CN102759366B - Detection device of optical fiber gyroscope optical module - Google Patents
Detection device of optical fiber gyroscope optical module Download PDFInfo
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- CN102759366B CN102759366B CN201210240569.6A CN201210240569A CN102759366B CN 102759366 B CN102759366 B CN 102759366B CN 201210240569 A CN201210240569 A CN 201210240569A CN 102759366 B CN102759366 B CN 102759366B
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Abstract
The invention provides a detection device of an optical fiber gyroscope optical module. The detection device comprises a photoelectric conversion module, a synchronous detector, a low pass filer, a PZT (piezoelectric ceramic transducer) controller, a peak value wave detection circuit, an A/D (analog to digital) converter, a light source detector and a display, wherein the photoelectric conversion module is connected with the A/D converter through the synchronous detector and the low pass filer; the photoelectric conversion module is further connected with an optical fiber coupler on the optical module; the PZT controller is connected with the A/D converter through the peak value wave detection circuit, and meanwhile, the PZT controller is further connected with a PZT on the optical module; and the light source detector is respectively connected with a light source on the light source module and the A/D converter. The device can meet the measurement requirements of zero offset/zero offset orthogonality value of the optical fiber gyroscope, light source current and signals on the PZT; and the detection device of the optical fiber gyroscope optical module is simple and convenient to use, and is low in production cost.
Description
Technical field
The present invention relates to a kind of pick-up unit of fibre optic gyroscope optical module, belong to fibre optic gyroscope technical field of performance test.
Background technology
Fibre optic gyroscope is a kind of rate of acceleration sensor, is widely used in inertial navigation field, is at present for determining the main sensors of moving object spatial movement attitude.Optical module is as the important component part in fibre optic gyroscope, and its performance directly has influence on the sensitivity of fibre optic gyroscope.
Optical module on fibre optic gyroscope comprises light source, fiber optic loop, fiber coupler, light source polarizer and piezoelectric ceramics controller (PZT); The light that wherein light source sends becomes polarized light after light source polarizer.Polarized light was propagated after one week in fiber optic loop, added after a biasing phase place at PZT, and the light after biasing is transferred to fiber coupler, and fiber coupler is coupled and transfers out the light receiving.
Because the size of source current is directly connected to the normal work of gyro, and when source current is excessive, be easy to cause light source to burn, cause the increase of production cost and the prolongation of production cycle, therefore for source current, monitoring is an important step in fibre optic gyroscope production run.
PZT voltage, electric current are directly connected to the degree of depth of phase-modulation, and therefore, it is a very crucial factor that realizes the accurate detection of rotating signal that PZT is operated under suitable electric current and voltage.
But, currently also do not exist a proving installation sleeve forming, easy in the reception test of fibre optic gyroscope optical module, to use.
Summary of the invention
The object of the invention is to propose a kind of pick-up unit of fibre optic gyroscope optical module, this device can meet to optical fibre gyro zero partially/the test needs of signal on zero inclined to one side quadrature value, source current and PZT, it is easy to use.
Realize technical scheme of the present invention as follows:
A pick-up unit for fibre optic gyroscope optical module, utilizes in the process that this pick-up unit detects optical module, and fibre optic gyroscope remains static; This pick-up unit comprises photoelectric conversion module, synchronizing indicator, low-pass filter, PZT controller, peak-detector circuit, A/D converter, light source detection device and display; Wherein, photoelectric conversion module connects successively synchronizing indicator and is connected with A/D converter after low-pass filter, and photoelectric conversion module is further connected with the fiber coupler on optical module; PZT controller is connected with A/D converter by peak-detector circuit, and PZT controller is further connected with the PZT on optical module simultaneously; Light source detection device is connected respectively with A/D converter with the light source on light source module;
The light signal that photoelectric conversion module is exported for receiving fiber coupler, and be translated into electrical signal transfer to synchronizing indicator;
Synchronizing indicator determines it is to detect the No. of believing one side only zero or zero inclined to one side orthogonal signal according to outside input, in the time detecting the No. of believing one side only zero, the electric signal that synchronizing indicator transmits photoelectricity receiver module amplifies, obtain the No. of believing one side only zero and be transferred to low-pass filter, in the time detecting zero inclined to one side orthogonal signal, the electric signal that synchronizing indicator transmits photoelectricity receiver module amplifies and 90 ° of phase shifts, obtains zero inclined to one side orthogonal signal and is transferred to low-pass filter;
Low-pass filter carries out filtering to the signal receiving, and filtered signal is transferred to A/D converter;
PZT controller determines it is alternating voltage or the alternating current that gathers PZT according to outside input, and gathered AC signal is transferred to peak-detector circuit;
Peak-detector circuit carries out peak detection for direct current signal that PZT is transmitted, by the peak transmission of obtaining to A/D converter;
Described peak-detector circuit comprises switching diode BAV70, capacitor C 5, capacitor C 6, resistance R 60, resistance R 61 and resistance R 62; Wherein, one end of capacitor C 5 is connected with PZT controller, and the other end of capacitor C 5 is connected with direct supply by resistance R 60, is connected with A/D converter by resistance R 61, and be connected with an input end of switching diode BAV70, the output terminal of the diode BAV70 that opens the light is by resistance R 62 ground connection; This peak-detector circuit further passes through capacitor C 6 ground connection at resistance R 61 and the link of A/D converter, and another input end of switching diode BAV70 is further connected with reference power source U;
Light source detection module is for gathering the electric current of light source on light source module, and by gathered current signal transfer to A/D converter;
A/D converter is for carrying out analog to digital conversion by the signal of reception, and by the digital data transmission being converted to display;
Display shows the digital signal receiving.
