Fiber-optic gyroscope with stress compensation

Abstract

The invention relates to a fiber-optic gyroscope with stress compensation. On the basis that an existing fiber-optic gyroscope comprises a light source, a coupler, a Y waveguide, a fiber-optic ring, adetector and a signal processing circuit, a temperature sensor and piezoelectric ceramic are additionally arranged. The coupler is respectively connected with the light source, the detector and the Ywaveguide. A signal control circuit is respectively connected with the detector, the temperature sensor, the Y waveguide and the piezoelectric ceramic. Because the fiber-optic ring is wound with a first optical fiber and a second optical fiber, the Y waveguide is connected with the fiber-optic ring through a first optical fiber pigtail and a second optical fiber pigtail, and the first optical fiber pigtail or the second optical fiber pigtail is also wound on the piezoelectric ceramic. During working, the signal processing circuit controls the piezoelectric ceramic to perform pressure compensation on the first optical fiber pigtail or the second optical fiber pigtail wound on the piezoelectric ceramic in real time according to sensitive angular rate information and temperature informationof the fiber-optic gyroscope to balance stress values on two sides, so that zero drift of the fiber-optic gyroscope caused by stress is compensated.

Description

technical field [0001] The present application relates to the technical field of angular rate sensors, in particular to a fiber optic gyroscope with stress compensation. Background technique [0002] In the production technology of optical fiber rings, generally starting from the midpoint of an optical fiber, they are wound sequentially in clockwise and counterclockwise directions respectively. Since additional stress interference is inevitably introduced in the process, the internal stress of the optical fibers on both sides is not stable. It is completely symmetrical; and, as the number of winding layers increases, the bending radius of the winding also increases, resulting in a change in the average stress inside each layer of optical fiber. After the optical fiber ring is wound, the potting compound needs to be filled and cured to form. The curing of the potting compound will also introduce stress interference. Therefore, after the fiber optic ring is completed, there i...

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Problems solved by technology

Therefore, after the fiber optic ring is completed, there is a deviation in the stress of the optical fibers on both sides of the fiber ring that is symmetrical about the midpoint, and this deviation will also change with the change of the ambient temperature, resulting in a drift in the zero position of the fiber optic gyroscope and a loss of accuracy. serious

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