A forced airflow type open air chamber

Abstract

The invention discloses a forced air flow open type air chamber for gas concentration detection, which is composed of an air inlet unit, an air outlet unit and a sealed connection channel. The installation seat required for installing the detector is installed on the upper body, and the temperature sensor and pressure sensor are installed on the connecting pipe. The gas chamber can be divided into straight-through type and bent type straight-through type. There is no "dead gas" phenomenon in concentration detection. The gas flow path coincides with the detection optical path, the light energy utilization rate is high, and there is no round-trip reflection in the optical path, which effectively avoids light interference and reduces optical noise. The gas chamber has simple structure, high light energy utilization rate, simple debugging, convenient installation and low cost, and is especially suitable for dynamic detection of gas concentration in early fire warning systems of buildings.

Description

technical field [0001] The invention belongs to the technical field of building fire early monitoring and early warning, and relates to a gas chamber used for dynamic detection of fire characteristic gas concentration in a building early fire early warning system. Background technique [0002] With the development of science and technology, especially the development and progress of diode laser absorption spectroscopy technology, theoretically, diode laser absorption spectroscopy technology can be used to detect trace amounts of harmful gases produced in the early stages of fire formation, and it has high sensitivity and high spectral resolution. , fast response, good gas selectivity and intrinsic safety, not only the detection results are more accurate, more reliable and faster, but also the fire warning time is significantly advanced, which wins precious time for fire fighting and fire fighting in the early stage of fire formation , to minimize casualties and property dama...

AI Technical Summary

Problems solved by technology

[0005] However, the common problem of these air chambers is that the number of light reflections is many, as few as ten times (the length of the air chamber is 1m), as many as tens of times, or even hundreds of times

The increase in the number of reflections has adverse effects. First, the more the number of reflections, the greater the loss of light energy, and the lower the utilization rate of light energy; the second is that the light is reflected back and forth between the mirrors, which is good for lasers with excellent monochromaticity. It is easy to produce interference fringes, and these interference fringes form optical noise on the detector, which reduces the signal-to-noise ratio of the detector signal; third, it is difficult to adjust the optical path, it is difficult to install on site, and the long-term stability needs to be verified

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