Distributed optical fiber strain sensing calibration system and method

Abstract

The invention provides a distributed optical fiber strain sensing calibration system and method. The system comprises a base, a sliding rail, a sliding block, a transmission base, a power device, an optical fiber fixing end, a displacement transmission device and a measuring device; an optical fiber or an optical cable is stretched by the optical fiber fixing end and the sliding block; the strainvalue of the distributed optical fiber sensing system is obtained by dividing the stretching variation of the optical fiber or the optical cable by a standard distance measurement. With the method adopted, the strain value is obtained more visually and accurately; the index accuracy of strain precision, sensitivity, measurement range and the like of delivery and installation construction of optical fiber strain sensors is improved, and an excellent engineering application effect is ensured.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a distributed optical fiber strain sensing calibration system and method. Background technique [0002] The mechanism of optical fiber sensing is to send the light beam incident from the light source into the sensing front end through the optical fiber, and interact with the external measured parameters in the sensing front end, so that the optical properties of the light in the sensing front end, such as light intensity, wavelength, frequency, etc. , phase, polarization state, etc. change to become a modulated optical signal, and then send it to an optoelectronic device through an optical fiber, and obtain the measured parameters after demodulation. [0003] Optical fiber sensing has many excellent properties, such as: anti-electromagnetic and atomic radiation interference performance, thin diameter, soft, light mechanical properties; insulation, non-inductiv...

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned technology can be used for temperature and strain calibration detection of distributed optical fibers, but this technology uses the thread written on the metal tube to precisely control the position of the optical fiber. The linear expansion coefficient is used to calibrate the strain and temperature of the optical fiber. It is difficult to control the micro-strain of the linear expansion, and the strain accuracy cannot be guaranteed; the metal tube used in this technology expands when heated, and the strain of the optical fiber on its surface is related to the temperature of the metal tube. , which is also related to the expansion of the metal tube, the decoupling accuracy of the two is limited

The calibration test of this technology for distributed optical fiber strain sensing cannot be realized: it is not conducive to the improvement of industrial mass production efficiency, and it is not suitable for distributed optical fiber transmission of different specifications and models and spatial resolutions, and sensing optical cables. Sensitive Calibration Test

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