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Depth Thermography: Noninvasive 3D Temperature Profiling Using Infrared Thermal Emission
journal contribution
posted on 2020-03-19, 20:44 authored by Yuzhe Xiao, Chenghao Wan, Alireza Shahsafi, Jad Salman, Mikhail A. KatsWe introduce a technique based on
infrared thermal emission, termed
depth thermography, that can remotely measure the temperature distribution
beneath the surface of certain objects. Depth thermography utilizes
the thermal-emission spectrum in the semitransparent spectral region
of the target object to extract its temperature as a function of depth,
in contrast with conventional thermography, which uses the spectrally
integrated thermally emitted power to measure the surface temperature.
Coupled with two-dimensional imaging, for example using an infrared
hyperspectral camera or scanning a single-pixel spectrometer, this
technique can yield volumetric temperature distributions. We carried
out a proof-of-concept experiment on an asymmetrically heated fused-silica
window, extracting the temperature distribution throughout the sample.
Depth thermography may enable noncontact volumetric temperature measurements
of microscopic objects such as multilayer electronic devices or macroscopic
volumes of liquids and gases, as well as simultaneous all-optical
measurements of optical and thermal properties of materials.