Broadband-light-interference-characteristic-based dynamic starting method of closed-loop fiber optic gyro

Abstract

The invention discloses a broadband-light-interference-characteristic-based dynamic starting method of a closed-loop fiber optic gyro. When a gyro is in a started state, a search algorithm is utilized to search an interference light intensity maximum value point closest to a starting point on a interference light intensity curve of a sagnac interferometer, additional phase shift is applied to thegyro and the light intensity values before and after the phase shift is applied are compared to determine a phase shift compensation value of the gyro, then a measured phase shift value of the gyro is obtained in a closed loop state, and the real sagnac phase shift value generated due to rotation of the gyro is obtained by means of the phase shift compensation value and the measured phase shift value. In the invention, the interference characteristic of broad-band light passing through the sagnac interferometer is utilized to correct error probably generated under the condition that the closed-loop fiber optic gyro is dynamically started, and the real sagnac phase shift is determined, thus the angular speed measured under the condition that the gyro is dynamically started is ensured to beconsistent with the real angular speed, dynamic starting of the fiber optic gyro is realized, and the application range of the fiber optic gyro under special conditions is widened.

Description

technical field [0001] The invention relates to the field of optical fiber sensing in optoelectronic technology, in particular to a dynamic starting method of a closed-loop optical fiber gyroscope based on wide-spectrum optical interference characteristics. Background technique [0002] The fiber optic gyro is a sensor sensitive to angular velocity. Its working principle is based on the Sagnac effect, that is, when the ring interferometer rotates, a phase shift proportional to the rotation speed is generated. By detecting the phase shift, the position of the ring interferometer can be obtained. The angular velocity of the system. Fiber optic gyroscopes are widely used in navigation and attitude control systems because they have many advantages such as all-solid-state, large bandwidth, low cost, wide precision coverage, and strong anti-interference ability. [0003] The earliest fiber optic gyroscopes used an open-loop signal processing system, but due to the limitations of ...

AI Technical Summary

Problems solved by technology

Therefore, in the current practical application, the start-up of the fiber optic gyroscope is required to be carried out under static conditions or when the rotational speed is small (corresponding to the Sagnac phase shift in the range of [-π, π]), which limits the need for dynamic start-up of the fiber optic gyroscope, etc. Applications under special conditions

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