Stress number-of-turn compensation method for ring tail fibers of fiber optic gyroscope

Abstract

The invention relates to a stress number-of-turn compensation method for ring tail fibers of a fiber optic gyroscope. Three technical measures are adopted in the method to conduct stress compensationon the tail fibers of optical fiber rings, wherein the three measures are as following 1, the bending radius of a specified number of turns of tail fibers is changed to achieve stress distribution compensation of the rings; 2, the winding tension of the specified number of turns of tail fibers is changed to achieve stress distribution compensation of the rings; 3, the colloid modulus of the specified number of turns of tail fibers is changed to achieve stress distribution compensation of the specified number of turns of tail fibers. By means of the method, good thermal symmetry and better stress distribution symmetry are both achieved, the non-reciprocity errors of the rings are effectively reduced, and the working stability of the fiber optic gyroscope is better ensured. The compensationmethod has important application value for increasing the temperature of the fiber optic gyroscope and improving vibration performance of the fiber optic gyroscope.

Description

technical field [0001] The invention relates to the technical field of fiber optic gyroscopes, in particular to a method for compensating the number of stress turns of fiber optic gyroscope pigtails. Background technique [0002] The fiber optic gyroscope is a fiber optic angular rate sensor based on the Sagnac effect, which has the advantages of small size, high precision, all solid state, long service life, and large dynamic range. The strapdown inertial navigation system based on fiber optic gyroscope has been widely used in aerospace, ship navigation and other fields. [0003] As the sensitive core of the fiber optic gyroscope, the performance of the fiber optic ring directly affects the accuracy of the gyroscope. When the environmental factors of the optical fiber loop change, the two beams of light waves propagating in the opposite direction in the optical fiber loop will produce a non-reciprocal phase difference. This non-reciprocal phase shift and the Sagnac phase s...

AI Technical Summary

Problems solved by technology

The optical fiber loops wound by the quadrupole symmetrical winding method have shown to have better temperature characteristics than the original spiral winding method, but there is still a gap between the existing quadrupole symmetrical winding method and the ideal quadrupole symmetry, and it is impossible to guarantee every Consistency of Layer Turns

Even if the ideal symmetry of the geometric length of the ring is guaranteed, there are still differences in the stress distribution of the ring in the symmetrical part. Although it has a good suppression effect on the thermal gradient field, it still cannot effectively offset the phase caused by the stress difference.

[0007] In short, although there are a large number of improved ring winding methods, most of them are improved from the offset of the thermal field distribution of the ring. An effective method to accurately overcome the influence of stress is particularly important

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