“…TDC's #5 through #8 have been used for a range of performance mapping tests, controller tests, transient tests, and some structural dynamic tests. [5][6][7][8] The TDC's were designed for longlife (>100,000 hours) through the use of non-contacting operation in a manner similar to that used on Stirling cryocoolers that are used in space. TDC's #5 through #8 have been used for very focused tests that require operation during the working day with the operator present.…”