CN103968821A - Two-way resonant optical gyroscope - Google Patents

Two-way resonant optical gyroscope Download PDF

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Publication number
CN103968821A
CN103968821A CN201410210762.4A CN201410210762A CN103968821A CN 103968821 A CN103968821 A CN 103968821A CN 201410210762 A CN201410210762 A CN 201410210762A CN 103968821 A CN103968821 A CN 103968821A
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coupling mechanism
port
output terminal
input end
optical fiber
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CN103968821B (en
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闫树斌
安盼龙
郑永秋
李小枫
薛晨阳
刘耀英
张成飞
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North University of China
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North University of China
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
    • G01C19/58—Turn-sensitive devices without moving masses
    • G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
    • G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Gyroscopes (AREA)

Abstract

The invention relates to a high-precision resonant optical gyroscope, and in particular relates to a two-way resonant optical gyroscope which comprises a first circulator CIR1, a second coupler C2, a data acquisition module, a third coupler C3 and a second photoelectric detector PD2, wherein a third opening of the first circulator CIR1 is connected with a first input end of the third coupler C3 by an optical fiber; a second output end of the second coupler C2 is connected with a second input end of the third coupler C3; an output end of the third coupler C3 is connected with an input end of the second photoelectric detector PD2; an output end of the second photoelectric detector PD2 is connected with an acquisition port of the data acquisition module. According to the optical synthesis principle that two simple harmonic waves which have small frequency difference and same velocity and spread along the same direction can form beat phenomenon after being overlapped, the two-way resonant optical gyroscope is provided; the two-way resonant optical gyroscope is convenient in frequency difference measurement, few in photoelectric devices of the gyroscope, accurate in the measured frequency difference and free from a detection locking threshold value area.

