A photocoustic spectroscopy system for gas detection based on the multi-pass cell

Photo-acoustic spectroscopy gas detection technology has the advantages of high sensitivity, good selectivity, small size and real time monitoring and has been widely used in environmental monitoring, industrial production, medical diagnosis, biological technology and monitoring of power facilities. In this paper, a method to improve the sensitivity of photo-acoustic spectroscopy system is presented, which is combined with the technique of Herriott type multiple pass cell. In this experimental apparatus, the design of the experimental device can make the beam pass the cell 18 times. By comparing the signal of one time pass through the photoacoustic cell and the signal of 18 times passes pass through the photoacoustic cell, we can confirm that the signal is increased and this method is feasible.

[1]  N D Kenyon,et al.  Air Pollution: Sensitive Detection of Ten Pollutant Gases by Carbon Monoxide and Carbon Dioxide Lasers , 1972, Science.

[2]  ByoungChul Ko,et al.  Early fire detection algorithm based on irregular patterns of flames and hierarchical Bayesian Networks , 2010 .

[3]  Markus W. Sigrist,et al.  Mobile laser spectrometer with novel resonant multipass photoacoustic cell for trace-gas sensing , 2000 .

[4]  Ding Yipeng,et al.  Gas measurement system of NO and NO2 based on photoacoustic spectroscopy , 2013 .

[5]  Zoltán Bozóki,et al.  Ammonia monitoring at ppb level using photoacoustic spectroscopy for environmental application , 2008 .

[6]  Alexander Graham Bell,et al.  Upon the production and reproduction of sound by light , 1880 .

[7]  L. Kreuzer,et al.  Ultralow Gas Concentration Infrared Absorption Spectroscopy , 1971 .

[8]  F. Harren,et al.  Geometrical optimization of a longitudinal resonant photoacoustic cell for sensitive and fast trace gas detection , 1996 .

[9]  J. Atwood,et al.  The laser illuminated absorptivity spectrophone: a method for measurement of weak absorptivity in gases at laser wavelengths. , 1968, Applied optics.

[10]  Dongil Han,et al.  Flame and smoke detection method for early real-time detection of a tunnel fire , 2009 .

[11]  M. Larsen,et al.  Human leukocyte antigen-G polymorphism in relation to expression, function, and disease. , 2009, Human immunology.

[12]  William R. Harshbarger,et al.  Opto-acoustic effect. Revival of an old technique for molecular spectroscopy , 1973 .

[13]  Frank K. Tittel,et al.  Real time ammonia detection in exhaled human breath using a distributed feedback quantum cascade laser based sensor , 2011, OPTO.