Beneficial effect
The present invention by the electric current to optical module power source, PZT voltage/current and optical module output zero partially/zero inclined to one side orthogonal signal detect and show, whether staff can judge optical module according to the signal showing breaks down, and is convenient to take appropriate measures optical module is placed under repair targetedly rapidly.
Brief description of the drawings
Fig. 1 is the schematic diagram of the pick-up unit of fibre optic gyroscope optical module of the present invention.
Fig. 2 is peak-detector circuit schematic diagram.
Concrete using method
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Because the size of source current is directly connected to the normal work of gyro, and when source current is excessive, be easy to cause light source to burn, cause the increase of production cost and the prolongation of production cycle, therefore for source current, monitoring is an important step in fibre optic gyroscope production run.
PZT voltage/current is directly connected to the degree of depth of phase-modulation, and therefore, it is a very crucial factor that realizes the accurate detection of rotating signal that PZT is operated under suitable electric current and voltage.
Zero is to weigh two important indexs of fibre optic gyroscope with zero bias stability partially, especially zero bias stability of fibre optic gyroscope, and obtaining of zero bias stability need to be carried out long-term observation partially to zero, so first must obtain accurately the gyrostatic No. of believing one side only zero.Simultaneously, in actual conditions, the rotating signal of fibre optic gyroscope is the intensity variation detecting from detector, become the fundamental frequency signal of sine relation with turning rate, and in the signal obtaining at detector, tend to include a very faint fundamental frequency signal that becomes cosine relation with turning rate, this signal and gyrostatic zero partially and the correlated performance such as zero bias stability have very important relation, therefore measuring accurately this signal can be for judging that the serviceability of optical module provides a reliable foundation, and because this signal just becomes to exist the phase deviation of 90 ° with output from Gyroscope, this signal is just known as zero inclined to one side orthogonal signal.
The designed pick-up unit of the present invention can detect above-mentioned each signal, this pick-up unit as shown in Figure 1, comprises photoelectric conversion module, synchronizing indicator, low-pass filter, PZT controller, peak-detector circuit, A/D converter, light source detection device and display; Wherein, photoelectric conversion module connects successively synchronizing indicator and is connected with A/D converter after low-pass filter, and photoelectric conversion module is further connected with the fiber coupler on optical module; PZT controller is connected with A/D converter by peak-detector circuit, and PZT controller is further connected with the PZT on optical module simultaneously; Light source detection device is connected respectively with A/D converter with the light source on light source module; Utilize in the process that this pick-up unit detects optical module, fibre optic gyroscope remains static.
The light signal that photoelectric conversion module is exported for receiving fiber coupler, and be translated into electrical signal transfer to synchronizing indicator.
Because in the process that optical module is detected, optical fibre gyro remains static, if optical module is under perfect condition, it should not have signal output, if now photoelectric conversion module receives the light signal of optical module output, show that this optical module exists zero inclined to one side impact, therefore photoelectric conversion module carries out converting transmission to synchronizing indicator to the signal now receiving.
Synchronizing indicator determines it is to detect the No. of believing one side only zero or zero inclined to one side orthogonal signal according to outside input, in the time detecting the No. of believing one side only zero, the electric signal that synchronizing indicator transmits photoelectricity receiver module amplifies, obtain the No. of believing one side only zero and be transferred to low-pass filter, in the time detecting zero inclined to one side orthogonal signal, the electric signal that synchronizing indicator transmits photoelectricity receiver module amplifies and 90 ° of phase shifts, obtains zero inclined to one side orthogonal signal and is transferred to low-pass filter.
