Digitization and compensation of the open-loop fiber optic gyroscope

The fiber optic gyroscope plays an important role in the family of inertia devices. But in the dynamic condition, Because of the nonlinear output and the nonlinear graduation factor and zero-bias by temperature, the open-loop FOG can't apply in some fields. Therefore, how to reduce the bad affection by temperature is urgent. This article proposed a new method to digitize the open-loop FOG and compensate the temperature error and nonlinear graduation factor. This detection circuit for FOG is mainly based upon C8051F350 MCU. There are 24 bit A/D converter and temperature sensor. What is more important, its area is only 5×5 mm², which is propitious for minimizing and engineering. By analyzing and researching a great of experience data, we build the model of zero-bias temperature character, graduation factor temperature nonlinear character and output nonlinear character. Then we compensate the character mentioned above. Test result shows that the system reaches the expected performance. It is meaningful for engineering, minimizing and application.