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Abstract

A process, apparatus and heat microscope for testing the properties of materials by the photothermal effect includes generating a laser beam with a laser light source integrated into a portable measuring head, emitting the laser beam toward a region of a surface of a material sample to be tested, and focussing the laser beam to a desired measurement point diameter at a target light spot with optics at an end toward the laser beam, for absorbing a proportion of the amount of light energy with irradiated volume elements of the material sample and emitting infrared light signals from the surface of the volume elements and volume elements adjacent thereto. The emitted IR light signals are conducted to an optical decoupling element for conducting the emited IR light signals further and largely suppressing components of the laser beam reflected at the surface of the sample. Decoupled IR light signals are further conducted and focused onto receiving surface of at least one IR light detector inside the portable measuring head for converting received IR light signals into corresponding electrical signals for further signal processing. The laser beam is conducted from the laser light source to the optical element at the end of the laser beam with a first resulting degree of transmission and reflection of at least 60%, and the IR light signals emitted by the material sample are conducted to the at least one IR light detector with a second resulting degree of transmission and reflection of at least 60%.

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First Claim