Alternating-current frequency stabilization system and method for four-frequency laser gyroscope

Abstract

The invention belongs to a laser gyroscope technology, and relates to a frequency stabilization system and method for a four-frequency laser gyroscope. The frequency stabilization system for the four-frequency laser gyroscope comprises a four-frequency laser gyroscope and an alternating-current frequency stabilization circuit, wherein the four-frequency laser gyroscope comprises two planar mirrors and two groups of spherical mirror for controlling a cavity length; the alternating-current frequency stabilization circuit comprises a photoelectric converter, a band-pass filter, a phase-sensitive detector, a rectifier, a PID (Proportion Integration Differentiation) controller, a summator and a voltage amplifier; and the voltage amplifier is connected with frequency stabilization piezoelectric ceramics of the two spherical mirrors. In the invention, the cavity length of the four-frequency laser gyroscope is modulated by applying an alternating-current voltage signal to the frequency stabilization piezoelectric ceramics, a frequency stabilization error signal is obtained by performing band-pass filtering and phase-sensitive demodulation and rectification, and the error signal is stabilized at a zero value through closed loop control, so that frequency stabilization of the four-frequency laser gyroscope is realized. Due to the adoption of the system and the method, frequency stabilization control of the four-frequency laser gyroscope is simplified greatly, and the frequency stabilization accuracy is increased greatly.

Description

technical field [0001] The invention belongs to laser gyro technology, and relates to a four-frequency laser gyro frequency stabilization system and a frequency stabilization method. Background technique [0002] Laser gyroscope is an optical gyroscope based on Sagnac effect. When the carrier rotates at a speed of Ω relative to the inertial space, the laser gyroscope will generate a beat frequency output proportional to the speed, as shown in formula (1): [0003] Δν = 4 A Lλ Ω = KΩ - - - ( 1 ) [0004] Where: Δν is the beat frequency [0005] A is the area enclosed by the ring light path [0006] L is the optical path length of the ring light path [0007] Ω is the rotational angular velocity [0008] λ is the laser working wavelength [0009] K is the scaling factor of...

AI Technical Summary

Problems solved by technology

There are four problems in light intensity difference and frequency stabilization. One is that the transmission balance of the plane mirror 2 is relatively high (the transmission of S light is as close as possible to the transmission of P light). The transmission is very different, which brings great difficulties to the coating of the mirror

The fourth is that the actual gain curve is not ideally symmetrical, so this method of frequency stabilization will cause deviations

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