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Effective Normalization Method for Sample-Position-Dependence Effect in Photoacoustic Spectrometry

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Abstract:

Sample position dependence effect in photoacoustic (PA) spectrometry has been reported by several scientists. This effect must be taken into account in a PA application that requires a quantitative theoretical treatment. In this work, we experimentally investigated PA signal magnitude varying with sample-to-window distance in an MTEC Model 300 Photoacoustic Detector, which has a fixed empty (gas) volume in addition to the sample-to-window-distance-dependent gas volume. An operative method was introduced to obtain the coefficient, which considered the sample-to-window distance and the additional gas volume. With this coefficient, the one-dimensional PA model, developed by Aamodt, Murphy, and Parker, can be employed to quantitatively process PA experimental data, no matter what the sample-to-window distance is. Quantitative measurements of thermal effusivities of two samples were performed to prove this effective normalization method.

Keywords: ONE-DIMENSIONAL PHOTOACOUSTIC THEORY; PHOTOACOUSTIC CELL EFFECTS; PHOTOACOUSTIC SPECTROMETRY; SAMPLE POSITION DEPENDENCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370203321535105

Affiliations: Innovation Centre, National Research Council of Canada, 3250 East Mall, Vancouver, British Columbia, Canada V6T 1W5

Publication date: February 1, 2003

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