Fast self-detection method of starting of fiber-optic gyroscope

Abstract

Provided in the invention is a fast self-detection method of starting of a fiber-optic gyroscope. Linear fitting is carried out on corresponding demodulation values to obtain a loop gain value; and the loop gain value obtained by testing fitting is compared with a preset threshold to determine a loop state of a fiber-optic gyroscope. With the software method, the self-detection problem of fiber-optic gyroscope starting is solved; and the modulation and demodulation characteristics of the fiber-optic gyroscope are utilized fully. The method is implemented simply; the complexity of the fiber-optic gyroscope software is not increased; and the normal operation of the fiber-optic gyroscope after startup is not affected. The detection speed is fast, the required time is short, and time for providing needed detection information and results is less than 1ms normally. The detection result is flexible; a detection result can be provided inside the fiber-optic gyroscope software; and an upper compute also can carry out processing to obtain a result. The detection information is more comprehensive and the detection result is more reliable. The provided information includes the overall loop ofthe fiber-optic gyroscope; and when any fault occurs at any link of the loop, the fault can be reflected in the detection result.

Description

technical field [0001] The invention relates to the field of self-testing of equipment, in particular to a fast self-testing method for fiber optic gyroscope startup. Background technique [0002] Fiber optic gyroscope is an angular velocity sensor based on the Sagnac effect. The rotation causes a phase difference between the two oppositely propagating beams of light in the sensitive ring, which is proportional to the rotational speed. The two beams of light will interfere at the output end, and the corresponding rotational speed can be demodulated by detecting the change of light intensity. Due to the good reciprocity structure of the fiber optic gyroscope itself, with the increasing maturity of the device and technology level, the fiber optic gyroscope has achieved very superior performance at present. Due to the advantages of no dynamic parts, high reliability, large measurement range, shock resistance, small size, light weight, low cost, and suitable for mass productio...

AI Technical Summary

Problems solved by technology

This is very unfavorable for the size control of the circuit board itself

[0007] In addition, the increased circuit part for detecting optical power has its own reliability problems. When the increased electronic components work abnormally, the detection information will be misreported and falsely reported, which will affect the normal use of optical fibers.

The more important problem is that the optical power reaching the detector is only a part of the loop gain, and the failure of the detection circuit will also cause the abnormal operation of the fiber optic gyroscope, but the detection of the detection optical power cannot guarantee the normal operation of the overall loop of the fiber optic gyroscope

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