Distributed type optical fiber Raman photon temperature sensing fire disaster detector

A technology of distributed optical fiber and fire detectors, which is applied to fire alarms, instruments, thermometers, etc. that act on electricity, can solve problems such as low isolation, weak Raman scattering of optical fibers, and poor reliability, and achieve long life and improve signal quality. Noise ratio, cost reduction effect

Inactive Publication Date: 2009-03-25
山西关铝集团有限公司
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Problems solved by technology

[0004] The Raman scattering of optical fiber is very weak. The existing foreign mid-range distributed optical fiber Raman photon temperature sensor adopts discrete wavelength division multiplexer sys

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  • Distributed type optical fiber Raman photon temperature sensing fire disaster detector
  • Distributed type optical fiber Raman photon temperature sensing fire disaster detector
  • Distributed type optical fiber Raman photon temperature sensing fire disaster detector

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Embodiment Construction

[0020] refer to figure 1 , the distributed optical fiber Raman photon temperature-sensitive fire detector includes an optical pulse laser 10, an integrated optical fiber wavelength division multiplexer 11, an intrinsic temperature-sensitive optical fiber 12, two photoelectric avalanche diodes 13, 14, and a digital signal processor 15 With display or alarm 16, the integrated optical fiber wavelength division multiplexer 11 has four ports, wherein the 1550nm port is connected with the optical pulse laser 10, the common port is connected with the intrinsic temperature-sensitive optical fiber 12, and the 1450nm port is connected with the first photoelectric The avalanche diode 13 is connected, and the 1660nm port is connected with the second photo avalanche diode 14, and the other end of the first photo avalanche diode n-tube 13 and the other end of the second photo avalanche diode 14 are connected with the digital signal processor 15 respectively, and the digital signal processing...

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Abstract

The invention discloses a distributed optical fiber Raman photon temperature sensing fire detector. The detector is a fire detector produced on the basis of integrated optical fiber wavelength division multiplex technology by utilizing the principle that the strength of the optical fiber anti-Stokes Raman photon is modified by the temperature of the optical fiber and the principle of optical time domain reflection. The fire detector comprises a light pulse laser device, an integrated optical fiber wavelength division multiplexer, intrinsic temperature sensing optical fiber, two avalanche photodiodes, a digital signal processor and a display or an alarm. The intrinsic temperature sensing optical fiber laid in the fireproof site is uncharged, electromagnetic interference resistant, radiation resistant and corrosion resistant, and is both a transmission media and a sensing media. The fire detector has the advantages of low cost, long service life, simple structure, good signal-to-noise ratio and good reliability, thereby being suitable for medium range and short range temperature sensing and fire detection within 100 meters-15 kilometers.

Description

technical field [0001] The invention relates to a fire monitor, in particular to a distributed optical fiber Raman photon temperature-sensitive fire detector. Background technique [0002] For a long time, in the field of fire protection technology and engineering at home and abroad, linear temperature-sensing cables are mainly used as linear temperature-sensing fire detectors. The temperature-sensing cable is a two-core cable designed with the "on / off" principle. When the built-in two-core wire is heated and dissolved at the preset temperature, a short circuit will be formed and an alarm will be issued. Temperature-sensing cables are relatively cheap, but they cannot be located, nor can they predict the temperature change process at the disaster prevention site. [0003] Developed in recent years, the use of distributed optical fiber temperature sensors and quasi-distributed optical fiber temperature sensors (mainly fiber grating type and optical fiber Fab type) is used as...

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Application Information

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IPC IPC(8): G08B17/06G01K11/32G01K11/324
Inventor 张在宣张淑琴
Owner 山西关铝集团有限公司
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