CN102455239B - Method utilizing phase-locking amplifier to detect weak signals of dynamic balancer and device for method - Google Patents
Method utilizing phase-locking amplifier to detect weak signals of dynamic balancer and device for method Download PDFInfo
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- CN102455239B CN102455239B CN 201010524527 CN201010524527A CN102455239B CN 102455239 B CN102455239 B CN 102455239B CN 201010524527 CN201010524527 CN 201010524527 CN 201010524527 A CN201010524527 A CN 201010524527A CN 102455239 B CN102455239 B CN 102455239B
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Abstract
The invention discloses an implementation device for a method utilizing a phase-locking amplifier to detect weak signals of a dynamic balancer. The device comprises a signal processing circuit, a microprocessor circuit, an analog switch circuit, a passive lowpass filter circuit, a calibration/ measurement switch and a data transmission circuit, wherein the signal processing circuit receives the weak signal output by the dynamic balancer and can carry out forward and reverse amplification on the signals; meanwhile, a reference signal Sref is magnified and reshaped to obtain a square signal as a switch of a chopping wave; the microprocessor circuit receives the square signal from the signal processing circuit so as to carry out adjustment on the time of the analog switch circuit; and the passive lowpass filter circuit receives the output signals of the analog switch, and the data transmission circuit transmits the output signals of the calibration/ measurement switch to a PC (personal computer) machine through a USB (universal serial bus) interface. The implementation device provided by the invention has the advantages of low cost, high detecting precision and low deviation.
Description
Technical field
The present invention relates to dynamic balancing machine technology, Technique of Weak Signal Detection, specifically a kind of with method and the device of lock-in amplifier to the dynamic balancing machine Detection of Weak Signals.
Background technology
Dynamic balancing machine is for the equipment of measuring rotor unbalance value, and by its measurement result rotor is proofreaied and correct, and to improve the mass distribution of rotor, the vibration when rotor is rotated or the power that acts on bearing reduce to and allows in the usable range.In the structure of dynamic balancing machine, lock-in amplifier (lock in amplifier, LIA) is one of necessary instrument that carries out Detection of Weak Signals.Simulation LIA and two kinds of main lock-in amplifiers of digital LIA are arranged at present, LIA is cheap temperature drift but wherein simulate, numeral LIA precision high but generally will be with digital signal processor or extensive Programmable Logic Device, cost is very high, for above situation, a kind of dynamic balancing machine has just had significance with the proposition of lock-in amplifier method for designing and device.
Summary of the invention
For the deficiencies in the prior art part, the technical problem to be solved in the present invention provides a kind of low cost, low deviation, high-precision a kind of with method and the device of lock-in amplifier to the dynamic balancing machine Detection of Weak Signals.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of with the method for lock-in amplifier to the dynamic balancing machine Detection of Weak Signals,
Principle of work is:
(1), establishing reference signal is S
Ref=a*cos (ω t), measured signal is S
In=b*cos (ω t+ φ), the product of two signals is so: S
Mult=S
Ref* S
In=-0.5*a*b* (cos (2 ω t)+cos (φ));
(2), utilize the signal of passive low ventilating filter filtering 2 ω t and higher frequency, and suppose that wave filter has desirable frequency response, get S
Out=-0.5*a*b*cos (φ), i.e. S
OutFor only being subjected to the signal of cos (φ) modulation, by the phase place official post φ between adjustment reference signal and the measured signal=0, can obtain maximum output S
Outmax=-0.5*a*b;
Measuring process is:
The first step is to S
InSignal carries out chopping modulation, namely utilizes analog switch with S
InCarry out positive and negative both direction copped wave, the switch of described copped wave is by S
RefSignal provides through shaping;
Second step carries out low-pass filtering with the output signal of chopping modulation in the first step again, obtains the output S of lock-in amplifier
Out, microprocessor utilizes analog-to-digital conversion module to gather this output, and by transmission interface with transmitting measured values to PC.
Comprise that calibration process is:
With S
RefAmplify the access analog comparator, as the interrupting input of microprocessor, then utilize timer that this signal is shifted to output as the switching signal of analog switch, then analog to digital converter constantly gathers the output S of lock-in amplifier
Out, at a time, this is output as maximum, and calibration finishes, and microprocessor records is somebody's turn to do phase shift constantly, and with its standard as this measurement, calibration operation finishes.
