Analysis Of A Mechanically Dithered Ring Laser Gyro Lock-In And Technics Improvement

A type of laser gyro is developed for matching with domestic fourth-generation fighter aircraft.It is developed by ourselves as Western countries imposed the blockade on techniques,how to conquer the key technologies of constraints the performance of laser gyro in development,production process,is currently an urgent need to address the problem.In the developing process,"Lock-In" is the main obstacle.With "Lock-In" there are many technical difficulties to be worked out in development of high-precision laser gyro.To the practical degree,we must first overcome the "Lock-In".But it must exist because the "Lock-In"is a result of mutual coupling between the back-scattering of mirror,and there is no mirror's scattering is zero.So in practice bias frequency technology must be used.Reduce the "Lock-In"threshold,developing an effective bias frequency technology formed the history of laser gyro technology research.Therefore,there a focus on how to effectively reduce the static "Lock-In"of a type of laser gyro.In this paper,complete the following tasks:1.We design and develop automated test equipment in "Lock-In" test.Results of test showed that the reliability of measurement systems meets the design requirements:zone locking is 0.6 °/s can be received when the test accuracy is 0.01 °/s.2.The scattering is reduced through improving the design of the film system of the reflector,so the lock-in is decreased 0.5 °/s.3.The lock-in area decreased by 0.15 °/s,reached 0.35 °/s,by optimizing the assembly process,reducing the assembly process of various factors on the quality of mirrors.4.Analysis the influence of jitter demodulation on lock-in,and minishing the lock-in through optimizing the with noise and parameters of demodulation he top of the impact and by.Experimental results showed that this type of laser gyro static lock-in has been markedly improved,it is reduced from 1°/s to 0.35°/s,exceeding the expected,and we achieved the automation of measurement of the static lock-in area.This article focuses on the engineering applications of laser gyro,the main purpose is to study the lock-in threshold of gyro in the actual production,to help engineers quickly analyze and resolved it.