Cantilever-based photoacoustic detection of carbon dioxide using a fiber-amplified diode laser |
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| Authors: | T. Laurila H. Cattaneo T. Pöyhönen V. Koskinen J. Kauppinen R. Hernberg |
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| Affiliation: | (1) Institute of Physics, Optics Laboratory, Tampere University of Technology, P.O. Box 692, 33101 Tampere, Finland;(2) Department of Physics, Laboratory of Optics and Spectroscopy, University of Turku, 20014 Turku, Finland |
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| Abstract: | A compact and sensitive photoacoustic setup has been developed based on a recently demonstrated cantilever technique. A micromechanical cantilever transducer is attached to a cylindrical photoacoustic cell and the cantilever’s deflection is monitored with a compact Michelson interferometer. A commercial 1-Watt optical fiber amplifier was used to enhance the performance of the system. A normalized sensitivity of 1.4×10-10 cm-1 W Hz-1/2 was achieved in the detection of carbon dioxide at 1572 nm wavelength. Using 34 mW optical power from a DFB diode laser, the noise-equivalent detection limit for carbon dioxide at this wavelength is 4.0 ppm. Employing the fiber amplifier, we improved the sensitivity to yield measurement of sub-ppm concentrations. PACS 42.62.Fi; 42.55.Px; 82.80.Ch |
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