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A '''transition edge sensor''' or '''TES''' is a kind of [[thermistor]]. It consists of a [[superconductor]], often [[aluminum]] or [[titanium]], held right at its [[Superconductor#Superconducting phase transition|critical temperature]]. If the temperature increases by even a small amount, then the superconducting phase breaks. The sudden rise in resistance can be used to measure the very small changes in temperature. TES arrays are becoming increasingly common in physics and astronomy experiments such as the [[South Pole Telescope]].
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