An optical fiber temperature sensing device

Abstract

The invention discloses an optical fiber temperature sensing device, which comprises a photoelectric modulation unit, a beam splitting unit, a first branch, a second branch and a combining unit. The beam unit constitutes the first oscillating circuit, the first oscillating circuit is used to realize the oscillation of the first microwave signal, the second oscillating circuit is composed of the photoelectric modulation unit, the beam splitting unit, the second branch and the beam combining unit, In order to realize the oscillation of the second microwave signal, the resonant wave is obtained by superimposing the first microwave signal and the second microwave signal. When the temperature signal is loaded into the sensing area of ​​the second optical fiber, the oscillation peak of the resonant wave drifts. Obtaining the intensity variation of the resonant wave at a fixed frequency can realize the demodulation of the temperature signal. The device provided by the invention has high sensitivity, strong anti-interference ability, small phase noise, wide measurement range and simple demodulation, and can be used for optical fiber communication.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to an optical fiber temperature sensing. technical background [0002] The development of optical fiber sensing technology began in the 1970s, and it is one of the most active branches of optoelectronic technology. Because the optical fiber has many characteristics such as high sensitivity, anti-electromagnetic interference, small size, and easy formation of arrays. Therefore, the optical fiber sensing technology has received great attention since it came out, and has been researched and applied in almost every field. It has become the forerunner of sensing technology and promoted the vigorous development of sensing technology. [0003] Compared with traditional sensors, the use of optical fibers for sensing has many advantages: optical fibers are small in size and light in weight, and are easy to embed in the structure to be tested; they have good ins...

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Problems solved by technology

[0005] In view of the above defects, the object of the present invention is to provide an optical fiber temperature sensing device, which aims to solve the technical problem that the optical fiber sensor cannot take into account high sensitivity, anti-interference and simple demodulation method due to the structure of the optical fiber sensor in the prior art

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