A kind of with the implement device of lock-in amplifier to the method for dynamic balancing machine Detection of Weak Signals, comprising: signal processing circuit, microcontroller circuit, analog switching circuit, passive low-pass filter circuit, calibration/measuring switch and data transmission circuit;
Described signal processing circuit receives the feeble signal of dynamic balancing machine output, and this signal is carried out positive and negative both direction amplify, and described signal processing circuit is simultaneously with reference to signal S
RefAmplification also is shaped to square-wave signal as the switch of copped wave;
Described microcontroller circuit receives the square-wave signal from signal processing circuit, take this signal as the benchmark microcontroller circuit to adjusting the opportunity of analog switch; Described analog switch receives the switching signal from microcontroller circuit, and described analog switch is selected forward signal or reverse signal output; Described passive low-pass filter circuit receives the analog switch output signal, and the output signal of analog switch is carried out low-pass filtering, removes the high fdrequency component in this output signal; Described calibration/measuring switch receives the signal of analog switch, carries out gating calibration or measurement; Described data transmission circuit will calibrate/and the output signal of measuring switch transfers to PC by USB interface.
The control flow of described microcontroller circuit is:
After system powers on,
Testing calibration/measuring switch judges it is calibration, or measures;
If for calibration, then judge whether to carry out analog to digital conversion; If be no, then calibration is finished;
If be yes, then carry out phase place adjustment and calibration, calibration is finished; After finishing, calibration measures;
If for measuring, then judge whether to carry out analog to digital conversion; If be no, then measure and finish; If be yes, then measure and data transmission, measure at last and finish;
Export measurement result to PC.
The present invention has following beneficial effect and advantage:
1. low-cost; The present invention utilizes analog switch at a high speed and cheap microprocessor to be used in conjunction with, and has avoided expensive digital signal processor and extensive logical circuit, thereby has reduced cost.
2. low deviation; The present invention has used high-precision adc to carry out phase alignment, has reduced the locking deviation.
3. high precision; The present invention utilizes the switch opportunity of digital technology control simulation switch, thereby the phase differential of control source signal and reference signal improves control accuracy.
Description of drawings
Fig. 1 is apparatus of the present invention principle of work schematic diagram;
Fig. 2 is apparatus of the present invention measuring principle schematic diagram;
Fig. 3 is apparatus of the present invention calibrating principle schematic diagram;
Fig. 4 is apparatus of the present invention circuit theory schematic diagram;
Fig. 5 is apparatus of the present invention control flow schematic diagram.
Embodiment
As shown in Figure 1, 2, a kind of with the method for lock-in amplifier to the dynamic balancing machine Detection of Weak Signals, principle of work is:
(1), establishing reference signal is S
Ref=a*cos (ω t), measured signal is S
In=b*cos (ω t+ φ), the product of two signals is so: S
Mult=S
Ref* S
In=-0.5*a*b* (cos (2 ω t)+cos (φ));
(2), utilize the signal of passive low ventilating filter filtering 2 ω t and higher frequency, and suppose that wave filter has desirable frequency response, get S
Out=-0.5*a*b*cos (φ), i.e. S
OutFor only being subjected to the signal of cos (φ) modulation, by the phase place official post φ between adjustment reference signal and the measured signal=0, can obtain maximum output S
Outmax=-0.5*a*b.
Measuring process is:
The first step is to S
InSignal carries out chopping modulation, namely utilizes analog switch with S
InCarry out positive and negative both direction copped wave, the switch of described copped wave is by S
RefSignal provides through shaping;
Second step carries out low-pass filtering with the output signal of chopping modulation in the first step again, obtains the output S of lock-in amplifier
Out, microprocessor utilizes analog-to-digital conversion module to gather this output, and by transmission interface with transmitting measured values to PC.
As shown in Figure 3, the present invention comprises that also calibration process is: with S
RefAmplify the access analog comparator, as the interrupting input of microprocessor, then utilize timer that this signal is shifted to output as the switching signal of analog switch, then analog to digital converter constantly gathers the output S of lock-in amplifier
Out, at a time, this is output as maximum, and calibration finishes, and microprocessor records is somebody's turn to do phase shift constantly, and with its standard as this measurement, calibration operation finishes.
