Optical fiber random laser high-temperature sensor

Abstract

The invention discloses an optical fiber random laser high-temperature sensor, and belongs to the technical field of optical fiber sensing. The sensor comprises a pumping source, a wavelength division multiplexer, a gain optical fiber, a random fiber grating, an optical circulator, an optical fiber isolator, a tube furnace and a spectrograph, the two ends of the wavelength division multiplexer are connected with the pumping source and the gain optical fiber respectively, one end of the gain optical fiber is connected to the optical circulator, and the output end of the optical circulator is sequentially connected with the random fiber grating, the optical fiber isolator, the spectrograph and the random fiber bragg gratings are arranged in the tube furnace; pump light is coupled through the wavelength division multiplexer and enters the gain optical fiber to be amplified, and the optical circulator couples the amplified laser into the random fiber bragg grating. The wavelength of the random fiber bragg grating is changed by adjusting the temperature of the tube furnace, and the spectrograph records the spectrum of the output laser to realize temperature sensing. The sensor can obtain an extremely low threshold value and an ultrahigh optical signal-to-noise ratio, can perform sensing at a relatively high temperature, and has a great prospect in the aspects of high-temperature monitoring and measurement and the like which are actually required.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and more specifically relates to an optical fiber random laser high temperature sensor. Background technique [0002] In recent years, with the continuous research on fiber random lasers, various applications have matured accordingly. The research on random fiber gratings, the key device in random fiber lasers, has also received extensive attention. Sensors based on fiber random lasers have also gained a lot of attention. The rapid development has greatly enriched the research and application fields of fiber random lasers. [0003] Fiber random lasers have the advantages of simple structure, small size, light weight, anti-interference, corrosion resistance, and high sensitivity. It has become a research hotspot at home and abroad, and has broad application prospects in aerospace, food processing, environmental monitoring, metal smelting, fire monitoring and other industries. In re...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a fiber optic random laser high temperature sensor, thereby solving the technical problem of high threshold value of the random laser high temperature sensor in the prior art

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