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==History==
The first demonstrations of the superconducting transition's measurement potential appeared in the 1940s, thirty years after [[Heike Kamerlingh Onnes|Onnes]]'s discovery of [[superconductivity]]. D.H. Andrews demonstrated the first transition-edge [[bolometer]], a current-biased [[tantalum]] wire which he used to measure an infrared signal. Subsequently he demonstrated a transition-edge [[Calorimeter (particle physics)|calorimeter]] made of [[niobium nitride]] which was used to measure [[alpha particles]].<ref>D.H. Andrews ''et al.'', "Attenuated superconductors I. For measuring infra-red radiation." ''Rev. Sci. Instrum.'', '''13''', 281 (1942), {{doi|10.1063/1.1770037}}</ref> However, the TES detector did not gain popularity for about 50 years, due primarily to the difficulty of signal readout from such a low-[[Electrical impedance|impedance]] system. A second obstacle to the adoption of TES detectors was in achieving stable operation in the narrow superconducting transition region. [[Joule heating]] in a current-biased TES can lead to thermal runaway that drives the detector into the normal (non-superconducting) state, a phenomenon known as
==Setup, operation, and readout==
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