光声光谱式甲烷气体传感器的研究  

Study on methane sensor based on photoacoustic spectrum

作　　者：付华[1] 翟波[1] 

机构地区：[1]辽宁工程技术大学电气与控制工程学院,辽宁葫芦岛125105

出　　处：《传感器与微系统》2010年第9期48-50,共3页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资助项目(50874059);辽宁省优秀人才基金资助项目(2007R24)

摘　　要：根据物体在周期性变化的光的照射下会产生声音信号的现象,提出了一种基于光声光谱理论的甲烷气体检测的方法。根据比尔—朗伯定律,经过调制的平行光束通过不同体积分数的甲烷气体时,其光强将会发生不同程度的衰减,若衰减后的光束进入光声腔,将会在光声腔内产生光声信号,通过测定光声信号的幅值来达到检测甲烷气体体积分数的目的。此方法相对于通常的光谱法,增加了把热能转换为声信号的过程,具有极高的精确性和可靠性,为设计高灵敏度瓦斯传感器的研究提供理论依据。According to the phenomenon that the objects will generate sound signal under the irradiation of periodic light, a detection method of methane gas based on photoaeoustic spectroscopy is proposed. According to Beer-Lambert law, when the modulated parallel beams is passing different volume fraction of methane gas, the light intensity will become attenuation in different degrees. If the decayed light go into a photoaeoustic cavity, photoacoustie signal will be generated in the cavity. By measuring the amplitude of photoaeoustie signal, the purpose of detecting the methane gas is achieved. Compared with usual spectral method,this method add a process that converting the heat energy into sound signal,which has high accuracy and reliability. It provide a theoretical basis for studying on high sensitive methane gas sensor.

关 键 词：光声光谱 甲烷 光声腔 光声信号 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]