Thermal characteristics and thermal compensation of four frequency ring laser gyro

This paper studies "warm-up" and controlled temperature ramp processes of a four frequency RLG and shows that temperature is the primary factor to bias the output of the gyro. The "warm-up" process can be divided into three sections corresponding to turn-on bias section (TBS), fluctuation bias section (FBS) and stabilization section (SS). For the controlled temperature ramp process, a similar phenomenon is obtained, plus a bias ramp. The experiment shows that frequency sum (SF) is approximately linear to temperature and can be calculated as the temperature strategic point. Bias can be compensated mostly by temperature, temperature gradient and temperature rate.