CN104748655A - Device and method for quickly calibrating LVDT signal demodulation circuit - Google Patents
Device and method for quickly calibrating LVDT signal demodulation circuit Download PDFInfo
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- CN104748655A CN104748655A CN201510097407.5A CN201510097407A CN104748655A CN 104748655 A CN104748655 A CN 104748655A CN 201510097407 A CN201510097407 A CN 201510097407A CN 104748655 A CN104748655 A CN 104748655A
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Abstract
The invention provides a device for quickly calibrating an LVDT signal demodulation circuit. The device comprises a standard sinusoidal signal generator, a signal amplifying circuit, a parameter adjusting resistance, a waveband switch, a demodulation circuit, a demodulation circuit to be calibrated and an acquisition terminal, wherein the standard sinusoidal signal generator is connected with the signal amplifying circuit, and the parameter adjusting resistance is connected in series with the waveband switch and then connected with the signal amplifying circuit; the signal amplifying circuit is connected with the demodulation circuit to be calibrated, the demodulation circuit to be calibrated is connected with the demodulation circuit, and the demodulation circuit is connected with the acquisition terminal. According to the device, a simulative LVDT standard sinusoidal analog signal is injected into the demodulation circuit to be calibrated and demodulated by use of the demodulation circuit, and then the demodulated signal is compared with a theoretical value to realize quick and accurate calibration of the demodulation circuit; the calibration cost is effectively reduced, and meanwhile, the automation of demodulation is realized and the working efficiency of LVDT calibration is effectively improved.
Description
Technical field
The present invention relates to differential transformers signal receiving technical field, particularly relate to a kind of LVDT signal demodulating circuit fast calibration device and method.
Background technology
Linear change differential transformers (Linear Variable Differential Transformer, be called for short LVDT) be a kind of general-purpose device for position measurement, possess the plurality of advantages such as measure linear scope is large, move contactless, reliability is high, anti-pollution, be widely used in the fields such as servo, numerical control, aviation, the voltage that LVDT produces exports and is directly proportional to the displacement of its separate type iron core; But in actual use, LVDT output signal is AC differential signal, directly cannot carry out acquisition process, usually adopts demodulator circuit ac voltage signal to be changed into the d. c. voltage signal be directly proportional to position; Because LVDT adopts without rub measurement mode, it is made to have unlimited resolution and unlimited mechanical life in theory, so the resolution of demodulator circuit often determines LVDT use resolution really, the key issue that accurate calibration also becomes LVDT displacement measurement system is carried out to demodulator circuit, and directly calibrate for demodulator circuit, need high precision measuring instrument, waste time and energy and be difficult to realize robotization.Therefore, simulation LVDT standard output signals carries out calibration becomes effective solution.
Summary of the invention
Technical matters solved by the invention is to provide a kind of LVDT signal demodulating circuit fast calibration device and method, to solve the shortcoming in above-mentioned background technology.
Technical matters solved by the invention realizes by the following technical solutions:
A kind of LVDT signal demodulating circuit fast calibration device, comprises standard sine signal generator, signal amplification circuit, tune ginseng resistance, waver, demodulator circuit, demodulator circuit to be calibrated and acquisition terminal; Wherein, quasi sine signal generator is connected with signal amplification circuit, standard sine signal generator is identical for generation of two-way amplitude, the LVDT standard sine simulating signal of phase differential 180 °, and be connected with signal amplification circuit after adjusting ginseng resistance and waver being connected, by adjusting ginseng resistance and waver, tune is carried out to signal amplification circuit and join to generate two-way standard LVDT secondary coil signal; Signal amplification circuit is connected with demodulator circuit to be calibrated, the simulation LVDT standard sine output signal generated is injected demodulator circuit to be calibrated, demodulator circuit to be calibrated is connected with demodulator circuit, numerical value is demodulated by demodulator circuit, demodulator circuit is connected with acquisition terminal, acquisition terminal can realize calibration to LVDT demodulator circuit after being contrasted by the numerical value and theoretical value gathering demodulator circuit demodulation fast.
In the present invention, demodulator circuit place is provided with High Precision Multimeter, to measure magnitude of voltage after demodulation.
