Recently developed high operational temperature (HOT) infrared detectors are designed to be integrated upon very short, small diameter cold fingers and to show their best performance when cooled to 150K and above.
This implies severe limitations on the routinely used LN2 boil-off isothermal calorimetry of Integrated Dewar-Detector Assemblies (IDDA). The authors adapted technique of warm-up calorimetry and show that the accurate heat load evaluation may be performed by precooling the IDDA and comparing the warm-up slopes of the thermal transient processes under different trial added heat loads.
Because of the simplicity, accuracy and ability to perform calorimetry literally at any temperature of interest, this technique shows good potential for replacing traditional boil-off calorimetry. The authors are reporting on developing computerized test station performing automatic warm-up calorimetry of HOT IDDA. They also reveal some statistical data in support of attainable repeatability and accuracy.
Alexander Veprik, Baruch Shlomovich, and Avi Tuito, "Practical aspects of using warm-up calorimetry of HOT integrated Dewar detector assemblies (Conference Presentation)," Proc. SPIE 10626, Tri-Technology Device Refrigeration (TTDR) III, 106260J (Presented at SPIE Defense + Security: April 19, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2309336.5783678311001.
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