Protection device of fiber grating detector

Abstract

The invention discloses a protection device of a fiber grating detector, which relates to the technical field of optical fiber sensing and comprises a main body structure and sealing structures arranged at two ends of the main body structure. The main body structure comprises an outer sleeve and a transition pad, one end of the transition pad is connected with the fiber outlet end of the fiber grating detector, the other end of the transition pad is in pressing fit with the sealing structure at the upper end of the main body structure, the outer sleeve sleeves the fiber grating detector and the transition pad, and the sealing structure at the lower end of the main body structure is connected with the bottom end of the fiber grating detector; a light inlet optical fiber of the fiber grating detector sequentially penetrates through the fiber outlet end, the transition pad and the sealing structure at the upper end of the main body structure and then is led out of the protection device; a light-emitting fiber of the fiber grating detector passes through the fiber-out end, passes through a gap channel between the fiber grating detector and the outer sleeve, passes through the sealing structure at the lower end of the main body structure and then is led out of the protection device. While underground sealing protection is provided for the detector, vibration detection of the detector is not affected.

Description

technical field [0001] The present application relates to the technical field of optical fiber sensing, in particular to a protection device for a fiber grating detector. Background technique [0002] Optical fiber sensing devices are based on the sensitivity of optical fiber components to the external environment, and are used to detect related signals according to the changes in optical parameters with environmental factors. They have the advantages of wide frequency bandwidth, high sensitivity, and no electromagnetic interference. They are mostly used in mines and rocks Signal detection in complex engineering environments such as , railway and underground. For example, the optical fiber sensing device can be a fiber grating vibration sensor, which uses fiber grating sensing technology to detect vibration components in three directions in the downhole environment, thereby realizing high-precision wave detection in complex downhole environments. [0003] When actually maki...

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Problems solved by technology

[0003] When actually making a fiber grating detector, it is necessary to test the frequency response and other characteristics of the fiber grating detector on a shaking table. The shaking table has weight requirements for the fiber grating detector to be tested. Generally, the weight of the fiber grating detector should not be too large. And considering the complex downhole environment, the geophone needs to have strong pressure-resistant sealing performance, which will undoubtedly increase the difficulty of packaging the geophone, and will also increase the weight of the geophone

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