System and method for simultaneously monitoring multiple components of building fire early-stage characteristic gases

A characteristic gas and monitoring system technology, applied in the direction of color/spectral characteristic measurement, etc., can solve problems such as low smoke volume fraction, difficult alarm, low heat release rate, etc., to overcome slow response speed, reduce system cost, high Effect of Detection Sensitivity

Inactive Publication Date: 2013-11-27
ANHUI UNIVERSITY OF ARCHITECTURE
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Problems solved by technology

At this stage, the heat release rate is relatively low, the ambient temperature basically does not change, and the smoke volume fraction is not

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  • System and method for simultaneously monitoring multiple components of building fire early-stage characteristic gases
  • System and method for simultaneously monitoring multiple components of building fire early-stage characteristic gases
  • System and method for simultaneously monitoring multiple components of building fire early-stage characteristic gases

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[0024] Such as figure 1 , 2 , 3, a multi-component simultaneous monitoring system and method for the early characteristic gas of a building fire, using a near-infrared DFB semiconductor laser 6 with a central wavelength of 1570nm as CO, CO 2 The detection laser light source, the 1570 nm semiconductor laser temperature and current control module 3 tunes the laser output center wavelength to the center wavelength by controlling the laser temperature and current, and the frequency generated by the signal generation circuit 4 is f 0 The sawtooth wave signal of the laser is superimposed on the driving current of the laser, so that the laser wavelength slowly scans through CO, CO 2 The absorption line of the gas, the signal generating circuit 4 simultaneously generates a frequency f 1 The sine wave signal is superimposed on the driving current of the laser to modulate the laser output wavelength, and the near-infrared DFB semiconductor laser 7 with a center wavelength of 1529nm is...

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Abstract

The invention discloses a system and a method for simultaneously monitoring multiple components of building fire early-stage characteristic gases. Characteristic gases (CO, CO2, C2H2 and HCN) released in a fire early-stage pre-combustion stage are simultaneously detected by adopting a tunable semiconductor laser absorption spectrum-based modulation frequency multiplexing technique; the influence on a measuring result caused by light intensity fluctuation due to gas disturbance in a laser light source and a light path is eliminated by adopting a self-balancing detection technique, and high detection sensitivity is obtained by combining a wavelength modulation technique, and multiple components of the building fire early-stage characteristic gases are simultaneously detected by using a multi-wavelength, self-balancing detection and frequency division multiplexing-based signal detection technique.

Description

technical field [0001] The invention belongs to a laser spectrum measurement method for simultaneous measurement of multiple gases, in particular to a multi-component simultaneous monitoring system and method for early characteristic gases of building fires, which can simultaneously measure four early fire characteristic gases CO, CO2, C 2 h 2 and HCN concentrations. Background technique [0002] Fire is sudden and destructive, and once it happens, the consequences will be quite serious. It is one of the most frequent and destructive disasters, its direct loss is about five times that of earthquakes, second only to drought and flood disasters, and its occurrence frequency ranks first among all disasters. As for the loss caused by fire, the United States doubles in less than 7 years on average, Japan doubles in 16 years on average, and China doubles in 12 years on average. In recent years, about 40,000 fires have occurred in my country every year, and the direct economic l...

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Application Information

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IPC IPC(8): G01N21/39
Inventor 王敏朱达荣王雅姬敬朱广
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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