A method for detecting the outer torsion angle of panda-shaped polarization-maintaining optical fiber

Abstract

The invention discloses a method for detecting the outer torsion angle of a panda polarization maintaining optical fiber. The detection method comprises the steps that the vertical distance between light ray convergence points corresponding to two stressed zones are detected on the basis of the light ray convergence function of the stressed zones of the panda polarization maintaining optical fiber, and the outer torsion angle of the optical fiber is worked out through the vertical distance between the convergence points of the stressed zones according to the geometrical optic principle. The method is low in detection error and high in precision and a detection device is easy to operate; meanwhile, the detection device can be conveniently arranged in an optical fiber winding machine so that the optical fiber can be detected in real time, the low-torsion winding of the optical fiber can be achieved, and reversed torsion of the polarization maintaining optical fiber can also be achieved.

Description

technical field [0001] The invention relates to the field of optical fiber sensors, in particular to a method for detecting the outer torsion angle of a panda-type polarization-maintaining optical fiber. Background technique [0002] As the main component of the sensing part of the sensor, the optical fiber plays an irreplaceable role in optical sensing; the optical fiber ring is a sensitive part in the angular rate sensor, and the stability of its performance directly affects the stability of the sensor's performance. At present, with the increasing development and maturity of polarization-maintaining fibers, most angular rate sensors use polarization-maintaining fibers to make fiber rings, and polarization-maintaining fibers have become the key components of such sensors. However, the polarization-maintaining fiber will be twisted during the process of making and winding into a loop. This twist will cause the polarization state of the light to change during the propagation...

AI Technical Summary

Problems solved by technology

However, the polarization-maintaining fiber will be twisted during the process of making and winding into a loop. This twist will cause the polarization state of the light to change during the propagation of the fiber, which will cause the instability of the sensor performance and bring measurement errors. Therefore, the measurement of the polarization-maintaining fiber The twist is very important

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