational amplifier is connected with one end of adjustable resistance R8, the other end of described adjustable resistance R8 is connected with the output of the 5th operational amplifier, the end of oppisite phase of the 7th operational amplifier is also connected with one end of resistance R 9, and the other end of resistance R 9 is connected with the output of the 7th operational amplifier; The other end of described resistance R 9 is connected with one end of adjustable resistance R16, the other end of resistance R 9 is also connected with one end of resistance R 17, the other end of described adjustable resistance R16 is connected with the in-phase end of the 8th operational amplifier, the other end of described resistance R 17 is connected with the in-phase end of the 8th operational amplifier, the in-phase end of described the 8th operational amplifier is also by capacitor C 15 ground connection, and the end of oppisite phase of described the 8th operational amplifier is connected with the output of the 8th operational amplifier by resistance R 20; Described the 8th output of operational amplifier and the input of analog multiplier are connected;
Described low-pass filter circuit comprises the 9th operational amplifier, resistance R 27, resistance R 28, resistance R 29, resistance R 30, capacitor C 23 and capacitor C 25, the in-phase end of described the 9th operational amplifier is connected with one end of resistance R 28, the other end of resistance R 28 is connected with one end of resistance R 27, the other end of described resistance R 27 is connected with the output of analog multiplier, the in-phase end of described the 9th operational amplifier is by capacitor C 25 ground connection, the end of oppisite phase of described the 9th operational amplifier is by resistance R 29 ground connection, the end of oppisite phase of described the 9th operational amplifier is connected with the output of the 9th operational amplifier by resistance R 30, the output of described the 9th operational amplifier is connected with the other end of resistance R 28 by capacitor C 23, the output of described the 9th operational amplifier is connected with AD converter, and described AD converter is connected with display.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320762787.6U CN203859727U (en) | 2013-11-28 | 2013-11-28 | Device for detecting weak signals |
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| CN201320762787.6U CN203859727U (en) | 2013-11-28 | 2013-11-28 | Device for detecting weak signals |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763163A (en) * | 2016-02-02 | 2016-07-13 | 合肥工业大学智能制造技术研究院 | Novel ultrahigh frequency weak signal combined amplification circuit |
| CN106840470A (en) * | 2017-01-19 | 2017-06-13 | 北京机械设备研究所 | A kind of bridge type pressure sensor output signal harvester and method |
| CN109425366A (en) * | 2017-09-04 | 2019-03-05 | 南京理工大学 | A kind of analog signal processing circuit for active optics micro-displacement sensor |
| CN112798100A (en) * | 2021-02-04 | 2021-05-14 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Generator stator winding end vibration on-line monitoring device and monitoring method thereof |
-
2013
- 2013-11-28 CN CN201320762787.6U patent/CN203859727U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105763163A (en) * | 2016-02-02 | 2016-07-13 | 合肥工业大学智能制造技术研究院 | Novel ultrahigh frequency weak signal combined amplification circuit |
| CN105763163B (en) * | 2016-02-02 | 2018-07-03 | 合肥工业大学智能制造技术研究院 | A kind of superelevation frequency weak signal combined amplifier |
| CN106840470A (en) * | 2017-01-19 | 2017-06-13 | 北京机械设备研究所 | A kind of bridge type pressure sensor output signal harvester and method |
| CN106840470B (en) * | 2017-01-19 | 2019-06-07 | 北京机械设备研究所 | A kind of bridge type pressure sensor output signal acquisition device and method |
| CN109425366A (en) * | 2017-09-04 | 2019-03-05 | 南京理工大学 | A kind of analog signal processing circuit for active optics micro-displacement sensor |
| CN112798100A (en) * | 2021-02-04 | 2021-05-14 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Generator stator winding end vibration on-line monitoring device and monitoring method thereof |
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Granted publication date: 20141001 Termination date: 20151128 |