Photoacoustic Resonant Cell remodified from Helmholtz Cavity for Multi-gas Sensing Using Infrared Lasers
This paper presents method and performance of the photoacoustic resonant cell remodified from Helmholtz cavity that can be used to detect photoacoustic signal of multi-gas.This technique has its physical basis in a phenomenon called the photoacoustic effect.The experiment system is composed of a resonant Helmholtz cavity,a sensitive microphone and two infrared lasers with high adsorption capability and specificity to the analyte.In our experiments,the average optical power at the laser operating point is 200mW for the 972nm laser (H2O detection) and 800mW for the10.653um laser (CO2 detection),which are modulated at two different frequencies f1=175Hz and f2=125Hz.The remodified Helmholtz resonant on-line and real time measurement of the water vapour (300ppm) and carbodioxide (300ppm) conducted at their respective resonant frequency shown large signals about 4.41mV and 19.77mV respectively.The result demonstrated this cell used to test multi-gas is also feasible.
Multi-gas Sensing, Photoacoustic, Helmholtz Cavity
J.J.Zhao X.H.Li Z.Zhao X.L.Gai Y.Q.Liu
Municipal Key Laboratory of Environmental noise and vibration, BeijingMunicipal Institute of Labour Municipal Key Laboratory of Environmental noise and vibration, Beijing Municipal Institute of Labour State Key Laboratory of Transducer Technology, Institute of Electronics,Chinese Academy of Sciences,
国际会议
中国微米纳米技术学会第14届学术年会、第3届国际年会暨第6届微米纳米技术“创新与产业化国际研讨与展览会(CSMNT2012 & ICMAN2012)
杭州
英文
1-6
2012-11-04（万方平台首次上网日期，不代表论文的发表时间）