Research On The Temperature Compensation Technology Of Closed-Loop Fiber Optic Gyro

Fiber Optic Gyroscope is a kind of angular rate sensor based on Sagnaceffect. In the gyro research and manufacturing field, China has dropped behindsome developed countries as though China has made a progress so far. Thetemperature influence on the optic gyroscope is one of the problems. It presentsthe theoretical analysis of the temperature compensation technology of theclosed-loop IFOG in this paper and a new temperature compensation scheme isdiscussed. Experiment has been performed to verify the scheme.Firstly, the basic theory of the optic gyroscope is systemically presented inthis paper, including the principle, the classification and the performanceevaluation of the optic gyroscope. A further study is carried out to find out theerror source of the closed-loop IFOG and the thermal performance of each partis also analyzed.Secondly, this paper put a high premium on the scheme of the temperaturecompensation for the closed-loop IFOG that based on DSP. The temperaturedrift induced by the fiber coil,light source and integrated optic chip which areeasily influenced by temperature is the key element of the temperature error ofthe IFOG. In this paper, the temperature compensation focus on the fiber coiland light source. Not only the precision but also the warm-up time of thesystem can be improved by taking such measures as the modification of thefiber coil temperature measuring structure, stabilizing the light power and thewavelength of the light source respectively, applying a series of advancedcontrol method.Finally, experiment is performed to test the IFOG after temperaturecompensation. The result shows that the temperature compensation scheme iseffective to improve the precision and warm-up time of the whole system. Theconclusion of this paper can be used as the reference to the continued research.