When needs obtain be the No. of believing one side only zero time, because the No. of believing one side only zero is a faint especially signal, therefore need it to amplify; Because the No. of believing one side only zero and zero inclined to one side orthogonal signal exist the phase deviation of one 90 °, therefore the No. of believing one side only zero is carried out to 90 ° of phase shifts and can obtain zero inclined to one side orthogonal signal simultaneously.
Low-pass filter carries out filtering to the signal receiving, and filtered signal is transferred to A/D converter; Utilize the noise that has impact in the low-pass filter filtering No. of believing one side only zero or zero inclined to one side orthogonal signal.
PZT controller can arrange biasing phase place to PZT, optical fibre gyro is operated on the maximum or non-vanishing point of response sensitivity, to solve the detection sensitivity of optical fibre gyro and the problem of sense of rotation, this technology is prior art, and therefore no longer this is described further.
PZT controller of the present invention gathers alternating voltage or the alternating current of PZT according to outside input, and gathered AC signal is transferred to peak-detector circuit; The present invention can arrange a single-pole double-throw (SPDT) and open the light on PZT, and the selection control by outside to switch on and off realizes not the collection to curtage in the same time.
Peak-detector circuit carries out peak detection for signal that PZT is transmitted, by the peak transmission of obtaining to A/D converter; Described peak-detector circuit comprises diode BAV70, capacitor C 5(0.1 μ F), capacitor C 6(0.1 μ F), resistance R 60(22K Ω), resistance R 61(56K Ω) and resistance R 62(1.8K Ω); Wherein, one end of capacitor C 5 is connected with PZT controller, the other end of capacitor C 5 is connected with direct supply (2.5V) by resistance R 60, be connected with A/D converter by resistance R 61, and be connected with an input end of switching diode BAV70, the output terminal of the diode BAV70 that opens the light is by resistance R 62 ground connection; This peak-detector circuit further in resistance R 61 with A/D converter link by capacitor C 6 ground connection, another input end of switching diode BAV70 U(2.5V that is further connected with reference power source) connected.
The specific works process of peak detection electric current is:
PZT controller input signal arrives the first input end (1 pin) of switching diode BAV70 through capacitance C5, then after the low-pass first order filter filtering being made up of C6 and R61, export A/D converter to, the second input end (2 pin) of switching diode BAV70 is connected to reference power source output pin.As shown in Figure 2, peak-detector circuit is output as circuit theory diagrams:
U
out=2.5V-U
in (1)
Wherein U
infor the peak value of input signal, 2.5V is reference voltage;
From formula (1), can find out, need to deduct with 2.5V the output signal U of peak-detector circuit
outcan obtain the peak value U of input signal
in.Simultaneously due to U
infor the peak value of input signal, the effective value that obtain input signal also needs to change, and this process is being calculated by single-chip microcomputer.
Can be obtained by formula (1), the input signal peak maximum of detecting circuit is 2.5V, and because the reference power source of Chip Microcomputer A/D is 2.5V, the minimum value of detecting circuit input signal peak value should be greater than 0 guarantee A/D and normally work.Therefore, the maximum PZT voltage effective value that this metering circuit can be measured is 2.5 × 0.707 ≈ 1.77V, maximum PZT current effective value is 2.5 × 0.707 × 10=17.7mA, the unit that considers PZT electric current is μ A, therefore the electric current of 10mA just cannot show, and the maximum current that therefore can measure is less than 10mA.
Light source detection module is for gathering the electric current of light source on light source module, and by gathered current signal transfer to A/D converter.
A/D converter is for carrying out analog to digital conversion by the signal of reception, and by the digital data transmission being converted to display.The information that A/D converter of the present invention receives have zero partially/zero polarization hand over, PZT voltage/current and source current, display shows above-mentioned digital signal, under normal circumstances, when above-mentioned signal meets requiring in table 1, thinks that optical module is qualified;
The required satisfied requirement of the each performance parameter of table 1
| Parameter | Value |
| PZT crest voltage | ≤1V |
| PZT peak point current | ≤500uA |
| Source current | ≤120mA |
When zero the obtained number of believing one side only is larger, represent that the precision of optical module is lower, therefore can determine zero scope partially allowable according to user's user demand.
