A thermal-emission spectrum from the semitransparent part of an object's infrared response can be inverted to estimate the temperature at different depths, demonstrated on a heated fused-silica window.
Temperature profile of GaInAs/AlInAs/InP quantum cascade-laser facets measured by microprobe photoluminescence,
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Depth thermography: non-invasive 3D temperature profiling using infrared thermal emission
A thermal-emission spectrum from the semitransparent part of an object's infrared response can be inverted to estimate the temperature at different depths, demonstrated on a heated fused-silica window.