In the present invention, acquisition terminal tail end is provided with display terminal, and display terminal is for showing the numerical value after calibration.
A kind of LVDT signal demodulating circuit quick calibration method, injects demodulator circuit to be calibrated by the LVDT standard sine simulating signal of simulation, by demodulator circuit demodulation, then signal after demodulation and theoretical value is contrasted, realize the quickly calibrated of demodulator circuit; Concrete steps are as follows:
1) two-way LVDT standard sine simulating signal is produced by standard sine signal generator, and by two-way LVDT standard sine simulating signal access signal amplification circuit;
2) utilize tune ginseng resistance and waver to carry out tune to the two-way LVDT standard sine simulating signal accessed in signal amplification circuit to join, to generate two-way standard LVDT secondary coil signal;
3) by step 2) the middle two-way standard LVDT secondary coil signal injection demodulator circuit to be calibrated generated;
4) numerical value is demodulated by demodulator circuit;
5) acquisition terminal acquisition step 4) in the numerical value that demodulates, and after contrasting with theoretical value, calibration can be realized to LVDT demodulator circuit fast.
In the present invention, the two-way LVDT standard sine simulating signal generated in step 1) is that amplitude is identical, phase differential 180 °.
In the present invention, when the motion of iron core is no more than within the scope of coil mechanism, LVDT exports has the very high linearity, during calibration, only need choose one group of representative value carry out measurement and can meet calibration requirements at acquisition terminal.
In the present invention, because the calibration of LVDT signal demodulating circuit requires relatively stricter to the frequency of LVDT simulating signal, phase equalization, therefore in step 1), signal amplification circuit is set to binary channels, with ensure signal amplify after consistance.
Beneficial effect: the present invention by the LVDT standard sine simulating signal of simulation is injected demodulator circuit to be calibrated, and passes through demodulator circuit demodulation, then signal after demodulation and theoretical value is contrasted, to realize the quick accurate calibration of demodulator circuit; Effectively reduce calibration cost, achieve the robotization of demodulation simultaneously, effectively improve LVDT calibration operation efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of preferred embodiment of the present invention.
Fig. 2 is that the standard sine signal generator in preferred embodiment of the present invention produces standard sine analogue signal circuit figure.
Fig. 3 is demodulator circuit signal 1 schematic diagram to be calibrated in preferred embodiment of the present invention.
Fig. 4 is demodulator circuit signal 2 schematic diagram to be calibrated in preferred embodiment of the present invention.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
See a kind of LVDT signal demodulating circuit fast calibration device of Fig. 1, comprise standard sine signal generator 1, signal amplification circuit 2, adjust ginseng resistance 3, waver 4, demodulator circuit 5, demodulator circuit to be calibrated 6, acquisition terminal 7 and display terminal 8; Wherein, standard sine signal generator 1 produces that two-way amplitude is identical, the LVDT standard sine simulating signal of phase differential 180 °, utilize and adjust ginseng resistance 3 to join with the tune of waver 4 pairs of signal amplification circuits 2, generate two-way standard LVDT secondary coil signal, and signal amplification circuit 2 is connected with demodulator circuit 6 to be calibrated, the LVDT standard sine of simulation output signal is injected demodulator circuit 6 to be calibrated, demodulator circuit 6 to be calibrated is connected with demodulator circuit 5, demodulator circuit 5 place is provided with High Precision Multimeter, to measure magnitude of voltage after demodulation; Acquisition terminal 7 gathers after numerical value and theoretical value that demodulator circuit 5 exports contrast, can realize calibrating to LVDT demodulator circuit fast, and be shown at display terminal 8 by the numerical value after calibrating.
In the present embodiment, when the motion of iron core is no more than within the scope of coil mechanism, LVDT exports has the very high linearity, only need choose one group of representative value (generally containing LVDT maximum output voltage and total null voltage) and carry out measurement and can meet calibration requirements during calibration.
