Method for improving angular displacement measurement accuracy of optical fiber gyroscope

Abstract

The invention discloses a method for improving angular displacement measurement accuracy of an optical fiber gyroscope. The method comprises the following steps of: (1) fixing the optical fiber gyroscope on a high-accuracy rotary table to keep a measuring shaft of the optical fiber gyroscope in parallel to a rotating shaft of the high-accuracy rotary table; (2) marking scale factors of the optical fiber gyroscope at different rotary table input angular rates to acquire a correspondence table between the angular rates and the scale factors; (3) taking the optical fiber gyroscope off the high-accuracy rotary table and fixing on a measured rotating device to keep the measuring shaft of the optical fiber gyroscope in parallel to the rotating shaft of the measured rotating device; (4) solving an average value of output values of the optical fiber gyroscope in a testing time under the condition that the measured rotating device is static; (5) rotating the measured rotating device and continuously recording each output value of the optical fiber gyroscope; and (6) calculating a rotation angle, namely the angular displacement of the rotating device by using the correspondence table in thestep (2), the output average value in the step 4 and each output value in the step (5).

Description

technical field [0001] The invention designs a measurement technology, and in particular relates to a technology for improving the measurement accuracy of an optical fiber gyroscope for measuring angular displacement. Background technique [0002] The fiber optic gyroscope is a sensor for measuring angular velocity. If the fiber optic gyroscope is installed on the rotating device, and the angular velocity of the rotating device is measured and integrated, the angular displacement of the rotating device due to the rotation can be obtained. Because the fiber optic gyroscope has the characteristics of small size and short start-up time, it is especially suitable for the application of angular displacement measurement. [0003] The fiber optic gyroscope is a sensor that measures angular velocity, and its output expression is: [0004] F=KΩ+D 0 (5) [0005] In the formula, F is the output of the fiber optic gyroscope, K is the scaling factor of the fiber optic ...

AI Technical Summary

Problems solved by technology

[0015] This method can achieve relatively high accuracy, but it does not take into account the nonlinear relationship between the scale factor of the fiber optic gyroscope and the input angular velocity, and uses a unique scale factor in the entire measurement range, resulting in inaccurate results.

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