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Optical fiber gyroscope self-checking method and system

A technology of fiber optic gyroscope and self-checking system, applied in the field of fiber optic gyroscope, can solve problems such as affecting the normal operation of the system, degradation of photoelectric conversion performance, failure, etc., and achieve the effect of simple and practical self-checking process

Pending Publication Date: 2021-04-27
株洲菲斯罗克光电科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a high-precision sensor, the performance of the fiber optic gyroscope is the basis for the system to complete the target function normally. However, with the increase of the use time, some devices such as lasers, Y waveguides, photoelectric conversion, etc. have performance degradation or even failure. , will affect the normal operation of the entire system

Method used

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  • Optical fiber gyroscope self-checking method and system
  • Optical fiber gyroscope self-checking method and system
  • Optical fiber gyroscope self-checking method and system

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0033] This embodiment discloses a method for self-testing of a fiber optic gyroscope, and the system block diagram of the fiber optic gyroscope is referred to figure 1 , which is equipped with a temperature control unit around the laser. Such as figure 2 As shown, the method of this embodiment includes the following steps to realize the self-test of the temperature control unit:

[0034] Step S1, obtain the initial value, the initial value includes: the wavelength λ1 at the laser temperature t1 corresponding to the normal operation of the system, and the wavelength λ2 at the comparison temperature t2; and the comparison temperature t2 is selected within the laser operating temperature range and far away from the normal system The value of the laser temperature in the working state.

[0035] Step S2, after the self-check process starts, firstly set the temperature of the laser to t1.

[0036] Step S3 , adjusting the delay of the Y waveguide to obtain the driving voltage V1...

Embodiment 2

[0041] The optical fiber gyroscope will perform light intensity identification during the detection process, so the light intensity stability of the laser has a great influence on the final detection accuracy. In order to ensure the stability of the laser light intensity, the fiber optic gyroscope will use a constant current drive method to ensure the stability of the laser output light intensity. For this reason, on the basis of the above-mentioned embodiment 1, this embodiment adds the self-test of the laser.

[0042] The wavelength of the light emitted by the laser will change due to the temperature. Generally speaking, the temperature change of the laser will cause the volume of the resonant cavity to change, which will affect the output wavelength of the laser. The higher the temperature, the longer the wavelength. The wavelength change will lead to lower accuracy of the fiber optic gyroscope, so the high-precision fiber optic gyroscope will use the temperature control un...

Embodiment 3

[0046] This embodiment is further optimized on the basis of the above two embodiments. That is, after the self-test of the temperature control unit, the self-test of the Y waveguide is further performed. Among them, the Y waveguide is a multifunctional optical module containing lithium niobate crystals, where lithium niobate is a substance whose refractive index changes with the applied voltage, so the light transmission can be adjusted by adjusting the electric field applied to the lithium niobate crystals. The time delay after lithium perniobate crystal has a linear relationship within a certain range.

[0047] Such as Figure 4 As shown, the Y-waveguide self-test in this embodiment includes the following steps:

[0048] Step S21, setting the temperature of the laser at the system preset working temperature.

[0049] Step S22, setting the driving current of the laser as the preset working current of the system.

[0050] Step S23 , adjusting the driving voltage of the Y w...

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Abstract

The invention belongs to the technical field of optical fiber gyroscopes and discloses an optical fiber gyroscope self-checking method and system which are used for conveniently realizing self-checking of an optical fiber gyroscope under without adopting extra devices. The method comprises the following steps of realizing self-inspection of a temperature control unit: initial values are acquired, wherein the initial values comprise a wavelength lambda 1 at a laser temperature t1 corresponding to normal operation of a system and a wavelength lambda 2 at a comparison temperature t2; after the self-checking process is started, the temperature of a laser is set to be t1; the time delay of aY waveguide is adjusted, and a driving voltage V1 obtained when the detection light intensity is adjusted to the minimum is acquired. the temperature of the laser is set to be t2; the time delay of the Y waveguide is adjusted, and a driving voltage V2 obtained when the detection light intensity is adjusted to the minimum is acquired; and the ratio of V2 to V1 is calculated, the ratio is compared with the ratio of lambda 2 to lambda 1, whether the relative relation of the two ratios is in a normal working range or not is judged, and if so, it is judged that the temperature control unit can work normally.

Description

technical field [0001] The invention relates to the technical field of fiber optic gyroscopes, in particular to a method and system for self-inspection of fiber optic gyroscopes. Background technique [0002] As a high-precision sensor, the performance of the fiber optic gyroscope is the basis for the system to complete the target function normally. However, with the prolongation of the use time, some devices such as lasers, Y waveguides, photoelectric conversion, etc. have performance degradation or even failure. , will affect the normal operation of the entire system. Therefore, the sub-module self-inspection before the use process is of great value. Contents of the invention [0003] The purpose of the present invention is to disclose a fiber optic gyroscope self-inspection method and system, so as to conveniently realize the fiber optic gyroscope self-inspection without adding additional devices. [0004] In order to achieve the above purpose, the present invention d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 王已熏郝文学冯毅
Owner 株洲菲斯罗克光电科技股份有限公司