Shown in Fig. 2 ~ Fig. 4, LVDT signal demodulating circuit quick calibration method, two-way amplitude is produced identical by standard sine signal generator 1, the LVDT standard sine simulating signal of phase differential 180 °, through signal amplification circuit 2, the LVDT standard sine simulating signal produced is amplified, and utilize tune ginseng resistance 3 and waver 4 pairs of signal amplification circuits 2 to adjust ginseng, generate two-way standard LVDT secondary coil signal injection demodulator circuit 6 to be calibrated, magnitude of voltage after High Precision Multimeter measurement demodulation through demodulator circuit 5 place, gathered by acquisition terminal 7 and contrast with theoretical value, calibration can be realized fast to LVDT demodulator circuit.
Because the calibration of LVDT signal demodulating circuit requires relatively stricter to the frequency of LVDT simulating signal, phase equalization, therefore signal amplification circuit 2 adopts binary channels to arrange with the consistance ensured after signal amplification.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof
.
Claims (6)
1. a LVDT signal demodulating circuit fast calibration device, comprises standard sine signal generator, signal amplification circuit, tune ginseng resistance, waver, demodulator circuit, demodulator circuit to be calibrated and acquisition terminal; It is characterized in that, quasi sine signal generator is connected with signal amplification circuit, and is connected with signal amplification circuit after adjusting ginseng resistance and waver being connected; Signal amplification circuit is connected with demodulator circuit to be calibrated, and demodulator circuit to be calibrated is connected with demodulator circuit, and demodulator circuit is connected with acquisition terminal.
2. a kind of LVDT signal demodulating circuit fast calibration device according to claim 1, it is characterized in that, demodulator circuit place is provided with High Precision Multimeter.
3. a kind of LVDT signal demodulating circuit fast calibration device according to claim 1, it is characterized in that, acquisition terminal tail end is provided with display terminal.
4. a LVDT signal demodulating circuit quick calibration method, is characterized in that, concrete steps are as follows:
1) two-way LVDT standard sine simulating signal is produced by standard sine signal generator, and by two-way LVDT standard sine simulating signal access signal amplification circuit;
2) utilize tune ginseng resistance and waver to carry out tune to the two-way LVDT standard sine simulating signal accessed in signal amplification circuit to join, to generate two-way standard LVDT secondary coil signal;
3) by step 2) the middle two-way standard LVDT secondary coil signal injection demodulator circuit to be calibrated generated;
4) numerical value is demodulated by demodulator circuit;
5) acquisition terminal acquisition step 4) in the numerical value that demodulates, and after contrasting with theoretical value, calibration can be realized to LVDT demodulator circuit fast.
5. a kind of LVDT signal demodulating circuit quick calibration method according to claim 4, is characterized in that, the two-way LVDT standard sine simulating signal generated in step 1) is that amplitude is identical, phase differential 180 °.
6. a kind of LVDT signal demodulating circuit quick calibration method according to claim 4, it is characterized in that, in step 1), signal amplification circuit is set to binary channels.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510097407.5A CN104748655A (en) | 2015-03-05 | 2015-03-05 | Device and method for quickly calibrating LVDT signal demodulation circuit |
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| CN201510097407.5A CN104748655A (en) | 2015-03-05 | 2015-03-05 | Device and method for quickly calibrating LVDT signal demodulation circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105758438A (en) * | 2016-03-04 | 2016-07-13 | 江西洪都航空工业集团有限责任公司 | Quick calibration device for LVDT signal demodulation circuit |
| CN111006575A (en) * | 2019-12-06 | 2020-04-14 | 江西洪都航空工业集团有限责任公司 | Linear variable differential transformer signal generating device |
| CN114136345A (en) * | 2021-11-26 | 2022-03-04 | 南京晨光集团有限责任公司 | LVDT/RVDT analog demodulation circuit |
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2015
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| CN105758438A (en) * | 2016-03-04 | 2016-07-13 | 江西洪都航空工业集团有限责任公司 | Quick calibration device for LVDT signal demodulation circuit |
| CN111006575A (en) * | 2019-12-06 | 2020-04-14 | 江西洪都航空工业集团有限责任公司 | Linear variable differential transformer signal generating device |
| CN114136345A (en) * | 2021-11-26 | 2022-03-04 | 南京晨光集团有限责任公司 | LVDT/RVDT analog demodulation circuit |
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Application publication date: 20150701 |