A light intensity stabilization control system for all optical paths of a serf atomic spin gyroscope

Abstract

The invention discloses a full-light-path light intensity stable-controlling system of an SERF atomic self-spinning top. A liquid crystal phase delayer is utilized to inhibit pumping laser of the SERFatomic self-spinning top and detect the light intensity variation of the laser, and thus the stability of output signals of the SERF atomic self-spinning top is improved. According to the method, a photoelectric detector is firstly utilized to detect laser split by a beam splitter prism from a main pumping laser and detection laser path, detection signals are fed back to a digital controller through an analog-digital converter (ADC), the digital controller produces a PID control law based on a PID algorithm, the phase delay amount of the liquid crystal phase delayer is controlled through a digital-analog converter (DAC), control of laser intensity transmittance is achieved, and thus stable control of the intensity of pumping laser and detection laser is achieved. The beam splitter prism is arranged behind a photoelastic modulation module in a detection light path, thus the detection laser intensity variation before the laser enters an alkali metal air chamber is inhibited, stable control of full-light-path light intensity of the SERF atomic self-spinning top is achieved, the meanwhile miniaturization of the SERF atomic self-spinning top is facilitated.

Description

technical field [0001] The invention relates to a SERF atomic spin gyroscope light intensity stabilization control system for all optical paths, in particular to a liquid crystal phase retarder-based light intensity stabilization control system, which can be used for SERF atomic spin gyroscope laser light intensity stabilization control to suppress laser light intensity The fluctuation reduces the gyro drift of the SERF atomic spin gyroscope, which is beneficial to the miniaturization of the SERF gyroscope. Background technique [0002] SERF atomic spin gyroscope is the third generation of new gyroscope after electromechanical gyroscope and optical gyroscope. It uses atomic spin to replace mechanical rotor, and its theoretical accuracy can reach 10 -8 ° / h is one of the important development directions of ultra-high precision inertial navigation for a new generation of moving carriers. [0003] According to the SERF atomic spin gyroscope error transfer relationship, the fluc...

AI Technical Summary

Problems solved by technology

Method 1 has poor stability, and changing the laser diode injection current and temperature will change the frequency of the output laser. Method 2 has high stability accuracy, but the traditional method is to use an integrated acousto-optic modulator or electro-optic modulator, which cannot be integrated into a small SERF In the pumping and detection optical path of the atomic spin gyroscope, and the electronic control system generally uses analog circuits, the response speed is slow and the control accuracy is not high

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