G - Physics – 01 – B
Patent
G - Physics
01
B
G01B 9/02 (2006.01) G01B 11/06 (2006.01) G01J 5/00 (2006.01) G01J 9/02 (2006.01) G01N 25/72 (2006.01)
Patent
CA 2080557
A SENSITIVE INTERFERDMETRIC PARALLEL THERMAL-WAVE IMAGER 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 said 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 interferometeric image which can than be rapidly detected in parallel and with high sensitivity using a video-camera or other optical recording means. 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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