Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Fire detection technique based on photoacoustic principle
A fire detection system based on photoacoustic (PA) principle is reported. The system operates by selecting gas generated in combustion instead of conventional smoke and temperature as parameter, so it can realize an early fire detection. It consists of a broad-spectrum infrared source ranging from 2 to 5 m, a absorption path, a photoacoustic cell, a lock-in amplifier and a sensitive microphone as photoacoustic signal receiver. The reference cell filling with the high-purity gas (here is carbon monoxide) is used as a gas filter selector. The change of gas concentration to be measured in the air is converted into electrical signal and superposed on the initial signal. The gas concentration in the air can be calculated by a simple algorithm according to the relationship between changed photoacoustic signal and gas concentration. Two kinds of Chinese standard fires are tested by the PA detection system. The measurement results show that the system reacts very well to both fires. And a detection limit of 3 ppm of carbon monoxide is achieved experimentally.
Fire detection technique based on photoacoustic principle
A fire detection system based on photoacoustic (PA) principle is reported. The system operates by selecting gas generated in combustion instead of conventional smoke and temperature as parameter, so it can realize an early fire detection. It consists of a broad-spectrum infrared source ranging from 2 to 5 m, a absorption path, a photoacoustic cell, a lock-in amplifier and a sensitive microphone as photoacoustic signal receiver. The reference cell filling with the high-purity gas (here is carbon monoxide) is used as a gas filter selector. The change of gas concentration to be measured in the air is converted into electrical signal and superposed on the initial signal. The gas concentration in the air can be calculated by a simple algorithm according to the relationship between changed photoacoustic signal and gas concentration. Two kinds of Chinese standard fires are tested by the PA detection system. The measurement results show that the system reacts very well to both fires. And a detection limit of 3 ppm of carbon monoxide is achieved experimentally.
Fire detection technique based on photoacoustic principle
Feuererkennungstechnik auf Basis des photoakustischen Prinzips
Jiang, Yalong (Autor:in) / Chen, Tao (Autor:in) / Yuan, Hongyong (Autor:in) / Zhang, Yongming (Autor:in) / Zhu, Yuquan (Autor:in) / Wang, Jinjun (Autor:in) / Ma, Suihua (Autor:in)
2006
4 Seiten, 4 Bilder, 16 Quellen
Aufsatz (Konferenz)
Englisch
Fire Detection Technique Based on Photoacoustic Principle
| British Library Conference Proceedings | 2006
Photoacoustic gas detection for fire warning
| British Library Online Contents | 2002
Photoacoustic gas detection for fire warning
| British Library Online Contents | 2001
Thermal Properties Measurement Photoacoustic Technique for Hardmetals
| British Library Online Contents | 2006
Integrate photoacoustic method and soot scattering theory to detect fire
| Tema Archiv | 2006