Near-Infrared Diode Laser Based Spectroscopic Detection of Ammonia: A Comparative Study of Photoacoustic and Direct Optical Absorption Methods

A photoacoustic spectroscopic (PAS) and a direct optical absorption spectroscopic (OAS) gas sensor, both using continuous-wave room-temperature diode lasers operating at 1531.8 nm, were compared on the basis of ammonia detection. Excellent linear correlation between the detector signals of the two systems was found. Although the physical properties and the mode of operation of both sensors were significantly different, their performances were found to be remarkably similar, with a sub-ppm level minimum detectable concentration of ammonia and a fast response time in the range of a few minutes.

[1]  Z. Bozóki,et al.  Evaluation of a photoacoustic detector for water vapor measurements under simulated tropospheric/lower stratospheric conditions. , 2001, Environmental Science and Technology.

[2]  Zsolt Bor,et al.  A high-sensitivity, near-infrared tunable-diode-laser-based photoacoustic water-vapour-detection system for automated operation , 1999 .

[3]  P Hess,et al.  Effects of adsorption-desorption processes on the response time and accuracy of photoacoustic detection of ammonia. , 2001, Applied optics.

[4]  A. Kung,et al.  Photoacoustic Trace Detection of Methane Using Compact Solid-State Lasers† , 2000 .

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

[6]  A. Miklós,et al.  Application of acoustic resonators in photoacoustic trace gas analysis and metrology , 2001 .

[7]  G. Busca,et al.  Ammonia activation over catalysts for the selective catalytic reduction of NOx and the selective catalytic oxidation of NH3. An FT-IR study , 1996 .

[8]  András Miklós,et al.  Improved photoacoustic detector for monitoring polar molecules such as ammonia with a 1.53 μm DFB diode laser , 1999 .

[9]  Philip A. Martin,et al.  Tunable diode laser monitoring of atmospheric trace gas constituents , 1995 .

[10]  P. Kaspersen,et al.  Gas monitoring in the process industry using diode laser spectroscopy , 1998 .

[11]  M E Webber,et al.  Ammonia Monitoring Near 1.5 mum with Diode-Laser Absorption Sensors. , 2001, Applied optics.

[12]  V. Ebert,et al.  Sensitive detection of methane with a 1.65 μm diode laser by photoacoustic and absorption spectroscopy , 1998 .

[13]  A. Miklós,et al.  Optoacoustic trace-gas monitoring with near-infrared diode lasers. , 1994, Applied optics.

[14]  M. Sigrist.  Air monitoring by spectroscopic techniques , 1994 .

[15]  A. Rohrbacher,et al.  Inexpensive near-infrared diode-laser-based detection system for ammonia. , 1993, Applied optics.

[16]  D. Hanna.  Photoacoustic and Photothermal Phenomena , 1989 .

[17]  R. Rooth,et al.  Photoacoustic measurement of ammonia in the atmosphere: influence of water vapor and carbon dioxide. , 1990, Applied optics.

[18]  J B McManus,et al.  Astigmatic mirror multipass absorption cells for long-path-length spectroscopy. , 1995, Applied Optics.

[19]  D. Leleux,et al.  Ammonia Detection by use of Near-Infrared Diode-Laser-Based Overtone Spectroscopy. , 2001, Applied optics.