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- W2072613552 abstract "Novel compact and low power consuming cooled infrared thermal imagers as used in gyro-stabilized payloads ofminiature unmanned aerial vehicles, Thermal small arms sights and tactical night vision goggles often rely on integralrotary micro-miniature closed cycle Stirling cryogenic engines.Development of EPI Antimonides technology and optimization of MCT technology allowed decreasing in order ofmagnitudes the level of dark current in infrared detectors thus enabling an increase in the optimal focal planetemperature in excess of 95K while keeping the same radiometric performances as achieved at 77K using regulartechnologies.Maintaining focal plane temperature in the range of 95K to 110K instead of 77K improves the efficiency of Stirlingthermodynamic cycle thus enlarging cooling power and enabling the development of a mini micro cooler similar toRICOR's K562S model which is three times smaller, lighter and more compact than a standard tactical cryocooler likeRICOR's K508 model.This cooler also features a new type of ball bearings and internal components which were optimized to fit tight bulkconstraints and maintain the required life span, while keeping a low level of vibration and noise signature. Further, thefunctions of management the brushless DC motor and temperature stabilization are delivered by the newly developedhigh performance sensorless digital controller.By reducing Dewar Detector thermal losses and increasing the focal plane temperature, longer life time operation isexpected as was proved with RICOR's K508 model.Resulting from this development, the RICOR K562S model cryogenic engine consumes 1.2 - 3.0 WDC while operatingin the closed loop mode and maintaining the typical focal plane arrays at 200-100K. This makes it compatible with verycompact battery packages allowing further reduction of the overall thermal imager weight thus making it comparablewith the compatible uncooled infrared thermal imager relying on a microbolometer detector in terms of powerconsumption and bulk." @default.
- W2072613552 created "2016-06-24" @default.
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- W2072613552 date "2009-05-01" @default.
- W2072613552 modified "2023-10-12" @default.
- W2072613552 title "Microminiature rotary Stirling cryocooler for compact, lightweight, and low-power thermal imaging systems" @default.
- W2072613552 cites W2031834371 @default.
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- W2072613552 doi "https://doi.org/10.1117/12.818427" @default.
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