A self-testing method for power-on self-test of optical fiber gyroscope

Abstract

The invention relates to an optical power power-on self-test method for a fiber-optic gyroscope.The method includes: step S1, the fiber-optic gyroscope is powered on to enable operation of internal devices, and after light source output is stable, an FPGA (field programmable gate array) controls the fiber-optic gyroscope to stably operate at a non + / -pi / 2 phase position; step S2, a detector feeds back detection signals, the FPGA acquires adjacent half-cycle amplitude differences of the detection signals; step S3, the FPGA compares to determine whether the amplitude differences are within a set range or not, if yes, normality of optical power and the internal devices of the fiber-optic gyroscope is confirmed, and if not, a fault signal is outputted through an output interface.Compared with the prior art, the optical power power-on self-test method for the fiber-optic gyroscope has the advantages of simplicity and convenience in utilization, implementation without addition of other devices, applicability to all digital closed-loop fiber optic gyroscopes, realization of an optical power power-on self-test function and significant practical value.

Description

technical field [0001] The invention relates to the field of fiber optic gyroscopes, in particular to a method for self-checking and testing the optical power of fiber optic gyroscopes. Background technique [0002] A gyroscope is an angular rate sensor, a device that is sensitive to relative inertial spatial angular motion, and is currently the main sensor used to determine the spatial motion attitude of a moving body. It can be used in various fields of sea, land, air and space. This requires fiber optic gyroscopes to have very high reliability, storage life and service life. When starting up, it is also very important to judge whether the fiber optic gyro is working normally. However, in the current field of fiber optic gyroscopes, there are almost no fiber optic gyroscopes with power-on self-test function. Therefore, there is an urgent need for a fiber optic gyroscope with a power-on self-test function. [0003] Generally, the digital closed-loop fiber optic gyroscop...

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Problems solved by technology

[0004] Chinese patent CN102706362A discloses an optical power self-correction method of a fiber optic gyroscope and a high-precision fiber optic gyroscope using the method. The method extracts the optical interference signal, and collects the comb-shaped peak value D when the bias phase of the optical interference signal is near 0. i , and for the collected N comb-shaped peaks D i Integrate to get D int And compare it with the optical power value of the fiber optic gyroscope in stable operation, and control the driving current of the light source according to the comparison value, and then adjust the output optical power of the light source, but the calculation formula of the integral solution is complicated, which increases the operating burden of the processor

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