Fiber grating temperature sensing system for detecting temperatures of inflammables and explosives

Abstract

The invention provides a fiber grating temperature sensing system for detecting temperatures of inflammables and explosives. The system comprises an amplified spontaneous emission (ASE) broadband source, a circulator, an optical switch, an optical switch drive device, a fiber Bragg grating (FBG) temperature sensor, a holographic volume phase grating, a collimating lens, a condenser lens, a photoelectric detector, a control circuit, a digital signal processing (DSP) circuit, a storage and an upper computer, wherein the FBG temperature sensor is stuck onto the surfaces of the inflammables and explosives, and wavelength drifting information is demodulated by utilizing a holographic volume phase grating demodulation method, so that temperature variation of the FBG temperature sensor is obtained, namely, the temperature variation of the inflammables and explosives, and the temperature of the inflammable and explosive is finally obtained. Fiber grating temperature sensing system for detecting temperatures of inflammables and explosives has the advantages that the sensitivity and the stability are high, optical fiber sensors have strong anti-electromagnetic interference, anti-shaking, moisture resistant, corrosion resistant and the like competences, therefore the system can also be used normally for a long time in severe environments. The optical fiber sensors have the advantages of being light in weight, small in size and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber grating temperature sensing system used for temperature detection of inflammable and explosive articles. Background technique [0002] Sensor technology is one of the important technologies of modern measurement and automation systems. In the measurement of the temperature of flammable and explosive materials, because the general temperature sensor is weak in terms of electromagnetic interference, high corrosion, insulation and measurement range, it is imminent to develop a temperature sensor with strong anti-interference ability . [0003] Fiber Bragg Grating is a new type of optoelectronic device developed in the 1990s. After more than 10 years of development, the production technology of Fiber Bragg Grating is becoming more and more mature, and the system application is constantly expanding. Since the sensitive variable parameter of...

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Problems solved by technology

[0004] There are few patents on fiber gratings for measuring flammable and explosive temperatures. The existing Chinese patent ZL201020003923.X "Fiber Bragg grating fire alarm system combined with gas spectrum absorption box and temperature control The cavity parts need to move at high speed, so the service life is limited, and although multiple channels are scanned at the same time, the data of one band cannot be obtained at the same time; Chinese patent ZL201020695728. The fiber grating temperature sensor with the same emission wavelength can monitor the temperature change through tunable filter filtering and scanning, but its structure is complex, the sensitivity is not high, and the shock resistance is not good; the Chinese patent ZL200520034822.8 "fiber grating temperature sensing alarm device" Comparing the grating with the reference grating, the temperature alarm information is given, but the monitoring accuracy is also not high, and the shock resistance is not good

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