title: Detection of molecular oxygen at low concentrations using quartz enhanced photoacoustic spectroscopy.
abstract: Molecular oxygen is detected at low concentrations using photoacoustic spectroscopy despite its unfavorable photoacoustic properties. The system consists of a seed laser diode, a tapered amplifier and a quartz tuning fork based spectrophone, thus employing quartz enhanced photoacoustic spectroscopy (QEPAS). With this system a detection limit of 13 ppm is reached with a compact and long term stable setup. Further improvement of the detection limit is possible by adding suitable gases to the sample gas that promote the radiationless de-excitation of the oxygen molecules.
authors.affiliation: Clausthal University of Technology, Institute for Energy Research and Physical Technology, Energy-Campus, Am Stollen 19, 38640 Goslar, Germany. a.pohlkoetter@pe.tu-clausthal.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Pohlkötter
authors.forename: Michael
authors.initials: M
authors.lastname: Köhring
authors.forename: Ulrike
authors.initials: U
authors.lastname: Willer
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schade
mesh_terms: D000388:Air / Q000032:analysis; D002138:Calibration; D003198:Computer Simulation; D057230:Limit of Detection; D010100:Oxygen / Q000032:analysis*; D061088:Photoacoustic Techniques / Q000295:instrumentation / Q000379:methods*; D011791:Quartz / Q000737:chemistry*; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods*
chemical_list: D011791:Quartz; D010100:Oxygen