CN102636187A - Highly reciprocal resonant mode fiber-optic gyroscope detection device and method - Google Patents
Highly reciprocal resonant mode fiber-optic gyroscope detection device and method Download PDFInfo
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Abstract
The invention discloses a highly reciprocal resonant mode fiber-optic gyroscope detection device and method. According to the invention, firstly light output by a laser is subjected to high frequency phase modulation, then the light is divided into two lights with the same energy by virtue of an optical splitter, and then the two lights are respectively subjected to low frequency phase modulation, and finally the two lights enter into an optical annular resonant cavity. A photoelectric converter converts the two lights output from the resonant cavity into electric signals, an anticlockwise signal is demodulated and then is fed back as an error, the two electric signals are subtracted and then are demodulated, and a result is obtained, and the result is an output signal of a gyroscope. The highly reciprocal resonant mode fiber-optic gyroscope detection device and method disclosed by the invention can cause a resonant fiber-optic gyroscope to have high reciprocity, and an extraction manner of a gyroscope signal is beneficial to eliminating reciprocal noise.
Description
Technical field
The present invention relates to the signal detection technique field, relate in particular to a kind of pick-up unit and method of resonance type optical gyroscope of modulation of height reciprocity.
Background technology
(Resonator Optic Gyro is to utilize optics Sagnac effect to realize rotating a kind of high-precision inertial sensor that detects ROG) to resonance type optical gyroscope.Compare micromechanical gyro (Micro Electro Mechanical Systems, MEMS), ROG friction parts have stronger anti-vibration and impact resistance, and insensitive to acceleration of gravity; (Interferometric Fiber Optic Gyro, IFOG), ROG strengthens the Sagnac effect through ring resonator, on miniaturization and low cost, has very big advantage to compare interference type optical fiber gyroscope.
The Sagnac effect is a kind of very faint effect, and exists various optical noises in the actual resonance type optical gyroscope, and particularly the backscattering noise is seriously restricting the raising of Gyro Precision.Usually, for reducing the backscattering noise effect, need be to (Clockwise, CW) with counterclockwise (Counterclockwise, CCW) the direction light wave adopts different frequency modulation (PFM) and demodulation techniques clockwise among the ROG.Yet CW adopts different frequency modulation (PFM) and demodulation techniques with the CCW light beam, has increased the nonreciprocity of system inevitably, makes the nonreciprocity noise increase greatly the influence of ROG.
Summary of the invention
The objective of the invention is deficiency, a kind of pick-up unit and method of resonance type optical gyroscope of height reciprocity is provided to prior art.
The objective of the invention is to realize through following technical scheme:
A kind of pick-up unit of resonance type optical gyroscope of height reciprocity comprises by tunable laser, first phase-modulator, optical splitters, second phase-modulator, third phase position modulator, optical resonator, photoelectric commutator, modulating and demodulating signal module, feedback locking module; Tunable laser, first phase-modulator, optical splitters link to each other in order; The modulating and demodulating signal module links to each other with first phase-modulator, and optical splitters links to each other with second phase-modulator, third phase position modulator respectively, and second phase-modulator links to each other with optical resonator; Third phase position modulator links to each other with optical resonator; The modulating and demodulating signal module links to each other with second phase-modulator, and the modulating and demodulating signal module links to each other with third phase position modulator, and optical resonator links to each other with photoelectric commutator, modulating and demodulating signal module in order; The modulating and demodulating signal module links to each other with the feedback locking module, and the feedback locking module links to each other with tunable laser.
The pick-up unit of the resonance type optical gyroscope of another kind of height reciprocity comprises by tunable laser, first phase-modulator, optical splitters, second phase-modulator, optical attenuator, optical resonator, photoelectric commutator, modulating and demodulating signal module, feedback locking module; Tunable laser, first phase-modulator, optical splitters link to each other in order; The modulating and demodulating signal module links to each other with first phase-modulator; Optical splitters links to each other with second phase-modulator, optical attenuator respectively, and second phase-modulator links to each other with optical resonator, and optical attenuator links to each other with optical resonator; The modulating and demodulating signal module links to each other with second phase-modulator; Optical resonator links to each other with photoelectric commutator, modulating and demodulating signal module in order, and the modulating and demodulating signal module links to each other with the feedback locking module, and the feedback locking module links to each other with tunable laser.
