Radiant energy – Infrared-to-visible imaging
Patent
1993-02-12
1994-11-15
Gutierrez, Diego F. F.
Radiant energy
Infrared-to-visible imaging
374124, 356432T, G01J 508, G01J 500
Patent
active
053650654
ABSTRACT:
All spatial elements of the thermal-wave image generated in a heated material sample are detected simultaneously, or `in parallel`, in the invention by the use of an optical-wavelength interferometer whose sensing arm contains a combination of the heated material sample, contacted to a thermally conductive, optically reflective material layer, which is in turn contacted to a phase-shift medium comprised of an optically transmissive layer of condensed phase material through which the interferometer beam passes and is reflected by the optically reflective material layer. The invention thus converts a thermal-wave image into an optical wavelength interferometric image which can then be rapidly detected in parallel and with high sensitivity using a video-camera or other optical recording device. The invention is over one hundred times more sensitive than prior art interferometric instruments which use air as the phase-shift medium.
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"An interferometric calorimeter for thin-film thermal diffusivity measurements", K. L. Saenger, J. Appl. Phys. 65(4), Feb. 15, 1989, pp. 1447-1452.
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