Optical fiber strain and temperature simultaneous calibration device and method based on Brillouin scattering

Abstract

The invention belongs to the technical field of distribution-type optical fiber sensing measurement, in particular to an optical fiber strain and temperature simultaneous calibration device and a method based on Brillouin scattering. The optical fiber strain and temperature simultaneous calibration device comprises optical fiber Brillouin sensing measurement equipment, a shockproof support frame, a metal pipe and constant-temperature equipment. According to the method, the metal pipe with large and stable linear expansion coefficient is adopted to manufacture the strain calibration device, and the position of an optical fiber is accurately controlled by curving a thread on the outer wall of the metal pipe. Due to the characteristic that the optical fiber on the metal pipe bears strain and temperature at the same time, and the loose optical fiber only bears temperature, the temperature and the strain are calibrated simultaneously. The constant-temperature equipment is used for applying accurate and controllable strain and temperature on the optical fiber and the loose optical fiber on the metal pipe, and calibration of the strain of the optical fiber and temperature coefficient is carried out by means of detailed calibration steps. By means of the strain and temperature high-accuracy simultaneous calibration device and the method of the optical fiber Brillouin sensor, the problems of high strain calibration error and low efficiency of strain and temperature calibration are resolved.

Description

technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing and measurement, in particular to a simultaneous calibration device and method for optical fiber strain and temperature based on Brillouin scattering. Background technique [0002] Distributed optical fiber Brillouin sensors have the advantages of distributed, long-distance, free from electromagnetic interference, and adaptable to harsh environments. This technology has attracted more and more attention from researchers and users because of its ability to measure strain and temperature at the same time. Gradually applied to construction, electric power, petroleum, aviation, security and other fields. In specific research and engineering practice, the optical fiber Brillouin sensing technology uses a single-mode fiber for ordinary communication as the sensing medium, and the strain information and temperature information along the fiber axis are related to the basic parame...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the strain calibration of the distributed optical fiber Brillouin sensor is caused by inconsistent ambient temperature, uneven strain application, and limited calibration length, which leads to large calibration errors, and low calibration efficiency due to the inability to perform strain and temperature calibration at the same time. Device and method for simultaneous calibration of optical fiber strain and temperature based on Brillouin scattering

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