Photoacoustic instruments calibration method

Tomasz Borowski; Tomasz Starecki

doi:10.1117/12.622323

6 October 2005 Photoacoustic instruments calibration method

Tomasz Borowski, Tomasz Starecki

Proceedings Volume 5948, Photonics Applications in Industry and Research IV; 59482B (2005) https://doi.org/10.1117/12.622323
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

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.

Citation Download Citation

Tomasz Borowski and Tomasz Starecki "Photoacoustic instruments calibration method", Proc. SPIE 5948, Photonics Applications in Industry and Research IV, 59482B (6 October 2005); https://doi.org/10.1117/12.622323

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KEYWORDS

Photoacoustic spectroscopy

Calibration

Acoustics

Transducers

Signal detection

Sensors

Light sources

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