The noncontacting thermoelastic microscope is based on ~r + laser excitation and optical probe detection. The main problem is to adjust the experimental parameters for sensitivity optimisation. This paper points out that 3-D model predicts the sample thermoelastic behaviour. Calculated criteria enable the choice of the best values of parameters. Experimental results show the advantage of an imaging criterion : particularly contrast of metallic sample images is related to the relative position of excitation and detection beams.
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