Encapsulation method of optical fiber sensing coil

Abstract

The invention discloses an encapsulating method of an optical fiber sensing coil. The method comprises twice encapsulation of the optical fiber sensing coil, namely a primary encapsulation and a secondary encapsulation of the optical fiber sensing coil. The encapsulation method comprises the following steps: firstly, performing primary encapsulation, namely internal encapsulation on the optical fiber sensing coil, wherein a gum dipping encapsulation mode is adopted, and gum for encapsulation has high thermal conductivity; secondarily, performing secondary encapsulation, namely external encapsulation on the optical fiber sensing coil; adhering the optical fiber sensing coil in a protective cover of the coil, and pouring and encapsulating with low-thermal conductivity and low-stress gel. For the optical fiber sensing coil encapsulated by adopting the method, the introduction of external heat of the coil can be effectively prevented so as to reduce the temperature gradient inside the coil, so that the temperature drift error of a fiber-optic gyroscope can be reduced.

Description

technical field [0001] The invention relates to an optical fiber gyro system, in particular to a packaging method for an optical fiber sensing loop. Background technique [0002] The interferometric fiber optic gyro interferometer mainly includes five parts: light source, optical waveguide, optical fiber sensing ring, polarizer and detector. Among them, the optical fiber sensing ring is formed by winding polarization-maintaining optical fiber or low-birefringence optical fiber in a certain way (such as four-level symmetry). The fiber optic gyro system can measure the rotational angular velocity of an object by measuring the phase difference between two beams of light in a fiber optic sensing loop. [0003] Environmental factors can affect the measurement of the phase difference between two beams of light waves transmitted oppositely in the optical fiber sensing loop, causing measurement errors during measurement. These environmental factors mainly include: temperature, vib...

AI Technical Summary

Problems solved by technology

[0005] Similarly, in the traditional fiber optic gyroscope, the selection of packaging materials for the fiber optic sensing ring is not perfect, and it is necessary to conduct detailed research on the specific characteristics of the packaging materials, such as the thermal conductivity, hardness and modulus of the packaging materials, etc.

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