Fiber bragg grating sensor applied to underground stress monitoring

Abstract

The invention relates to the technical field of fiber bragg grating sensors, and in particular, relates to a fiber bragg grating sensor applied to underground stress monitoring, wherein the fiber bragg grating sensor comprises a sensor body and a detection contact, and the lower end of the sensor body is fixedly connected with a connecting assembly facilitating connection of the sensor body and a transmission line; and the sensor body is fixedly connected with the transmission line through the connecting assembly, the other end of the transmission line is fixedly connected with the detection contact, and a protection assembly with a supporting structure is arranged on the outer side of the transmission line. According to the invention, through the arrangement of the protective cover, a drying plate and a groove, during use, the sensor body and the transmission line can be separately carried and are quite convenient, through the spiral connection of the protective cover and the sensor body, the normal use of the sensor can be ensured, and meanwhile, the sensor has quite good stability; and the protective cover and a rotating clamping ring are arranged, so that the influence of an outer side humid environment on the device can be avoided, and the drying plate is arranged to ensure that the interior of the protective cover is in a dry environment.

Description

technical field [0001] The invention relates to the technical field of optical fiber grating sensors, in particular to an optical fiber grating sensor applied to underground stress monitoring. Background technique [0002] Fiber Bragg grating sensors can realize direct measurement of physical quantities such as temperature and strain. Since the fiber Bragg grating wavelength is sensitive to temperature and strain at the same time, that is, the temperature and strain simultaneously cause the fiber Bragg grating coupling wavelength to move, making it impossible to measure the fiber Bragg grating coupling wavelength shift by measuring the temperature and strain. Therefore, solving the problem of cross-sensitivity and realizing the differential measurement of temperature and stress are the prerequisites for the practical application of the sensor. The basic principles of these technologies are to measure stress and temperature changes to realize the differential measurement of te...

AI Technical Summary

Problems solved by technology

[0003] Some optical fiber grating sensors used underground require relatively long transmission lines. The transmission lines are easy to carry and cause damage when carried. Once the transmission line is damaged, the optical fiber grating sensor needs to be replaced, causing huge economic losses. At the same time The underground conditions are complicated and relatively humid, which is easy to affect the fiber grating sensor. Therefore, in view of the above problems, a fiber grating sensor applied to underground stress monitoring is proposed.

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