Method and system for measuring the thermal diffusivity

Details Method and system for measuring the thermal diffusivity Method and system for measuring the thermal diffusivity

2008-04-29

2008-04-29

Verbitsky, Gail (Department: 2859)

Thermal measuring and testing

Determination of inherent thermal property

Reexamination Certificate

active

10535073

ABSTRACT:
The present invention concerns a method and a system for measuring the thermal diffusivity. Said method comprises the steps of: subjecting a surface region of an object to a modulated heating beam (3) while providing a signal (MLS) thereof, the heated spot or area (4) of the surface of the sample (2) having a definitive diameter and a fixed intensity distribution profile; providing a signal (MTS) proportional to the temperature of the heated spot area (4); determining the phase difference between the modulated beam signal (MLS) and the resulting modulated temperature signal (MTS); and using said determined phase difference and the associated frequency to work out the thermal diffusivity value of said object (2).

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Thomas S. et al: “Thermal Diffusivity of Solids by Photoacoustic Cell Rotation and Phase Lag Measurement”; Review of Scientific Instruments, American Institute of Physics. New York, US, vol. 66, No. 7, Jul. 1, 1995, pp. 3907-3908 XP000524293; ISSN:0034-6748.

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