A kind of detection method of resonance type optical gyroscope of height reciprocity may further comprise the steps:
1) signal modulation: after the laser that tunable laser is sent is modulated through first phase-modulator; Divide two identical bundle laser of success ratio through optical splitters; Pass through second phase-modulator and third phase position modulator respectively, and the modulation module produces input modulation signal U
1(t) drive first phase-modulator and accomplish phase modulation (PM), the modulating and demodulating signal module produces carrier suppressed modulation signal U
2(t) and U
3(t) drive second phase-modulator and third phase position modulator respectively and accomplish phase modulation (PM);
2) demodulation of signal: the laser of accomplishing phase modulation (PM); The input optical resonator; Form counterclockwise and clockwise two resonance light beams; Get into photoelectric commutator respectively and convert electric signal to, poor to the electric signal on the electric signal on counterclockwise road and clockwise and counterclockwise road used and detects modulation signal U
1(t) carry out demodulation with reference signal frequently;
3) gyro signal output: transfer to the feedback locking module as error signal after the electric signal demodulation that light beam obtains counterclockwise; Error signal is carried out ratio to the feedback locking module and back FEEDBACK CONTROL tunable laser is handled in integral operation; Make the output light frequency of laser instrument be stabilized in the counterclockwise resonance frequency of resonance type optical gyroscope; Subtract each other the back demodulation and convert electric signal to clockwise two resonance light beams counterclockwise, obtain the optical gyroscope signal, export the datalogger record to.
The resonance type optical gyroscope detection method of another kind of height reciprocity may further comprise the steps:
1) signal modulation: after the laser that tunable laser is sent is modulated through first phase-modulator; Divide two identical bundle laser of success ratio through optical splitters; Modulate and optical attenuator through second phase-modulator respectively, and the modulating and demodulating signal module produces input modulation signal U
1(t) drive first phase-modulator and accomplish phase modulation (PM), the modulating and demodulating signal module produces carrier suppressed modulation signal U
2(t) drive second phase-modulator and accomplish phase modulation (PM);
2) demodulation of signal: the laser of accomplishing phase modulation (PM); The input optical resonator forms counterclockwise and clockwise two resonance light beams, gets into photoelectric commutator respectively and converts electric signal to; Poor to the electric signal on the electric signal on counterclockwise road and clockwise and counterclockwise road used and U
1(t) carry out demodulation with reference signal frequently;
3) gyro signal output: transfer to the feedback locking module as error signal after the electric signal demodulation that light beam obtains counterclockwise; Error signal is carried out ratio to the feedback locking module and back FEEDBACK CONTROL tunable laser is handled in integral operation; Make the output light frequency of laser instrument be stabilized in the counterclockwise resonance frequency of resonance type optical gyroscope; And the two-way Beam Transformation becomes electric signal to subtract each other the back demodulation, obtains the optical gyroscope signal, exports the datalogger record to.
The beneficial effect that the present invention has:
1) pick-up unit of resonance type optical gyroscope provided by the invention has the reciprocity of height, makes the clockwise light signal of resonance type optical gyroscope and the counterclockwise entrained noise of light signal have the height reciprocity;
2) detection method of resonance type optical gyroscope provided by the invention can well be eliminated the reciprocity noise, improves the signal to noise ratio (S/N ratio) of output signal;
3) modulator approach provided by the invention has suppressed the backscattering noise again well when guaranteeing the height reciprocity, has improved the degree of stability of system.
Description of drawings
Fig. 1 is the structural representation of pick-up unit of the resonance type optical gyroscope of first kind of the present invention height reciprocity;
Fig. 2 is the structural representation of pick-up unit of the resonance type optical gyroscope of second kind of the present invention height reciprocity;
Fig. 3 be the resonance type optical gyroscope of height reciprocity when rotating clockwise and counterclockwise resonance frequency and laser frequency concern synoptic diagram;
Fig. 4 is the practical implementation case synoptic diagram of pick-up unit of the resonance type optical gyroscope of height reciprocity;
Among the figure: tunable laser 1, isolator 2, first phase-modulator 3, optical splitters 4, second phase-modulator 5, third phase position modulator 6, first circulator 7, second circulator 8, optical resonator 9, first photodetector 10, second photodetector 11, electricity subtracter 12, modulating and demodulating signal module 13, feedback locking module 14, datalogger 15.
Embodiment
Specify the present invention below in conjunction with embodiment and accompanying drawing, but the present invention is not limited only to this.
