Large-scale multiple optical fiber strain sensing system integrated calibration device and method

Abstract

The invention relates to a large-scale integrated calibration device for various optical fiber strain sensing systems. The large-scale integrated calibration device for various optical fiber strain sensing systems is used for calibrating strain coefficients of a BOTDA (Brilouin Optical Time Domain Analyzer), a BOTDR (Brillouin Optical Time Domain Reflectometer) and a FBG (fiber bragg grating) demodulation instrument, comprises a tested BOTDA, a tested BOTDA, a tested FBG demodulation instrument, a statical strain indicator, a large-scale triangle cantilever beam, an optical fiber, an optical fiber in which a FBG is written, a FBG, a strain gauge and an optical fiber and has the acting length of over 1,200mm and the accuracy of 1mu epsilon. Compared with the prior art, the large-scale integrated calibration device for various optical fiber strain sensing systems has the advantages of long acting length, high accuracy and low cost.

Description

technical field [0001] The invention relates to a calibration device, in particular to an integrated calibration device for large-scale multiple optical fiber strain sensing systems. Background technique [0002] Optical fiber strain sensors are not affected by electromagnetic effects, can work in harsh environments for a long time, are intrinsically safe, and have high sensitivity. There are more and more engineering applications. Among them, strain sensing systems based on BOTDR and BOTDA and strain The sensing system is the most researched and used optical fiber strain sensing system. In the application process, strain calibration must be performed on BOTDR, BOTDA and fiber grating demodulator. The current calibration method is mainly the universal testing machine method, which uses Hydraulic stress is applied to make the optical fiber strain, with high precision and easy traceability, but the price is expensive, generally more than 100,000, and the working length is shor...

AI Technical Summary

Problems solved by technology

[0002] Optical fiber strain sensors are not affected by electromagnetic effects, can work in harsh environments for a long time, are intrinsically safe, and have high sensitivity. There are more and more engineering applications. Among them, strain sensing systems based on BOTDR and BOTDA and strain The sensing system is the most researched and used optical fiber strain sensing system. In the application process, strain calibration must be performed on BOTDR, BOTDA and fiber grating demodulator. The current calibration method is mainly the universal testing machine method, which uses Hydraulic stress is applied to make the optical fiber strain, with high precision and easy traceability, but the price is expensive, generally more than 100,000, and the working length is short, generally less than 700mm, which cannot meet the needs of optical fiber strain sensing equipment such as BOTDR and BOTDA. Large range calibration requirements for

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