Infrared-laser photoacoustic spectroscopy |
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| Affiliation: | 1. Centre for Acoustic-Mechanical Micro Systems, Technical University of Denmark, Ørsteds Plads, Building 352, DK-2800, Kgs. Lyngby, Denmark;2. Department of Electrical Engineering, Denmark;3. Department of Mechanical Engineering, Denmark;1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, 92# Wucheng Road, Taiyuan 030006, China;2. Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA;1. Sensorik-Applikationszentrum (SappZ) der Ostbayerischen Technischen Hochschule (OTH) Regensburg, 93053 Regensburg, Germany;2. Institut für Analytische Chemie, Chemo- und Biosensorik, Universität Regensburg, 93053 Regensburg, Germany;1. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China;2. Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX 77005, USA;1. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China;2. Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, PR China |
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| Abstract: | This paper reviews the applications of IR-laser photoacoustics to trace-gas monitoring as well as to spectroscopic studies on absorbing liquids.In the first part we present a stationary, dual-beam CO-laser and a mobile CO2-laser photoacoustic system which have both been applied to the monitoring of various gaseous pollutants. Emphasis is put on selectivity, sensitivity and on temporal resolution. Novel cell designs and experimental techniques and an iterative procedure for the analysis of photoacoustic spectra of multicomponent mixtures are introduced. New results are presented for measurements on car and industrial exhausts as well as on ambient air.The second part is devoted to theoretical and experimental photoacoustic studies on strongly absorbing liquids, in particular on the investigation of different boundary conditions. A characteristic enhancement of the photoacoustic signal in the liquid is obtained if a liquid or solid surface layer is present. This new phenomenon permits the analysis of surface films with a thickness of ⩾ 1 μm. Furthermore, the photoacoustic in-situ monitoring of the polymerization process on a liquid surface is presented for the first time. |
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