As shown in Figure 1, a kind of pick-up unit of resonance type optical gyroscope of height reciprocity comprises by tunable laser, first phase-modulator, optical splitters, second phase-modulator, third phase position modulator, optical resonator, photoelectric commutator, modulating and demodulating signal module, feedback locking module; Tunable laser, first phase-modulator, optical splitters link to each other in order; The modulating and demodulating signal module links to each other with first phase-modulator, and optical splitters links to each other with second phase-modulator, third phase position modulator respectively, and second phase-modulator links to each other with optical resonator; Third phase position modulator links to each other with optical resonator; The modulating and demodulating signal module links to each other with second phase-modulator, and the modulating and demodulating signal module links to each other with third phase position modulator, and optical resonator links to each other with photoelectric commutator, modulating and demodulating signal module in order; The modulating and demodulating signal module links to each other with the feedback locking module, and the feedback locking module links to each other with tunable laser.The laser instrument rear end need add the isolator protection, phase-modulator, and optical resonator, photoelectric commutator links to each other through circulator.
As shown in Figure 2, the pick-up unit of the resonance type optical gyroscope of another kind of height reciprocity comprises by tunable laser, first phase-modulator, optical splitters, second phase-modulator, optical attenuator, optical resonator, photoelectric commutator, modulating and demodulating signal module, feedback locking module; Tunable laser, first phase-modulator, optical splitters link to each other in order; The modulating and demodulating signal module links to each other with first phase-modulator; Optical splitters links to each other with second phase-modulator, optical attenuator respectively, and second phase-modulator links to each other with optical resonator, and optical attenuator links to each other with optical resonator; The modulating and demodulating signal module links to each other with second phase-modulator; Optical resonator links to each other with photoelectric commutator, modulating and demodulating signal module in order, and the modulating and demodulating signal module links to each other with the feedback locking module, and the feedback locking module links to each other with tunable laser.The laser instrument rear end need add the isolator protection, phase-modulator, and optical resonator, photoelectric commutator links to each other through circulator.
As shown in Figure 1, a kind of detection method of resonance type optical gyroscope of height reciprocity may further comprise the steps:
1) signal modulation: after the laser that tunable laser is sent is modulated through first phase-modulator; Divide two identical bundle laser of success ratio through optical splitters; Pass through second phase-modulator and third phase position modulator respectively, and the modulation module produces input modulation signal U
1(t) drive first phase-modulator and accomplish phase modulation (PM), the modulating and demodulating signal module produces carrier suppressed modulation signal U
2(t) and U
3(t) drive second phase-modulator and third phase position modulator respectively and accomplish phase modulation (PM);
2) demodulation of signal: the laser of accomplishing phase modulation (PM); The input optical resonator; Form counterclockwise and clockwise two resonance light beams; Get into photoelectric commutator respectively and convert electric signal to, poor to the electric signal on the electric signal on counterclockwise road and clockwise and counterclockwise road used and detects modulation signal U
1(t) carry out demodulation with reference signal frequently;
3) gyro signal output: transfer to the feedback locking module as error signal after the electric signal demodulation that light beam obtains counterclockwise; Error signal is carried out ratio to the feedback locking module and back FEEDBACK CONTROL tunable laser is handled in integral operation; Make the output light frequency of laser instrument be stabilized in the counterclockwise resonance frequency of resonance type optical gyroscope; Subtract each other the back demodulation and convert electric signal to clockwise two resonance light beams counterclockwise, obtain the optical gyroscope signal, export the datalogger record to.
As shown in Figure 2, the resonance type optical gyroscope detection method of another kind of height reciprocity may further comprise the steps:
1) signal modulation: after the laser that tunable laser is sent is modulated through first phase-modulator; Divide two identical bundle laser of success ratio through optical splitters; Modulate and optical attenuator through second phase-modulator respectively, and the modulating and demodulating signal module produces input modulation signal U
1(t) drive first phase-modulator and accomplish phase modulation (PM), the modulating and demodulating signal module produces carrier suppressed modulation signal U
2(t) drive second phase-modulator and accomplish phase modulation (PM);
(1) demodulation of signal: the laser of accomplishing phase modulation (PM); The input optical resonator forms counterclockwise and clockwise two resonance light beams, gets into photoelectric commutator respectively and converts electric signal to; Poor to the electric signal on the electric signal on counterclockwise road and clockwise and counterclockwise road used and U
1(t) carry out demodulation with reference signal frequently;
(2) gyro signal output: transfer to the feedback locking module as error signal after the electric signal demodulation that light beam obtains counterclockwise; Error signal is carried out ratio to the feedback locking module and back FEEDBACK CONTROL tunable laser is handled in integral operation; Make the output light frequency of laser instrument be stabilized in the counterclockwise resonance frequency of resonance type optical gyroscope; And the two-way Beam Transformation becomes electric signal to subtract each other the back demodulation, obtains the optical gyroscope signal, exports the datalogger record to.
