Engineers from the University of Wisconsin-Madison have found a technique for measuring the temperature within objects – depth thermography – which could prove valuable in situations where traditional temperature probes cannot be used.
Many temperature sensors such as thermal-imaging cameras measure thermal radiation emanating from the surface of an object, of which most falls within the infrared spectrum. Hotter objects emit higher-frequency radiation, which can edge into the visible light spectrum and cause an object to glow visibly.
The technique developed by the University of Wisconsin-Madison engineers makes it possible to look beneath the surface of some materials via “depth thermography.” It works with a class of materials which are partially transparent to infrared radiation.
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