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Fourier Transform Infrared Measurement of Solid-, Liquid-, and Gas-Phase Samples with a Single Photoacoustic Cell

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Abstract:

A photoacoustic detector based on the optical cantilever microphone has been built. The detector is capable of measuring solid-, liquid-, and gas-phase samples. Photoacoustic Fourier transform infrared (FT-IR) measurement with three samples in different phases was demonstrated. Example samples were polyethene, sunflower oil, and methane. The sensitivity of the cell was compared to a commercial photoacoustic FT-IR detector. With the standard carbon black sample the cantilever detector gave approximately five times higher signal-to-noise ratio than the reference detector. The sensitivity with methane was also compared to the DTGS detector of the FT-IR instrument corresponding to an absorption path of 6.3 cm. Simulation of the photoacoustic signal showed that a compromise has to be made in the cell design between sensitivity for solid- and gas-phase samples but it is possible to highly enhance the sensitivity for all types of samples by reducing cantilever dimensions.

Keywords: CANTILEVER MICROPHONE; FOURIER TRANSFORM INFRARED SPECTROSCOPY; FT-IR SPECTROSCOPY; PAS; PHOTOACOUSTIC SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370208784658048

Affiliations: 1: Laboratory of Optics and Spectroscopy, Department of Physics, FI-20014 University of Turku, Finland; Gasera Ltd., Tykistökatu 4, FI-20520 Turku, Finland 2: Laboratory of Optics and Spectroscopy, Department of Physics, FI-20014 University of Turku, Finland

Publication date: June 1, 2008

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