Calibration method and device for an optical fiber strain sensing system

Abstract

The invention provides a method for calibrating an optical fiber strain sensing system: suspend a heavy object platform on a stainless steel frame through a sensing optical fiber, and adjust the height of the vibrating table; place an electronic wave detector on the vibrating table; Vibration amplitude and frequency; according to the vibration amplitude and frequency, the first displacement of the vibrating table is obtained, and the speed of the vibrating table is measured by the electronic detector; the speed of the vibrating table is converted into the second displacement of the vibrating table; the vibration table is calculated The goodness of fit, thus completing the calibration of the optical fiber strain sensing system. The invention also provides a calibration device for the optical fiber strain sensing system. The invention enables the sensing optical fiber and the electronic wave detector to simultaneously measure the motion process of the vibrating table, and fits the motion information measured separately, and the deformation of the sensing optical fiber can be matched with the vibration amplitude of the vibrating table, thereby improving the performance of the optical fiber. The accuracy of the strain sensing system ensures the rationality and feasibility of the calibration method.

Description

Technical field [0001] The invention belongs to the technical field of optical fiber sensing, and particularly relates to a calibration method and device of an optical fiber strain sensing system. Background technique [0002] As the fiber optic strain sensing technology becomes more mature, and it has begun to replace electronic detectors in some applications, but whether the strain measured by the fiber optic sensing system is consistent with the actual strain, the vibration frequency range and vibration amplitude range that can be accurately measured How much is it? These questions need to be rigorously calibrated to determine the answer. At present, there is no effective calibration scheme, which can not only make the strain of the optical fiber accurately reflect the movement of the vibration table, but also make the electronic geophone correspond to the physical quantity measured by the optical fiber strain sensing system. Summary of the invention [0003] In view of the ab...

AI Technical Summary

Problems solved by technology

At present, there is no effective calibration scheme, which can not only make the strain of the optical fiber accurately reflect the movement of the shaking table, but also make the electronic detector correspond to the physical quantity measured by the optical fiber strain sensing system.

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