CN205175412U - Resonant mode fiber optic gyroscope resonant frequency tracker - Google Patents
Resonant mode fiber optic gyroscope resonant frequency tracker Download PDFInfo
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- CN205175412U CN205175412U CN201520962297.XU CN201520962297U CN205175412U CN 205175412 U CN205175412 U CN 205175412U CN 201520962297 U CN201520962297 U CN 201520962297U CN 205175412 U CN205175412 U CN 205175412U
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Abstract
The utility model belongs to resonant mode fiber optic gyroscope technique relates to a resonant mode fiber optic gyroscope resonant frequency tracker. Resonant mode fiber optic gyroscope resonant frequency tracker includes resonance tracking coarse adjusting system and resonance tracking fine setting system, the coarse adjusting system is trailed to resonance and resonance tracking fine setting system is continuous with the laser -driven of laser instrument respectively, and resonance tracking coarse adjusting system has the approximate reference resonant cavity of the sensitive ring of optic fibre in a length and relation of connection and the resonance tracking fine setting system. The utility model discloses a coarse adjusting of referring to the resonant cavity and carrying out optic fibre ring resonant frequency is introduced to the method of two tunnel frequency stabilizations of thickness in the system for the laser instrument falls into the scope of finely tuning the frequency stabilization circuit with the frequency of optic fibre ring, is guaranteeing to guarantee the frequency locking precision like this when the laser instrument does not take off the lock.
Description
Technical field
The utility model belongs to resonance type optical fiber gyro technology, relates to a kind of resonance type optical fiber gyro Resonant Frequency Tracking System.
Background technology
Resonance type optical fiber gyro is integrated with the advantage of laser gyro and interference type optical fiber gyroscope, and very short optical fiber and low cost can be utilized to realize navigation level and higher level performance.The realization of its measurement function by by narrow linewidth laser frequency time locking to the resonance frequency of sensitive optical fibre ring, and the resonance frequency of sensitive optical fibre ring is determined by carrier speed.Resonance frequency tracking technique is one of core technology of resonance type optical fiber gyro, and its tracking accuracy is directly connected to the precision of resonance type optical fiber gyro.
As shown in Figure 1, traditional frequency tracking method utilizes phase-modulator to carry out frequency modulation (PFM) (being realized by phase-modulation) to the light beam of output optical fibre ring, this makes resonant ring export vibration light intensity, this vibration light beam imports fiber-optical probe by optical fiber, detector output signal enters the difference that pre processing circuit and phase-sensitive demodulating circuits obtain laser frequency and fiber loop resonance frequency, and this difference frequency signal is passed to laser instrument by laser drive circuit and carries out frequency-tracking.
One of the overriding noise of resonance type optical fiber gyro during backscattering noise, the impact of backscattering noise mainly comprises the impact of the back of the body impact of evanescent light wve itself and the relevant light intensity between backward scattering light wave and signal light-wave, needs to adopt the method suppressing incident resonator cavity light wave carrier component.But carrier wave suppressing method needs by phase modulator modulation cutting surface on specific working point, the requirement of this requirement associating gyrosystem signal to noise ratio (S/N ratio), modulation/demodulation circuit only has hundreds of KHz to error signal.But external temperature change causes resonant ring resonance frequency to be drifted about greatly, reaches the tens megahertz orders of magnitude, temperature jitter produces the drift of fiber optic loop resonance frequency and very likely exceeds this scope, causes syntonic follow circuit malfunction.Traditional solution controls gyro operating environment, reduction temperature jitter, but can cause the lifting of the huge of gyro volume and cost like this.
Utility model content
The purpose of this utility model is: provide a kind of dynamic range that effectively can improve resonance type optical fiber gyro resonance tracking system, promotes the Resonant Frequency Tracking System of optical fibre gyro environmental suitability.
The technical solution of the utility model is: a kind of resonance type optical fiber gyro Resonant Frequency Tracking System, it comprises syntonic follow coarse tuning system and syntonic follow micro-tensioning system, described syntonic follow coarse tuning system and syntonic follow micro-tensioning system are connected with the Laser Driven of laser instrument respectively, and syntonic follow coarse tuning system has the approximate reference cavity of a length and annexation and syntonic follow micro-tensioning system inner fiber sensing ring.
Described syntonic follow coarse tuning system is made up of reference cavity and resonance tracking circuit, its syntonic follow circuit structure is identical with the syntonic follow circuit structure of micro-tensioning system, also the PM module, oscillator, phase-sensitive demodulator, pre processing circuit and the photodiode that connect in turn is comprised, described reference cavity is the fiber optic loop that a length is substantially identical with optical fiber sensing ring, and its two ends are connected with PM module and photodiode respectively.
The utility model has the advantages that: the utility model adopts the method for thickness two-way frequency stabilization, introduce the coarse adjustment that fiber optic loop resonance frequency is carried out in reference cavity in systems in which, make the frequency of laser instrument and fiber optic loop fall into the scope of finely tuning frequency stabilization circuit, while guarantee laser instrument not lock-off, ensure Frequency Locking precision like this.