As shown in Figure 4, implement device of the present invention comprises: signal processing circuit, microcontroller circuit, analog switching circuit, passive low-pass filter circuit, calibration/measuring switch and data transmission circuit; Described signal processing circuit receives the feeble signal of dynamic balancing machine output, and this signal is carried out positive and negative both direction amplify, and described signal processing circuit is simultaneously with reference to signal S
RefAmplification also is shaped to square-wave signal as the switch of copped wave; Described microcontroller circuit receives the square-wave signal from signal processing circuit, take this signal as the benchmark microcontroller circuit to adjusting the opportunity of analog switch; Described analog switch receives the switching signal from microcontroller circuit, and described analog switch is selected forward signal or reverse signal output; Described passive low-pass filter circuit receives the analog switch output signal, and the output signal of analog switch is carried out low-pass filtering, removes the high fdrequency component in this output signal; Described calibration/measuring switch receives the signal of analog switch, carries out gating calibration or measurement; Described data transmission circuit will calibrate/and the output signal of measuring switch transfers to PC by USB interface.
As shown in Figure 5, in the implement device of the present invention, the control flow of described microcontroller circuit is:
After system powers on,
Testing calibration/measuring switch judges it is calibration, or measures;
If for calibration, then judge whether to carry out analog to digital conversion; If be no, then calibration is finished;
If be yes, then carry out phase place adjustment and calibration, calibration is finished; After finishing, calibration measures;
If for measuring, then judge whether to carry out analog to digital conversion; If be no, then measure and finish; If be yes, then measure and data transmission, measure at last and finish;
By USB measurement result is sent to PC until finish measurement at last.
Claims (4)
1. one kind with the method for lock-in amplifier to the dynamic balancing machine Detection of Weak Signals, it is characterized in that:
Principle of work is:
(1), establishing reference signal is S
Ref=a*cos (ω t), measured signal is S
In=b*cos (ω t+ φ), the product of two signals is so: S
Mult=S
Ref* S
In=-0.5*a*b* (cos (2 ω t)+cos (φ));
(2), utilize the signal of passive low ventilating filter filtering 2 ω t and higher frequency, and suppose that wave filter has desirable frequency response, get S
Out=-0.5*a*b*cos (φ), i.e. S
OutFor only being subjected to the signal of cos (φ) modulation, by the phase place official post φ between adjustment reference signal and the measured signal=0, can obtain maximum output S
Outmax=-0.5*a*b;
Measuring process is:
The first step is to S
InSignal carries out chopping modulation, namely utilizes analog switch with S
InCarry out positive and negative both direction copped wave, the switch of described copped wave is by S
RefSignal provides through shaping;
Second step carries out low-pass filtering with the output signal of chopping modulation in the first step again, obtains the output S of lock-in amplifier
Out, microprocessor utilizes analog-to-digital conversion module to gather this output, and by transmission interface with transmitting measured values to PC.
2. by claimed in claim 1 a kind of with the method for lock-in amplifier to the dynamic balancing machine Detection of Weak Signals, it is characterized in that: comprise that calibration process is:
With S
RefAmplify the access analog comparator, as the interrupting input of microprocessor, then utilize timer that this signal is shifted to output as the switching signal of analog switch, then analog to digital converter constantly gathers the output S of lock-in amplifier
Out, at a time, this is output as maximum, and calibration finishes, and microprocessor records is somebody's turn to do phase shift constantly, and with its standard as this measurement, calibration operation finishes.
3. by claimed in claim 1 a kind of with the implement device of lock-in amplifier to the method for dynamic balancing machine Detection of Weak Signals, it is characterized in that:
Comprise: signal processing circuit, microcontroller circuit, analog switching circuit, passive low-pass filter circuit, calibration/measuring switch and data transmission circuit;
Described signal processing circuit receives the feeble signal of dynamic balancing machine output, and this signal is carried out positive and negative both direction amplify, and described signal processing circuit is simultaneously with reference to signal S
RefAmplification also is shaped to square-wave signal as the switch of copped wave;
Described microcontroller circuit receives the square-wave signal from signal processing circuit, take this signal as the benchmark microcontroller circuit to adjusting the opportunity of analog switch; Described analog switch receives the switching signal from microcontroller circuit, and described analog switch is selected forward signal or reverse signal output; Described passive low-pass filter circuit receives the analog switch output signal, and the output signal of analog switch is carried out low-pass filtering, removes the high fdrequency component in this output signal; Described calibration/measuring switch receives the signal of analog switch, carries out gating calibration or measurement; Described data transmission circuit will calibrate/and the output signal of measuring switch transfers to PC by USB interface.
