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Proceedings Paper

Photoacoustic instruments calibration method
Author(s): Tomasz Borowski; Tomasz Starecki
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Paper Abstract

Some aspects of calibration of photoacoustic instruments are discussed in this paper. In most reports concerning photoacoustic experiments, measurement results are given in arbitrary units. Traditional calibration methods of photoacoustic cells are based on measurements of known concentration of a reference substance. However, from the point of view of such calibration methods, instruments of identical sensitivity but with different internal volumes will produce different responses if the same amount of investigated specimen is used in both cases. This may create problems in measurements when the amount of investigated specimen is limited. The paper presents a method that can be used to improve calibration of photoacoustic cells and associated electronics. The method uses acoustical pressure produced by a piezoelectric disc mounted in the cell and driven from an external oscillator circuit, so that it is possible to compare the amount of sound energy with the amplitude of the electric signal at the sound detector output. In such a way it is possible to evaluate energetic efficiency of the cell and the associated electronic circuit, to determine overall sensitivity of the setup, its signal to noise ratio, etc.

Paper Details

Date Published: 6 October 2005
PDF: 8 pages
Proc. SPIE 5948, Photonics Applications in Industry and Research IV, 59482B (6 October 2005); doi: 10.1117/12.622323
Show Author Affiliations
Tomasz Borowski, Independent Researcher (Poland)
Tomasz Starecki, Warsaw Univ. of Technology (Poland)


Published in SPIE Proceedings Vol. 5948:
Photonics Applications in Industry and Research IV
Ryszard S. Romaniuk; Stefan Simrock; Vladimir M. Lutkovski, Editor(s)

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