Accompanying drawing explanation
Fig. 1 is traditional fiber resonant ring frequency-tracking system schematic;
Fig. 2 is the utility model resonance type optical fiber gyro Resonant Frequency Tracking System schematic diagram,
Wherein, 1-laser instrument, 2-Laser Driven system, 3-phase-modulator, 4-oscillator, 5-phase demodulation system, amplifying circuit before 6-, 7-photodiode, 8-sensitive optical fibre ring, 9-reference cavity.
Embodiment
Be described further below in conjunction with accompanying drawing with to the utility model:
Refer to Fig. 2, the fiber optic loop Resonant Frequency Tracking System of the utility model resonance type optical fiber gyro comprises syntonic follow coarse tuning system and syntonic follow micro-tensioning system.Described syntonic follow micro-tensioning system is made up of optical fiber sensing ring and resonance tracking circuit.Wherein, syntonic follow circuit comprises the PM module, oscillator, phase-sensitive demodulator, pre processing circuit and the photodiode that connect in turn.PM module and photodiode are connected with optical fiber sensing ring respectively, and meanwhile, PM model calling Laser output, for carrying out phase-modulation to laser, phase-sensitive demodulator connects Laser Driven module, controls laser for providing difference frequency signal.
Described syntonic follow coarse tuning system is made up of reference cavity and resonance tracking circuit.Its syntonic follow circuit structure is identical with the syntonic follow circuit structure of micro-tensioning system, also comprises the PM module, oscillator, phase-sensitive demodulator, pre processing circuit and the photodiode that connect in turn.Described reference cavity is the fiber optic loop that a length is substantially identical with optical fiber sensing ring, and its two ends are connected with photodiode with PM module respectively.
During the work of the utility model resonance type optical fiber gyro Resonant Frequency Tracking System, first follow the tracks of coarse tuning system PM module by resonator cavity and high frequency modulated is carried out to Laser output, then reference cavity carries out frequency discrimination to modulation laser beam, difference frequency signal is provided after frequency discrimination signal being processed by photodiode, pre processing circuit and phase-sensitive demodulator, control Laser Driven module, coarse adjustment is carried out to laser frequency.
Then by the PM module of resonator cavity tracking micro-tensioning system, high frequency modulated is carried out to the Laser output after coarse adjustment, then optical fiber sensing ring carries out frequency discrimination to modulation laser beam, difference frequency signal is provided after frequency discrimination signal being processed by photodiode, pre processing circuit and phase-sensitive demodulator, control Laser Driven module, laser frequency is finely tuned, realizes the resonance frequency high precision tracking to optical fibre gyro.
Owing to there is no the restriction of carrier wave rejection condition, syntonic follow coarse tuning system phase modulator modulation frequency used can much larger than micro-tensioning system, be equivalent to frequency modulation (PFM) laser instrument being carried out to wide range, expand the dynamic range (about tens megahertzes) of syntonic follow coarse tuning system, also can laser frequency and optical fiber sensing ring frequency difference are locked in syntonic follow micro-tensioning system dynamic range when temperature variation is severe; Syntonic follow micro-tensioning system, based on coarse tuning system, with optical fiber sensing ring for frequency-tracking target, on carrier wave inhibitory character point, compensates the frequency detuning of hundreds of KHz, ensures fiber optic loop resonance frequency tracking accuracy when not lock-off.
Compared to existing resonance type optical fiber gyro Resonant Frequency Tracking System, the utility model dynamic range is large, can ensure resonant ring syntonic follow precision under severe temperature environment.
Claims (2)
1. a resonance type optical fiber gyro Resonant Frequency Tracking System, it is characterized in that, comprise syntonic follow coarse tuning system and syntonic follow micro-tensioning system, described syntonic follow coarse tuning system and syntonic follow micro-tensioning system are connected with the Laser Driven of laser instrument respectively, and syntonic follow coarse tuning system has the approximate reference cavity of a length and annexation and syntonic follow micro-tensioning system inner fiber sensing ring.
2. resonance type optical fiber gyro Resonant Frequency Tracking System according to claim 1, it is characterized in that, described syntonic follow coarse tuning system is made up of reference cavity and resonance tracking circuit, its syntonic follow circuit structure is identical with the syntonic follow circuit structure of micro-tensioning system, also the PM module, oscillator, phase-sensitive demodulator, pre processing circuit and the photodiode that connect in turn is comprised, described reference cavity is the fiber optic loop that a length is substantially identical with optical fiber sensing ring, and its two ends are connected with PM module and photodiode respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520962297.XU CN205175412U (en) | 2015-11-26 | 2015-11-26 | Resonant mode fiber optic gyroscope resonant frequency tracker |
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| CN201520962297.XU CN205175412U (en) | 2015-11-26 | 2015-11-26 | Resonant mode fiber optic gyroscope resonant frequency tracker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108318020B (en) * | 2017-12-15 | 2021-12-03 | 中国航空工业集团公司西安飞行自动控制研究所 | Resonant mode fiber optic gyroscope resonant frequency tracking system based on pseudorandom signal |
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2015
- 2015-11-26 CN CN201520962297.XU patent/CN205175412U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318020B (en) * | 2017-12-15 | 2021-12-03 | 中国航空工业集团公司西安飞行自动控制研究所 | Resonant mode fiber optic gyroscope resonant frequency tracking system based on pseudorandom signal |
| 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 |
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