As shown in Figure 3; Clockwise and counterclockwise resonance frequency and laser frequency concerned synoptic diagram when we had provided the highly resonance type optical gyroscope rotation of reciprocity; The laser frequency all-the-time stable is in the resonance frequency of counterclockwise light beam, and resonance frequency difference clockwise and counterclockwise light beam is the turn signal of resonance type optical gyroscope.
As shown in Figure 4, the resonance type optical gyroscope of height reciprocity comprises tunable laser 1, isolator 2, first phase-modulator 3, optical splitters 4, second phase-modulator 5, third phase position modulator 6, first circulator 7, second circulator 8, optical resonator 9, first photodetector 10, second photodetector 11, electricity subtracter 12, modulating and demodulating signal module 13, feedback locking module 14, datalogger 15; Tunable laser 1 and isolator 2, first phase-modulator 3, optical splitters 4 link to each other in order; Modulating and demodulating signal module 13 links to each other with first phase-modulator 3, and optical splitters 4 links to each other with second phase-modulator 5, third phase position modulator 6 respectively, and second phase-modulator 5 links to each other with first circulator 7; Third phase position modulator links to each other with second circulator 8; Modulating and demodulating signal module 13 links to each other with second phase-modulator 5, and modulating and demodulating signal module 13 links to each other with third phase position modulator 6, and first circulator 7 links to each other with optical resonator 9; Second circulator 8 links to each other with optical resonator 9; First circulator 7 links to each other with first photodetector 10, and second circulator 8 links to each other with second photodetector 11, and first photodetector 10, second photodetector 11 link to each other with electricity subtracter 12 respectively; Second photodetector 11 links to each other with modulating and demodulating signal module 13; Electricity subtracter 12 links to each other with modulating and demodulating signal module 13, and modulating and demodulating signal mould 13 links to each other with feedback locking module 14, datalogger 15 respectively, and feedback locking module 14 links to each other with tunable laser 1.We use optical phase modulator as phase-modulator; Photodetector is as photoelectric commutator; Writing realization modulating and demodulating signal module based on the enterprising line code of the development platform of FPGA, the feedback locking module uses digital multimeter or PC as datalogger.
Claims (4)
1. the pick-up unit of resonance type optical gyroscope of height reciprocity; It is characterized in that it comprises by tunable laser, first phase-modulator, optical splitters, second phase-modulator, third phase position modulator, optical resonator, photoelectric commutator, modulating and demodulating signal module, feedback locking module; Tunable laser, first phase-modulator, optical splitters link to each other in order; The modulating and demodulating signal module links to each other with first phase-modulator, and optical splitters links to each other with second phase-modulator, third phase position modulator respectively, and second phase-modulator links to each other with optical resonator; Third phase position modulator links to each other with optical resonator; The modulating and demodulating signal module links to each other with second phase-modulator, and the modulating and demodulating signal module links to each other with third phase position modulator, and optical resonator links to each other with photoelectric commutator, modulating and demodulating signal module in order; The modulating and demodulating signal module links to each other with the feedback locking module, and the feedback locking module links to each other with tunable laser.
2. the pick-up unit of resonance type optical gyroscope of height reciprocity; It is characterized in that it comprises by tunable laser, first phase-modulator, optical splitters, second phase-modulator, optical attenuator, optical resonator, photoelectric commutator, modulating and demodulating signal module, feedback locking module; Tunable laser, first phase-modulator, optical splitters link to each other in order; The modulating and demodulating signal module links to each other with first phase-modulator; Optical splitters links to each other with second phase-modulator, optical attenuator respectively, and second phase-modulator links to each other with optical resonator, and optical attenuator links to each other with optical resonator; The modulating and demodulating signal module links to each other with second phase-modulator; Optical resonator links to each other with photoelectric commutator, modulating and demodulating signal module in order, and the modulating and demodulating signal module links to each other with the feedback locking module, and the feedback locking module links to each other with tunable laser.
