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

A spherical end, optical fiber technology, applied in the field of high temperature sensing based on spherical end face optical fiber micro-Maxson interference, can solve the problems of high cost and high demodulation cost, and achieve the effect of compact structure, large measurement range and no electromagnetic interference.

Inactive Publication Date: 2013-05-01
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
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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

Method used

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

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Embodiment Construction

[0018] Such as figure 1 and figure 2 As shown, the device used in the present invention includes a broadband light source 1, an optical coupler 2, a spectrum analyzer 3, and an optical fiber high temperature sensing head 4 with a spherical end face.

[0019] The output port of broadband light source 1 is connected with the first port optical fiber of optical coupler 2; The input port of spectrum analyzer 3 is connected with the second port optical fiber of optical coupler 2; The third port of optical coupler 2 is connected with a The optical fiber high-temperature sensing head 4 with a spherical end face is connected to an optical fiber; the components that form the optical fiber high-temperature sensing head 4 with a spherical end face include a section of single-mode optical fiber 5 and a section of hollow-core photonic crystal fiber 6, and the manufacturing steps are as follows: the single-mode optical fiber 5 The output port and the input port of the hollow-core photonic...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/00
Inventor 陈达如王飞舟吴根柱彭保进
Owner ZHEJIANG NORMAL UNIVERSITY
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