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

Claim 0:
1. A system for widefield imaging of infrared absorption properties of a sample using a photothermal effect, the system comprising:
an infrared pump source configured to generate an infrared pump beam;
a probe source configured to generate a probe beam;
at least one pulse generator configured to initiate a series of synchronized pulses of the infrared pump beam and the probe beam;
an image sensor configured to collect:
a hot frame comprising a spatially-resolved image of probe light collected from the sample with the infrared pump beam intersecting the probe beam at the sample; and
a cold frame comprising a spatially-resolved image of probe light collected from the sample with a reduced intensity of the infrared pump beam intersecting the probe beam at the sample; and
a processor configured to measure a change between the hot frame and the cold frame to simultaneously generate a plurality of signals indicative of a level of infrared absorption at each of a corresponding plurality of spatially-resolved points on the sample.