High-temperature sensing method based on optical fiber micro Michelson interference on spherical end face

Abstract

The invention discloses a high-temperature sensing method based on optical fiber micro Michelson interference on a spherical end face. The conventional method has the defects of higher demodulation cost and the like. The method comprises the following steps of: determining a broadband light source, a three-port optical coupler, an optical spectrum analyzer and an optical fiber high-temperature sensing head with the spherical end face; connecting the devices according to a measurement scheme; and putting the optical fiber high-temperature sensing head with the spherical end face into an environment of which the temperature is needed to be measured, and measuring drifting of a wavelength corresponding to an interference peak value by using the optical spectrum analyzer to calculate the temperature. The high-temperature sensing method has the advantages of no electromagnetic interference, capability of realizing remote sensing, low cost, compact structure, large measurement range and thelike.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and relates to a high temperature sensing method based on micro-Michelson interference of optical fiber with a spherical end face. Background technique [0002] The Internet of Things has become the strategic focus of high-tech development in all countries in the world today, and it is an important milestone in the development of the human information society. Sensing technology, including optical fiber sensing technology, is one of the basic technologies for the development of the Internet of Things. The invention of optical fiber has brought a revolutionary impact on communication technology, and also brought about the rapid development of sensing technology, making it an indispensable part of the development of Internet of Things technology. Because the optical fiber can not only be used as the transmission medium of the light wave, but also when the light wave is transmitted in...

AI Technical Summary

Problems solved by technology

Fiber Bragg gratings will have a "bleaching effect" at high temperatures, and the refractive index modulation that maintains the characteristics of fiber Bragg gratings will disappear due to high temperatures. Therefore, the temperature sensing technology based on fiber Bragg gratings can only be applied to temperatures below 400 degrees Temperature sensing, and there are disadvantages such as high demodulation costs

Other types of fiber optic temperature sensors include fiber optic FP cavity temperature sensors, which generally require the use of special materials or special processing techniques, and the cost is relatively high

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