Description

Two-way resonance type optical gyroscope
Technical field
The present invention relates to high-precision resonance type optical gyroscope, be specially two-way resonance type optical gyroscope.
Background technology
Resonance type optical gyroscope is the Novel angle speed pickup of a kind of small size, low-power consumption, high precision and the high reliability that grow up after microelectromechanicgyroscope gyroscope, laser gyro, interference type optical fiber gyroscope.Under the drive of the great plans such as national survey of deep space, weapon precise guidance, Big Dipper navigation and engineering, the characteristics such as high sensitivity, microminaturization, high stability, anti high overload become the development trend of resonance type optical gyroscope, and the accurate detection of signal is the most important thing that realizes these indexs.
Resonance type optical gyroscope is the angular velocity of rotation that application Sagnac effect principle is measured tested carrier, being specially the beam frequencies that the inner tunable narrow linewidth light source of optical gyroscope (send beam frequencies and be less than 1KHz) is sent is locked in by the feedback control circuit on feedback branch in the centre frequency of intrinsic transmission peaks of fiber annular resonant cavity, rotating by optical gyroscope strapdown carrier the photodetection amplitude causing changes, and convert and obtain in fiber annular resonant cavity along the frequency difference between contrary two-way light beam according to this amplitude variation, changed by the frequency difference obtaining, thereby record the rotational angular velocity of tested motion carrier.Because traditional resonance type optical gyroscope is that the frequency difference producing by rotation detects angular velocity, frequency difference need to change conversion by photodetection amplitude and obtain, and photodetection amplitude will obtain by light beam is carried out to modulation and demodulation, therefore traditional resonance type optical gyroscope inside needs modulator, detuner and some fill-in light electrical parts, these devices are from being vibrated in rotation process, the impact of white noise, cause the accuracy of detection of gyro lower, the existence of these devices simultaneously causes gyro detection to have lock-in threshold district, being gyro can't detect extremely slow or turn signal at a high speed, its sensing range is very limited.
Summary of the invention
The present invention, in order to solve the low and limited problem of sensing range of the accuracy of detection of existing resonance type optical gyroscope, provides two-way resonance type optical gyroscope.
The present invention adopts following technical scheme to realize: two-way resonance type optical gyroscope, comprise isolation collimation chip tunable optical source FL, the output terminal of isolation collimation chip tunable optical source FL is connected with the input end of optical isolator ISO by optical fiber, the output terminal of optical isolator ISO is connected with the input end of the first coupling mechanism C1 by optical fiber, the first output terminal of the first coupling mechanism C1 is connected with the input end of phase-modulator PM by optical fiber, the output terminal of phase-modulator PM is connected with the first port of the first circulator CIR1 by optical fiber, the second port of the first circulator CIR1 is connected with the first port of the 4th coupling mechanism C4 by optical fiber,
The second output terminal of the first coupling mechanism C1 is connected with the first port of the second circulator CIR2 by optical fiber, the second port of the second circulator CIR2 is connected with the second port of the 4th coupling mechanism C4 by optical fiber, and the 3rd port of the 4th coupling mechanism C4 is all connected with the input port of fiber annular resonant cavity FRR by optical fiber with the 4th port;
The 3rd port of the second circulator CIR2 is connected with the input end of the second coupling mechanism C2 by optical fiber, the first output terminal of the second coupling mechanism C2 is connected with the input end of the first photoelectric detector PD 1 by optical fiber, the output terminal of the first photoelectric detector PD 1 is connected with the input end of lock-in amplifier LIA by optical fiber, the output terminal of lock-in amplifier LIA is connected with the input end of feedback control circuit FBC by signal wire, and the output terminal of feedback control circuit FBC is connected with the feedback end of isolation collimation chip tunable optical source FL;
Also comprise digital sampling and processing, the 3rd coupling mechanism C3 and the second photoelectric detector PD 2, the 3rd port of the first circulator CIR1 is connected with the first input end of the 3rd coupling mechanism C3 by optical fiber, the second output terminal of the second coupling mechanism C2 is connected with the second input end of the 3rd coupling mechanism C3, the output terminal of the 3rd coupling mechanism C3 is connected with the input end of the second photoelectric detector PD 2, and the collection port of the output terminal of the second photodetector and digital sampling and processing is connected.
When work, the light beam being sent by isolation collimation chip tunable optical source FL is after optical isolator ISO and the first beam splitter C1, being divided into two-way power equates, frequency difference is zero two-beam, wherein light beam is after phase-modulator PM and the first circulator CIR1, enter fiber annular resonant cavity FRR by the 4th coupling mechanism C4, in fiber annular resonant cavity FRR, form counterclockwise light beam, wherein another light beam is after the second circulator CIR2, enter fiber annular resonant cavity FRR by the 4th coupling mechanism C4, in fiber annular resonant cavity FRR, form clockwise light beam, the counterclockwise light beam circle that detours in fiber annular resonant cavity FRR, finally by the 4th coupling mechanism C4, the second circulator CIR2 and the second coupling mechanism C2 enter the first photoelectric detector PD 1, then through lock-in amplifier LIA, feedback control circuit FBC enters the feedback end of tunable optical source FL, to isolation collimation chip tunable optical source, FL carries out frequency modulation, make the beam frequencies of isolation collimation chip tunable optical source FL output be locked in the transmission spectrum peak center frequency place of fiber annular resonant cavity FRR, clockwise light beam and counterclockwise light beam in fiber annular resonant cavity FRR, detour after a circle and superpose at the 3rd coupling mechanism C3 place, the light beam after stack enters the second photoelectric detector PD 2 and carries out opto-electronic conversion, the electric signal after conversion stores data acquisition module into, after light beam and counterclockwise light beam superpose by the 3rd coupling mechanism C3 clockwise, phenomenon occurs to clap, form beat signal, this beat signal stores in digital sampling and processing, recorded the wavelength of beat signal by digital sampling and processing, digital sampling and processing is again according to formula can calculate the difference on the frequency between two-way light beam, just can obtain the angular velocity of rotation of measured object according to difference on the frequency, this optical gyroscope inside does not need modulator, detuner and some additional devices, in rotation process, can not be subject to the impact of vibration, signal white noise and reduce the accuracy of detection of gyro, not exist yet and detect lock-in threshold district.
The poor program of calculated rate in digital sampling and processing is that those skilled in the art is known.
The simple harmonic wave stack of the two row co-propagate that the present invention is less according to frequency difference, speed is identical can form the optics composition principle of clapping phenomenon, easy two-way resonance type optical gyroscope is provided, the photoelectric device comprising in the poor convenience of this two-way resonance type optical gyroscope frequency measurement, gyro is less, the frequency difference recording is accurate, do not exist and detect lock-in threshold district, solved the not high and limited problem of sensing range of existing resonance type optical gyroscope sensitivity.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the oscillogram of the beat signal that detects of oscillograph.
Fig. 3 is the frequency difference schematic diagram calculating.
Embodiment
Two-way resonance type optical gyroscope, comprise isolation collimation chip tunable optical source FL, the output terminal of isolation collimation chip tunable optical source FL is connected with the input end of optical isolator ISO by optical fiber, the output terminal of optical isolator ISO is connected with the input end of the first coupling mechanism C1 by optical fiber, the first output terminal of the first coupling mechanism C1 is connected with the input end of phase-modulator PM by optical fiber, the output terminal of phase-modulator PM is connected with the first port of the first circulator CIR1 by optical fiber, the second port of the first circulator CIR1 is connected with the first port of the 4th coupling mechanism C4 by optical fiber,
The second output terminal of the first coupling mechanism C1 is connected with the first port of the second circulator CIR2 by optical fiber, the second port of the second circulator CIR2 is connected with the second port of the 4th coupling mechanism C4 by optical fiber, and the 3rd port of the 4th coupling mechanism C4 is all connected with the input port of fiber annular resonant cavity FRR by optical fiber with the 4th port;
The 3rd port of the second circulator CIR2 is connected with the input end of the second coupling mechanism C2 by optical fiber, the first output terminal of the second coupling mechanism C2 is connected with the input end of the first photoelectric detector PD 1 by optical fiber, the output terminal of the first photoelectric detector PD 1 is connected with the input end of lock-in amplifier LIA by optical fiber, the output terminal of lock-in amplifier LIA is connected with the input end of feedback control circuit FBC by signal wire, and the output terminal of feedback control circuit FBC is connected with the feedback end of isolation collimation chip tunable optical source FL;
Also comprise digital sampling and processing, the 3rd coupling mechanism C3 and the second photoelectric detector PD 2, the 3rd port of the first circulator CIR1 is connected with the first input end of the 3rd coupling mechanism C3 by optical fiber, the second output terminal of the second coupling mechanism C2 is connected with the second input end of the 3rd coupling mechanism C3, the output terminal of the 3rd coupling mechanism C3 is connected with the input end of the second photodetector, and the collection port of the output terminal of the second photodetector and digital sampling and processing is connected.

