Thermal diffusivity measurement in thin metallic filaments using the mirage method with multiple probe beams and a digital camera

The Review of Scientific Instruments
E VargasE Marín

Abstract

Photothermal beam deflection is a well-established technique for measuring thermal diffusivity. In this technique, a pump laser beam generates temperature variations on the surface of the sample to be studied. These variations transfer heat to the surrounding medium, which may be air or any other fluid. The medium in turn experiences a change in the refractive index, which will be proportional to the temperature field on the sample surface when the distance to this surface is small. A probe laser beam will suffer a deflection due to the refractive index periodical changes, which is usually monitored by means of a quadrant photodetector or a similar device aided by lock-in amplification. A linear relationship that arises in this technique is that given by the phase lag of the thermal wave as a function of the distance to a punctual heat source when unidimensional heat diffusion can be guaranteed. This relationship is useful in the calculation of the sample's thermal diffusivity, which can be obtained straightforwardly by the so-called slope method, if the pump beam modulation frequency is well-known. The measurement procedure requires the experimenter to displace the probe beam at a given distance from the heat source, measure t...Continue Reading

References

Aug 7, 2009·The Review of Scientific Instruments·Arantza MendiorozAgustín Salazar
Apr 15, 1981·Applied Optics·W B JacksonD Fournier
Nov 5, 2013·The Review of Scientific Instruments·E MarínA Calderón

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