When zero obtained inclined to one side orthogonal signal are larger, represent that the interference in optical module is larger, size that therefore can zero inclined to one side orthogonal signal judges the serviceability of optical module.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. a pick-up unit for fibre optic gyroscope optical module, utilizes in the process that this pick-up unit detects optical module, and fibre optic gyroscope remains static; It is characterized in that, this pick-up unit comprises photoelectric conversion module, synchronizing indicator, low-pass filter, PZT controller, peak-detector circuit, A/D converter, light source detection device and display; Wherein, photoelectric conversion module connects successively synchronizing indicator and is connected with A/D converter after low-pass filter, and photoelectric conversion module is further connected with the fiber coupler on optical module; PZT controller is connected with A/D converter by peak-detector circuit, and PZT controller is further connected with the PZT on optical module simultaneously; Light source detection device is connected respectively with A/D converter with the light source on light source module;
The light signal that photoelectric conversion module is exported for receiving fiber coupler, and be translated into electrical signal transfer to synchronizing indicator;
Synchronizing indicator determines it is to detect the No. of believing one side only zero or zero inclined to one side orthogonal signal according to outside input, in the time detecting the No. of believing one side only zero, the electric signal that synchronizing indicator transmits photoelectricity receiver module amplifies, obtain the No. of believing one side only zero and be transferred to low-pass filter, in the time detecting zero inclined to one side orthogonal signal, the electric signal that synchronizing indicator transmits photoelectricity receiver module amplifies and 90 ° of phase shifts, obtains zero inclined to one side orthogonal signal and is transferred to low-pass filter;
Low-pass filter carries out filtering to the signal receiving, and filtered signal is transferred to A/D converter;
PZT controller determines it is alternating voltage or the alternating current that gathers PZT according to outside input, and gathered AC signal is transferred to peak-detector circuit;
Peak-detector circuit carries out peak detection for AC signal that PZT is transmitted, by the peak transmission of obtaining to A/D converter;
Described peak-detector circuit comprises switching diode BAV70, capacitor C 5, capacitor C 6, resistance R 60, resistance R 61 and resistance R 62; Wherein, one end of capacitor C 5 is connected with PZT controller, and the other end of capacitor C 5 is connected with direct supply by resistance R 60, is connected with A/D converter by resistance R 61, and be connected with an input end of switching diode BAV70, the output terminal of the diode BAV70 that opens the light is by resistance R 62 ground connection; This peak-detector circuit further passes through capacitor C 6 ground connection at resistance R 61 and the link of A/D converter, and another input end of switching diode BAV70 is further connected with reference power source U;
Light source detection device is for gathering the electric current of light source on light source module, and by gathered current signal transfer to A/D converter;
A/D converter is for carrying out analog to digital conversion by the signal of reception, and by the digital data transmission being converted to display;
Display shows the digital signal receiving.
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| CN201210240569.6A CN102759366B (en) | 2012-07-11 | 2012-07-11 | Detection device of optical fiber gyroscope optical module |
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|---|---|---|---|
| CN201210240569.6A CN102759366B (en) | 2012-07-11 | 2012-07-11 | Detection device of optical fiber gyroscope optical module |
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| CN102759366B true CN102759366B (en) | 2014-11-26 |
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| CN103472012B (en) * | 2013-09-16 | 2017-01-11 | 南京农业大学 | Signal conditioning circuit used for monitoring crop growth information |
| CN106341099A (en) * | 2016-08-10 | 2017-01-18 | 陕西华燕航空仪表有限公司 | Pre-amplification signal filtering circuit and filtering method for closed-loop optical fiber gyroscope |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109637A (en) * | 2007-08-21 | 2008-01-23 | 浙江大学 | Method for improving zero bias temperature sensitivity of optical fiber gyroscope |
| CN101256078A (en) * | 2008-03-25 | 2008-09-03 | 浙江大学 | Method for eliminating acceleration effect of optic fiber gyroscope graduation factor |
| EP2453206A1 (en) * | 2010-11-10 | 2012-05-16 | Honeywell International, Inc. | Fiber optic gyroscope with constant optical power using a light source current servo combined with digital demodulation intensity suppression for radiation and vibration insensitivity |
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| US6763153B2 (en) * | 2002-04-17 | 2004-07-13 | Kvh Industries, Inc. | Apparatus and method for electronic RIN reduction in fiber-optic sensors utilizing filter with group delay |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101109637A (en) * | 2007-08-21 | 2008-01-23 | 浙江大学 | Method for improving zero bias temperature sensitivity of optical fiber gyroscope |
| CN101256078A (en) * | 2008-03-25 | 2008-09-03 | 浙江大学 | Method for eliminating acceleration effect of optic fiber gyroscope graduation factor |
| EP2453206A1 (en) * | 2010-11-10 | 2012-05-16 | Honeywell International, Inc. | Fiber optic gyroscope with constant optical power using a light source current servo combined with digital demodulation intensity suppression for radiation and vibration insensitivity |
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