摘要
光声技术探测火灾具有很大的优势,而光声腔的设计则是影响其测量结果最为关键的环节之一.文中介绍了非谐振式光声腔在火灾探测中的应用,低频调制波段有利于提高系统的检测信噪比,小的光声腔体积(约为72 cm3)则可以缩小整个探测系统的尺寸.测量了棉绳阴燃和酒精明火中CO气体浓度的变化,实验表明,此系统对CO气体浓度的检测灵敏度至少为3×10-6,表明非谐振式光声腔用于火灾探测是可行的.
The photoacoustic technology has great advantage in fire detection. Design of photoacoustic cell is a key factor affecting the measurement results. This paper introduces application of nonresonant photoacoustic cell in fire detection. The environmental disturbance has less influence on the measurement results due to low modulation frequency. Small photoacoustic cells （approx. 1 cm^3） can reduce the dimension of the whole detection system. Changes in carbon monoxide concentration in a smolding cotton fire and flaming spirits fire are measured. The results indicate that nonresonant photoacoustic cell has a better performance in fire detection.
出处
《应用科学学报》
CAS
CSCD
北大核心
2006年第6期623-626,共4页
Journal of Applied Sciences
基金
国家自然科学基金资助项目(50476023)
关键词
火灾探测
光声腔
非谐振
fire detection
photoacoustic cell
nonresonant