Claims (1)

1. two-way resonance type optical gyroscope, comprise isolation collimation chip tunable optical source FL, the output terminal of isolation collimation chip tunable optical source FL is connected with the input end of optical isolator ISO by optical fiber, the output terminal of optical isolator ISO is connected with the input end of the first coupling mechanism C1 by optical fiber, the first output terminal of the first coupling mechanism C1 is connected with the input end of phase-modulator PM by optical fiber, the output terminal of phase-modulator PM is connected with the first port of the first circulator CIR1 by optical fiber, the second port of the first circulator CIR1 is connected with the first port of the 4th coupling mechanism C4 by optical fiber,
The second output terminal of the first coupling mechanism C1 is connected with the first port of the second circulator CIR2 by optical fiber, the second port of the second circulator CIR2 is connected with the second port of the 4th coupling mechanism C4 by optical fiber, and the 3rd port of the 4th coupling mechanism C4 is all connected with the input port of fiber annular resonant cavity FRR by optical fiber with the 4th port;
The 3rd port of the second circulator CIR2 is connected with the input end of the second coupling mechanism C2 by optical fiber, the first output terminal of the second coupling mechanism C2 is connected with the input end of the first photoelectric detector PD 1 by optical fiber, the output terminal of the first photoelectric detector PD 1 is connected with the input end of lock-in amplifier LIA by optical fiber, the output terminal of lock-in amplifier LIA is connected with the input end of feedback control circuit FBC by signal wire, and the output terminal of feedback control circuit FBC is connected with the feedback end of isolation collimation chip tunable optical source FL;
Characterized by further comprising digital sampling and processing, the 3rd coupling mechanism C3 and the second photoelectric detector PD 2, the 3rd port of the first circulator CIR1 is connected with the first input end of the 3rd coupling mechanism C3 by optical fiber, the second output terminal of the second coupling mechanism C2 is connected with the second input end of the 3rd coupling mechanism C3, the output terminal of the 3rd coupling mechanism C3 is connected with the input end of the second photodetector, and the collection port of the output terminal of the second photodetector and digital sampling and processing is connected.
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Cited By (5)

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Publication number Priority date Publication date Assignee Title
CN108801237A (en) * 2018-06-08 2018-11-13 浙江大学 The suppressing method and device of two-way close loop resonance formula optical gyroscope Kerr effect noises based on second harmonic subtraction
CN113310480A (en) * 2021-05-19 2021-08-27 北京航空航天大学 Optical gyroscope system based on silicon nitride waveguide resonant cavity
CN113465630A (en) * 2021-07-02 2021-10-01 浙江大学 Optical resonant cavity free spectral line width online test system and method based on coherent demodulation
CN117128945A (en) * 2023-10-20 2023-11-28 中北大学 Super-sensitive angular velocity sensor based on singular surface and measuring method
CN117570954A (en) * 2024-01-15 2024-02-20 中北大学 Resonant optical gyroscope based on wide-spectrum light source and angular velocity measurement method

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108801237A (en) * 2018-06-08 2018-11-13 浙江大学 The suppressing method and device of two-way close loop resonance formula optical gyroscope Kerr effect noises based on second harmonic subtraction
CN108801237B (en) * 2018-06-08 2020-07-07 浙江大学 Method and device for inhibiting Kerr effect noise of double-path closed-loop resonant optical gyroscope based on second harmonic subtraction
CN113310480A (en) * 2021-05-19 2021-08-27 北京航空航天大学 Optical gyroscope system based on silicon nitride waveguide resonant cavity
CN113465630A (en) * 2021-07-02 2021-10-01 浙江大学 Optical resonant cavity free spectral line width online test system and method based on coherent demodulation
CN113465630B (en) * 2021-07-02 2023-09-22 浙江大学 Optical resonant cavity free spectral line width online test system and method based on coherent demodulation
CN117128945A (en) * 2023-10-20 2023-11-28 中北大学 Super-sensitive angular velocity sensor based on singular surface and measuring method
CN117128945B (en) * 2023-10-20 2023-12-26 中北大学 Super-sensitive angular velocity sensor based on singular surface and measuring method
CN117570954A (en) * 2024-01-15 2024-02-20 中北大学 Resonant optical gyroscope based on wide-spectrum light source and angular velocity measurement method

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