Patent ID: 11867620
Assignee: PURDUE RESEARCH FOUNDATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 23:
24. A method for measuring infrared absorption properties over a wide area of a sample using a photothermal effect, the method comprising:
providing an infrared pump pulse train;
providing a probe pulse train synchronized with the infrared pump pulse train;
collecting, from the sample, by an image sensor, a hot frame, wherein the hot frame includes a spatially-resolved image of probe light collected from the sample with the infrared pump pulse train intersecting a probe beam at the sample;
collecting, from a substrate, by the image sensor, a cold frame, including a spatially-resolved image of probe light collected from the sample with a reduced intensity of the infrared pump pulse train intersecting the probe pulse train at the sample; and
measuring a change between the hot frame and the cold frame to detect the photothermal effect by simultaneously generating a plurality of signals indicative of a level of infrared absorption at each of a corresponding plurality of spatially-resolved points on the sample.