4. by claimed in claim 3 a kind of with the implement device of lock-in amplifier to the dynamic balancing machine method for detecting weak signals, it is characterized in that:
The control flow of described microcontroller circuit is:
After system powers on,
Testing calibration/measuring switch judges it is calibration, or measures;
If for calibration, then judge whether to carry out analog to digital conversion; If be no, then calibration is finished;
If be yes, then carry out phase place adjustment and calibration, calibration is finished; After finishing, calibration measures;
If for measuring, then judge whether to carry out analog to digital conversion; If be no, then measure and finish; If be yes, then measure and data transmission, measure at last and finish;
Export measurement result to PC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010524527 CN102455239B (en) | 2010-10-29 | 2010-10-29 | Method utilizing phase-locking amplifier to detect weak signals of dynamic balancer and device for method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010524527 CN102455239B (en) | 2010-10-29 | 2010-10-29 | Method utilizing phase-locking amplifier to detect weak signals of dynamic balancer and device for method |
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| CN102455239A CN102455239A (en) | 2012-05-16 |
| CN102455239B true CN102455239B (en) | 2013-09-18 |
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| CN 201010524527 Expired - Fee Related CN102455239B (en) | 2010-10-29 | 2010-10-29 | Method utilizing phase-locking amplifier to detect weak signals of dynamic balancer and device for method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103076174B (en) * | 2013-01-01 | 2015-10-28 | 北京工业大学 | A kind of bearing fault based on lock-in amplify algorithm and fault degree diagnostic method |
| CN104820145B (en) * | 2015-04-16 | 2018-01-26 | 中国科学院物理研究所 | For the tester and its method of testing tested lock-in amplifier |
| CN104819843A (en) * | 2015-05-17 | 2015-08-05 | 成都诚邦动力测试仪器有限公司 | Gearbox testing system of signal offset amplification type based on phase-locked loop control |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4128284C2 (en) * | 1991-08-27 | 1994-12-22 | Zam Ev | Circuit for processing a useful signal picked up by a sensor and weak in comparison to an interference signal |
| CN201166263Y (en) * | 2008-03-21 | 2008-12-17 | 东南大学 | Full optical fiber destabilization sensing weak signal detection module |
| CN201210058Y (en) * | 2008-06-06 | 2009-03-18 | 秦一涛 | Weak current and voltage conversion circuit |
| CN201247066Y (en) * | 2008-06-04 | 2009-05-27 | 中国科学院沈阳自动化研究所 | Apparatus for rapidly extracting small signal |
| CN201983903U (en) * | 2010-10-29 | 2011-09-21 | 中国科学院沈阳自动化研究所 | Device for detecting small signal of dynamic balancing machine by using lock-in amplifier |
-
2010
- 2010-10-29 CN CN 201010524527 patent/CN102455239B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4128284C2 (en) * | 1991-08-27 | 1994-12-22 | Zam Ev | Circuit for processing a useful signal picked up by a sensor and weak in comparison to an interference signal |
| CN201166263Y (en) * | 2008-03-21 | 2008-12-17 | 东南大学 | Full optical fiber destabilization sensing weak signal detection module |
| CN201247066Y (en) * | 2008-06-04 | 2009-05-27 | 中国科学院沈阳自动化研究所 | Apparatus for rapidly extracting small signal |
| CN201210058Y (en) * | 2008-06-06 | 2009-03-18 | 秦一涛 | Weak current and voltage conversion circuit |
| CN201983903U (en) * | 2010-10-29 | 2011-09-21 | 中国科学院沈阳自动化研究所 | Device for detecting small signal of dynamic balancing machine by using lock-in amplifier |
Non-Patent Citations (4)
| Title |
|---|
| 基于双相锁相放大器的微弱信号矢量测量;蔡屹;《微计算机信息》;20070905;111-112 * |
| 微弱信号检测技术;章克来等;《航空电子技术》;20090615;第40卷(第2期);30-36 * |
| 章克来等.微弱信号检测技术.《航空电子技术》.2009,第40卷(第2期),30-36. |
| 蔡屹.基于双相锁相放大器的微弱信号矢量测量.《微计算机信息》.2007,111-112. |
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