Tuning fork enhanced interferometric photoacoustic spectroscopy: a new method for trace gas analysis |
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Authors: | M Köhring A Pohlkötter U Willer M Angelmahr W Schade |
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Institution: | 1.Fraunhofer Heinrich Hertz Institute,Goslar,Germany;2.MIOPAS GmbH,Goslar,Germany;3.Institute for Energy Research and Physical Technology,Clausthal University of Technology,Goslar,Germany |
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Abstract: | A photoacoustic trace gas sensor based on an optical read-out method of a quartz tuning fork is shown. Instead of conventional
piezoelectric signal read-out, as applied in well-known quartz-enhanced photoacoustic spectroscopy (QEPAS), an interferometric
read-out method for measurement of the tuning fork’s oscillation is presented. To demonstrate the potential of the optical
read-out of tuning forks in photoacoustics, a comparison between the performances of a sensor with interferometric read-out
and conventional QEPAS with piezoelectric read-out is reported. The two sensors show similar characteristics. The detection
limit (L) for the optical read-out is determined to be L
opt=(2598±84) ppm (1σ) compared to L
elec=(2579±78) ppm (1σ) for piezoelectric read-out. In both cases the detection limit is defined by the thermal noise of the tuning fork. |
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