Method for detecting quality of optical fiber ring for gyroscope and device thereof

Abstract

The invention relates to a method for detecting quality of an optical fiber ring for a gyroscope and a device thereof, belonging to the technical field of photo-electronic optical information. The method comprises the following steps of: connecting the optical fiber ring to be detected into an optical fiber gyroscope system; applying radial temperature excitation to the optical fiber ring to be detected; and judging equivalent asymmetric length of the optical fiber ring to be detected through measurement, and further judging the quality of the optical fiber ring. The device comprises a broadband light source, an optical circulator, an optical Y waveguide, a photoelectric detector, a heating device, two temperature measuring probes and a signal processing circuit. According to the method and the device, a concept of a pointing error temperature sensitivity coefficient is introduced; and in a measurement process, a pointing thermotropic error angle of the optical fiber gyroscope system is acquired, the pointing error temperature sensitivity coefficient of the optical fiber ring to be detected is acquired according to an acquired rotation speed signal and the pointing thermotropic error angle, and then the equivalent asymmetric length of the optical fiber ring to be detected is judged according to the pointing error temperature sensitivity coefficient, so that the measurement accuracy for judgment of the quality of the optical fiber ring is greatly improved.

Description

technical field [0001] The invention belongs to the technical fields of optical measurement and optical fiber sensing, and relates to a detection method and a detection device suitable for judging the quality of optical fiber surrounds used in optical fiber gyroscopes. Background technique [0002] The gyroscope is an inertial device used for sensitive angular velocity, and it is one of the core devices of the inertial system. Fiber Optic Gyro (Fiber Optic Gyro) is a new type of optical gyroscope developed in the past 30 years. It is a fiber optic angular velocity sensor based on the Sagnac principle. Compared with previous gyroscopes (such as traditional mechanical gyroscopes and even more advanced laser gyroscopes), it has the characteristics of no mechanical parts and high sensitivity; compared with micro-electromechanical gyroscopes, it has advantages in technical indicators and environmental adaptability; Compared with gyroscopes, it does not require ultra-high-precisi...

AI Technical Summary

Problems solved by technology

This method of using compensation technology to improve the quality of the optical fiber ring can compensate the asymmetric length of the optical fiber ring to a certain extent, but it only considers the length compensation of the two-arm pigtails connecting the optical fiber ring and the Y waveguide. Changing the relative delay time of light propagating in the two-stage optical fiber of the fiber ring, there is a linear relationship between the gyro thermal error output and the length asymmetry of the two-arm pigtails on the fiber ring, and indirectly realizing the compensation for the asymmetry of the fiber ring; and This compensation method does not consider the temperature excitation applied to the pigtails of the two arms, and it does not conform to the situation that the optical fiber ring and the pigtails on the two arms are affected by the external temperature change at the same time when the actual fiber optic gyroscope is working, and it only belongs to a specific case The working characteristics of the gyroscope do not meet the needs of practical applications

[0018] There is still a defect in the above existing technology, that is, when the temperature excitation causes the temperature gradient of the fiber ring, only the temperature of the fiber ring heating surface is used as the control parameter (usually heated from the outside), and the non-heating surface of the fiber ring is not measured ( Usually the temperature of the inner hole of the fiber ring), the established calculation model has certain errors, which cannot truly reflect the gradient of the fiber ring when it is excited by temperature

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