Demodulation integral circuit for angular rate of optical fiber gyroscope and circuit control method

Abstract

The technical solution provides a demodulation integral circuit for angular rate of an optical fiber gyroscope, which comprises an inverter, an integrator, a sampler, a first switch SW1, a second switch SW2 and a switch controller, wherein the input end of the inverter is the input end of the demodulation integral circuit; the first switch SW1 is connected between the input end of the inverter and the input end of the integrator, and the input end of the integrator is further connected to the output end of the inverter; the second switch SW2 is connected between the output end of the inverter and the input end of the integrator, the output end of the integrator is connected to the input end of the sampler, and the output end of the sampler is used as the output end of the demodulation integral circuit; the sampler comprises a third switch, and the switch controller controls the on and off of the first switch SW1, the second switch SW2 and the third switch. According to the invention, the demodulation integral for an angular rate signal of the optical fiber gyroscope is realized. Compared with the prior art, the size of an optical fiber gyroscope circuit part is reduced, the cost of a circuit part is reduced, and the loss of original data is avoided.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensors, in particular to a demodulation integral circuit and a control method for the angular rate of an optical fiber gyroscope. Background technique [0002] Fiber optic gyroscope is a new type of all-solid-state inertial instrument that utilizes the Sagnac effect to be sensitive to rotation angle or rate of rotation. It is widely used in aviation, aerospace, navigation, ground weapon systems and industrial fields, and is one of the most widely used new gyroscopes at present. The fiber optic gyroscope is composed of two parts: the optical path and the circuit. The optical path is mainly composed of a light source, a Y waveguide, and a detector to form a Sagnac interferometer. The circuit part realizes the functions of interferometer signal extraction, angular rate signal demodulation and integration, modulation signal generation, and ladder wave closed-loop feedback. Interferometer sign...

AI Technical Summary

Problems solved by technology

[0003] The usual method of interferometer angular rate signal demodulation is to use a high-speed AD converter. Under the control of the pulse generator, multiple samplings are performed during the duration of the two modulation states, and the angular rate demodulation is obtained by averaging the sampled data and calculating the difference. However, the discrete nature of AD sampling means a large loss of original information; in order to achieve closed-loop proportional-integral control, signal accumulati

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