Optothermal and photoacoustic spectroscopy is used for the study of optical properties of liquid and solid samples. The measured signal contains both a phase and an amplitude or equivalent: two components (x and y) with 90 degrees phase difference. The method is based on plotting the measured signal on the x,y plane. Different inversion formulae are presented and investigated by plots in the x,y plane. The formulae are used for the calculation of a linear relation between the measured signal and the optical absorption coefficient. If the thermal properties of the sample are known, an absolute measurement of the optical absorption coefficient can be made. The influence of bad thermal contact between sample and detector, thermally thin samples and light scattering samples are investigated by plots on the x,y plane.
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P. Helander (1993) studied this question.
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