3. an application rights requires the detection method of the resonance type optical gyroscope of 1 said height of devices reciprocity, it is characterized in that, may further comprise the steps:
1) signal modulation: after the laser that tunable laser is sent is modulated through first phase-modulator; Divide two identical bundle laser of success ratio through optical splitters; Pass through second phase-modulator and third phase position modulator respectively, and the modulation module produces input modulation signal U
1(t) drive first phase-modulator and accomplish phase modulation (PM), the modulating and demodulating signal module produces carrier suppressed modulation signal U
2(t) and U
3(t) drive second phase-modulator and third phase position modulator respectively and accomplish phase modulation (PM);
2) demodulation of signal: the laser of accomplishing phase modulation (PM); The input optical resonator; Form counterclockwise and clockwise two resonance light beams; Get into photoelectric commutator respectively and convert electric signal to, poor to the electric signal on the electric signal on counterclockwise road and clockwise and counterclockwise road used and detects modulation signal U
1(t) carry out demodulation with reference signal frequently;
3) gyro signal output: transfer to the feedback locking module as error signal after the electric signal demodulation that light beam obtains counterclockwise; Error signal is carried out ratio to the feedback locking module and back FEEDBACK CONTROL tunable laser is handled in integral operation; Make the output light frequency of laser instrument be stabilized in the counterclockwise resonance frequency of resonance type optical gyroscope; Subtract each other the back demodulation and convert electric signal to clockwise two resonance light beams counterclockwise, obtain the optical gyroscope signal, export the datalogger record to.
4. an application rights requires the resonance type optical gyroscope detection method of 2 said height of devices reciprocity, it is characterized in that, may further comprise the steps:
1) signal modulation: after the laser that tunable laser is sent is modulated through first phase-modulator; Divide two identical bundle laser of success ratio through optical splitters; Modulate and optical attenuator through second phase-modulator respectively, and the modulating and demodulating signal module produces input modulation signal U
1(t) drive first phase-modulator and accomplish phase modulation (PM), the modulating and demodulating signal module produces carrier suppressed modulation signal U
2(t) drive second phase-modulator and accomplish phase modulation (PM);
2) demodulation of signal: the laser of accomplishing phase modulation (PM); The input optical resonator forms counterclockwise and clockwise two resonance light beams, gets into photoelectric commutator respectively and converts electric signal to; Poor to the electric signal on the electric signal on counterclockwise road and clockwise and counterclockwise road used and U
1(t) carry out demodulation with reference signal frequently;
3) gyro signal output: transfer to the feedback locking module as error signal after the electric signal demodulation that light beam obtains counterclockwise; Error signal is carried out ratio to the feedback locking module and back FEEDBACK CONTROL tunable laser is handled in integral operation; Make the output light frequency of laser instrument be stabilized in the counterclockwise resonance frequency of resonance type optical gyroscope; And the two-way Beam Transformation becomes electric signal to subtract each other the back demodulation, obtains the optical gyroscope signal, exports the datalogger record to.
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| CN104180970A (en) * | 2014-07-10 | 2014-12-03 | 浙江大学 | Polarization characteristic testing method and device for basic-unit structure parameters of polarization-maintaining optical-waveguide annular resonant cavity |
| CN104729493A (en) * | 2013-12-18 | 2015-06-24 | 广西大学 | Novel detection method of optical fiber gyroscope |
| US9121708B1 (en) | 2014-05-08 | 2015-09-01 | Honeywell International Inc. | Resonator fiber optic gyroscope without frequency overlap in sideband-heterodyne-detection modulations |
| CN105783904A (en) * | 2016-03-08 | 2016-07-20 | 北京航空航天大学 | Resonant type fiber-optic gyroscope frequency locking device |
| CN108168537A (en) * | 2018-02-06 | 2018-06-15 | 浙江大学 | The detecting system and method for resonance type optical gyroscope based on quadrature demodulation |
| CN110360998A (en) * | 2019-06-28 | 2019-10-22 | 浙江大学 | A kind of detection system and method for the resonance type optical gyroscope based on pulse optical detection |
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| US9121708B1 (en) | 2014-05-08 | 2015-09-01 | Honeywell International Inc. | Resonator fiber optic gyroscope without frequency overlap in sideband-heterodyne-detection modulations |
| CN104180970B (en) * | 2014-07-10 | 2016-08-24 | 浙江大学 | Protect polarisation wave guide ring shaped resonant cavity basic cell structure parameter polarization characteristic method of testing and device |
| CN104180970A (en) * | 2014-07-10 | 2014-12-03 | 浙江大学 | Polarization characteristic testing method and device for basic-unit structure parameters of polarization-maintaining optical-waveguide annular resonant cavity |
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| CN113405543A (en) * | 2020-03-17 | 2021-09-17 | 深圳大学 | Resonant fiber-optic gyroscope and angular velocity measuring method |
| CN113405543B (en) * | 2020-03-17 | 2024-02-09 | 深圳大学 | Resonant fiber-optic gyroscope and angular velocity measurement method |
| CN114459457A (en) * | 2022-02-10 | 2022-05-10 | 浙江大学 | Resonant fiber-optic gyroscope system and method based on reciprocal modulation secondary demodulation |
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