A Method for Improving Light Intensity Stability of a Total Reflection Prism Laser Gyro Based on Series Correction and Feedforward Compensation

The instability of scale factor and null shift are closely related to the change of the light intensity of a total reflection prism laser gyro (TRPLG). To improve the light intensity stability, the light intensity stabilization principle of TRPLG was analyzed, and a mathematical model of light inten...

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Bibliographic Details
Published inIEEE access Vol. 8; pp. 13651 - 13660
Main Authors Tao, Yuanbo, Li, Sihai, Fu, Qiangwen, Zheng, Jiangtao, Liu, Shiming, Yuan, Yanhua
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
bias stability
Compensation
dynamic and steady-state performance
Feedback control
feedforward compensation
Feedforward systems
Laser excitation
Laser stability
Laser transitions
Light
light intensity stability
Luminous intensity
Mathematical model
Reflection
series correction
Stability analysis
Thermal stability
Total reflection prism laser gyro
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Summary:The instability of scale factor and null shift are closely related to the change of the light intensity of a total reflection prism laser gyro (TRPLG). To improve the light intensity stability, the light intensity stabilization principle of TRPLG was analyzed, and a mathematical model of light intensity stabilization system was established. Aiming at the problem that original system has a long adjustment time, a series correction method of adding a proportional integral differential (PID) link in the forward channel was adopted. According to the third-order optimal design, the original I-type third-order overdamped system was optimized to the new II-type third-order underdamped system, which ultimately improved the system's dynamic and steady-state performance. Feedforward compensation was used to introduce the light intensity disturbance during the longitudinal mode hopping into the closed-loop system, which realized the full compensation of the light intensity error and improved the light intensity characteristics during the longitudinal mode hopping. Combined with the above two methods, experimental results showed that the new system with feedforward compensation improved the light intensity stability by 32% at constant temperature and by 40% at variable temperature, with the TRPLG's bias stability improved by more than 16% at constant temperature and by 22% at variable temperature.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2020.2966302