低温冷却器
斯特林发动机
探测器
机械工程
工作温度
计算机科学
斯特林循环
热的
材料科学
光学
物理
电气工程
工程类
气象学
作者
Avishai Filis,Zvi Bar Haim,Nachman Pundak,Ramon Broyde
摘要
Novel compact and low power consuming cooled infrared thermal imagers as used in gyro-stabilized payloads of
miniature unmanned aerial vehicles, Thermal small arms sights and tactical night vision goggles often rely on integral
rotary micro-miniature closed cycle Stirling cryogenic engines.
Development of EPI Antimonides technology and optimization of MCT technology allowed decreasing in order of
magnitudes the level of dark current in infrared detectors thus enabling an increase in the optimal focal plane
temperature in excess of 95K while keeping the same radiometric performances as achieved at 77K using regular
technologies.
Maintaining focal plane temperature in the range of 95K to 110K instead of 77K improves the efficiency of Stirling
thermodynamic cycle thus enlarging cooling power and enabling the development of a mini micro cooler similar to
RICOR's K562S model which is three times smaller, lighter and more compact than a standard tactical cryocooler like
RICOR's K508 model.
This cooler also features a new type of ball bearings and internal components which were optimized to fit tight bulk
constraints and maintain the required life span, while keeping a low level of vibration and noise signature. Further, the
functions of management the brushless DC motor and temperature stabilization are delivered by the newly developed
high performance sensorless digital controller.
By reducing Dewar Detector thermal losses and increasing the focal plane temperature, longer life time operation is
expected 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 operating
in the closed loop mode and maintaining the typical focal plane arrays at 200-100K. This makes it compatible with very
compact battery packages allowing further reduction of the overall thermal imager weight thus making it comparable
with the compatible uncooled infrared thermal imager relying on a microbolometer detector in terms of power
consumption and bulk.
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