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在激光陀螺动态测角过程中,瞄准并建立一个可靠的零点是比较关键的问题。利用双光束干涉原理设计了指零仪的光路,描述了其瞄准原理和电路组成,分析了研制过程中应该注意的问题。利用高精度速率偏频激光陀螺的输出脉冲对指零仪进行了稳定性和重复性的实验,在转速为144(°)/s时指零仪的指零精度优于±0.1″,指零重复精度优于±0.05″。结果证明,所研制的指零仪具有很高的指零精度和良好的动态响应能力,验证了设计的合理性和可行性,为高精度激光陀螺测角仪的研制奠定了良好的基础。
In the dynamic goniometry of laser gyro, it is a key issue to aim and establish a reliable zero point. The optical path of finger zero instrument is designed by using the theory of double beam interference. The aiming principle and circuit composition are described. The problems that should be paid attention to in the development process are analyzed. The experiment of stability and repeatability was carried out by using the output pulse of the high-precision rate-shifting laser gyro. When the rotation speed was 144 (°) / s, the zero precision of the zero instrument was better than ± 0.1 “ Repeatability better than ± 0.05 ”. The result proves that the zero index instrument developed has high precision and good dynamic response, verifies the rationality and feasibility of the design, and lays a good foundation for the development of the high precision laser gyro goniometer.