Component-type optical fiber drilling deformeter

Abstract

The invention discloses a component-type optical fiber drilling deformeter which comprises a strain cylinder, an end cover, at least one bent beam, at least one measuring optical grating, a top cover, an optical cable and a ground demodulating device; the strain cylinder is used for receiving a strain; the end cover is arranged at one end of the strain cylinder and used for sealing; the at least one bent beam is arranged in the internal part of the strain cylinder and used for changing the deformation of the strain cylinder into an axial displacement; the at least one measuring optical grating is fixed between the middle part of the bent beam and the end cover and used for measuring the strain; the top end is arranged at the other end of the strain cylinder and used for protecting the internal part of the component-type optical fiber drilling deformeter and sealing; the optical cable is used for connecting the component-type optical fiber drilling deformeter arranged at the bottom of a well and the ground demodulating device; and the ground demodulating device is used for demodulating and measuring the wavelength change of the grating to obtain the ground strain value. With the adoption of the deformeter provided by the invention, the problems of electromagnetic interference, lightning resistance, null shift and the like in the existing drilling deformeter can be solved.

Description

technical field [0001] The invention relates to the technical field of seismic detection, in particular to a component type optical fiber drilling strain gauge. Background technique [0002] Under the action of regional stress field, the crust will be deformed, and the borehole strain observation is an important means to study the deformation of the crust and the change of the stress field. Borehole strain gauges can continuously record the crustal deformation at and before and after earthquakes and volcanic activities in minutes or even close to seismic sampling time. Therefore, it plays an important role in earthquake prediction and geophysical research. [0003] Existing borehole strain gauges include bulk strain gauges and component strain gauges (Qiu Zehua et al., "Development Status of Borehole Strain Observation Abroad", Acta Seismological Sciences, 2004). But no matter what kind of strain gauge, electrical sensors are used for detection. For example, the FZY-1 bor...

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Problems solved by technology

[0007] In view of this, the main purpose of the present invention is to provide a component type optical fiber drilling strain gauge to solve the problems of electromagnetic interference, lightning protection, zero drift and so on in the existing drilling strain gauge

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