Multi-point measuring temperature sensor based on optical fiber radiation attenuation temperature property

Abstract

The invention discloses a multi-point measuring temperature sensor based on an optical fiber radiation attenuation temperature property. The multi-point measuring temperature sensor comprises an optical source, an optical splitter, N reference optical path channels, N measuring channels, a sensitive optical fiber sensing head, a double-channel optical power meter and a computer; an optical switch is embedded between each measuring channel and the optical power meter; the light switches can be controlled to be switched among the measuring channels so as to achieve the time division multiplexing of the sensor; and once the sensor is simplified to use, one reference light path channel is adopted to replace the N reference light path channels. According to the multi-point measuring temperature sensor, sensitive optical fiber sensing heads of the different measuring channels are positioned in different temperature environments, so that the distributive measurement on temperatures can be achieved, the temperature variation at a plurality of measuring points of a measured system can be monitored at the same time, and the temperature of each measuring point can be accurately distinguished.

Description

technical field [0001] The invention relates to a multi-point measuring temperature sensor based on optical fiber radiation-induced attenuation temperature characteristics, belonging to the technical field of optical fiber sensors. Background technique [0002] The distribution measurement of temperature field plays an important role in modern industrial systems and engineering applications. A typical distributed optical fiber temperature sensor can measure the temperature value of each point on the change of the optical fiber length in the form of a continuous function throughout the continuous optical fiber length. At present, the fiber Bragg grating (FBG) temperature sensor is one of the most widely used distributed temperature sensors. [0003] The fiber Bragg grating temperature sensor is carved in the optical fiber through precision technology, so that the refractive index in the optical fiber is periodically distributed to form a fiber Bragg grating (FBG). When the ...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing technical problems of the existing optical fiber temperature sensor, such as complicated manufacturing process, poor irradiation and measurement stability of the signal demodulation system, and to propose a multi-point sensor based on the temperature characteristics of optical fiber radiation-induced attenuation. Measuring temperature sensor

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