Patent ID: 11860087
Assignee: THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The method of claim 1, further comprising:
generating a second plurality of sets of probe measurements for the plurality of sample locations located across the surface of the sample, wherein generating, for a particular sample location, a particular set of probe measurements of the second plurality of sets of probe measurements comprises:
generating a first probe measurement of the particular set of probe measurements by illuminating the sample with infrared light at a second wavelength that varies at the first frequency, wherein the second wavelength differs from the first wavelength, and measuring a magnitude and phase of a variation in displacement of the surface of the sample over time at the particular sample location at the first frequency; and
generating a second probe measurement of the particular set of probe measurements by illuminating the sample with infrared light at the second wavelength that varies at the second frequency and measuring a magnitude and phase of a variation in displacement of the surface of the sample over time at the particular sample location at the second frequency, wherein the first frequency and the second frequency differ; and

generating, based on the second plurality of sets of probe measurements, a three-dimensional tomographic map of absorption of infrared light at the second wavelength by the sample.