Beam intensity stability control for laser gyro

In view that our current-stabilized power supply doesn't meet the requirement of laser gyro's theory, this paper discusses the theory, function, realization and difficulty of beam intensity stability control of laser gyro, and puts forward a scheme for restraining the coupling effects between three types of control. Based on the scheme, an all-digital integration circuitry of laser gyro based on TMS320F2812 is designed, and the beam intensity stability power supply of laser gyro is realized. Various experiments on a four-frequency laser gyro are conducted using the designed circuits. The results shows that the digital integration circuit is effective and can be applied in controlling coupling, and the four-frequency laser gyro's null shift vibration can be effectively controlled under the high- and low-temperature process. Both the theory and the experiment verify that the current-stabilized power supply does not meet the principle's requirements, and should be replaced by the beam intensity stability power supply.