Multi-state gas-liquid optical fiber sensor for simultaneous detection of pressure, temperature and component concentration

Abstract

The invention relates to a multi-state gas-liquid optical fiber sensor for detecting pressure, temperature and component concentration simultaneously. The sensor consists of a broadband light source, a spectrum analytical instrument, a return light guide optical fiber, a first light guide optical fiber, an optical fiber coupler, a second light guide optical fiber and a sensing optical fiber probe, wherein a temperature cavity for detecting the temperature of liquid or gas to be detected, a pressure cavity for detecting the pressure of the liquid or gas to be detected, and a component concentration cavity for detecting the component concentration of the liquid or gas to be detected are formed on the sensing optical fiber probe; fiber Bragg gratings with different reflection wavelengths arearranged in the temperature cavity and the pressure cavity; the temperature and pressure information of the liquid or gas to be detected is detected by detecting the change of the reflection wavelength of each fiber Bragg grating; an evanescent field sensing area is formed on an optical fiber section in the component concentration cavity; and the component concentration of the liquid or gas to bedetected is obtained by monitoring the attenuation degree of light intensity of a corresponding wavelength section in an optical fiber through the interaction of an evanescent field and the liquid orgas to be detected.

Description

technical field [0001] The invention belongs to the technical field of optical fiber biochemical sensors, and relates to the production of optical fiber sensors used in the fields of energy chemical industry, environmental monitoring and industrial production, and in particular to a sensor that can simultaneously detect the pressure, temperature and component concentration of measured liquids and gases multi-state gas-liquid fiber optic sensor. Background technique [0002] Real-time detection of parameters such as pressure, temperature, and component concentration of liquids and gases is of great significance in the fields of industrial production, environmental monitoring, and energy extraction. For example, in the process of natural gas transportation, it is necessary to monitor the pressure, temperature and component concentration of toxic gases such as H2S in real time; in the process of oil extraction, it is necessary to detect the temperature, pressure and component c...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems encountered in the multi-parameter measurement in the background technology, the purpose of the present invention is to provide a multi-state gas-liquid optical fiber sensor that can simultaneously detect the temperature, pressure and component concentration of the measured liquid and gas.

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