Testing method of closed-loop fiber optic gyroscope threshold value

Abstract

The invention belongs to the technology of fiber optic gyroscopes, and particularly relates to a testing method of a closed-loop fiber optic gyroscope threshold value. The method comprises the following steps: firstly determining a fiber optic gyroscope invalid area, separately performing positive threshold value testing and negative threshold value testing of the linearity near a gyroscope zero output position of the invalid area, and then taking a testing value in a position of half of the width of the invalid area as a positive threshold value and a negative threshold value. According to the method, the linearity near the gyroscope zero output position in the gyroscope invalid area is used for evaluating the threshold value of a gyroscope, a zero output method is clear in gyroscope threshold value evaluation mechanism, and the closed-loop fiber optic gyroscope threshold value is truly evaluated in terms of the mechanism. Meanwhile, the method only requires finding out the invalid area near the gyroscope zero output position, and the requirements on the positional accuracy of a rotary table and the geometric tolerance of a testing fixture are low, so that testing schemes are convenient to flexibly formulate.

Description

technical field [0001] The invention belongs to the fiber optic gyroscope technology, and relates to a method for testing the threshold value of a closed-loop fiber optic gyroscope. Background technique [0002] The threshold of the closed-loop fiber optic gyroscope is the minimum input angular rate to which the gyroscope can be sensitive, which reflects the output nonlinearity of the gyroscope in the small angular rate segment. The threshold of the gyro is usually equivalent to the precision of the zero bias of the gyro, which is a small amount. Accurately obtaining the threshold of the gyro is a technical problem that needs to be solved urgently. [0003] At present, the mainstream threshold test method of closed-loop fiber optic gyroscope (such as "GJB 2426A-2004 Fiber Optic Gyroscope Test Method") refers to the evaluation method of ordinary linear instruments, as follows: input a small reference angular rate point to the gyroscope Use the output value B of the gyro at ...

AI Technical Summary

Problems solved by technology

Therefore, the mainstream threshold test method cannot obtain the true threshold of the gyroscope

[0006] Closed-loop fiber optic gyroscope does not have a threshold in theory. Due to the limitation of volume and weight in the actual application environment, the cross-coupling of optical path and circuit will cause a "lock-up effect" similar to that of laser gyroscope, making the fiber optic gyroscope invalid, so there is a gyroscope that can be sensitive Angular rate limit

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