This range of coolers is used for the cryogenic refrigeration by Joule-Thomson cycle, in a temperature range of 80-100° K, of infrared detectors or electronic components, on the ground or on-board, in conditions of harsh environmental stress such as defense systems.
For this type of application, the technological simplicity and sturdiness of miniature coolers based on a compressed gas unit are evidence of reliability and ease of integration.
The range comprises coolers that differ according to refrigerant capacity, cool-down time and autonomy specific to the application. These levels of performance are obtained as a function of the type of gas used, pure gas like nitrogen or argon, or gas mixture, and the inlet pressure of this gas.
These coolers comprise:
JT coolers are mounted in cryostats with thermal insulation vacuum. The gas is liquefied at the well bottom on which the infrared detector for cooling is assembled.
|Single flow JT||Dual flow JT||Metered JT|
|Cool-down time at 20°C||< 2 s||< 10 s||< 60 s|
|100 K||95 K||80 K|
|Gas used||Argon||Argon or mixtures||Nitrogen|
|Typical autonomies||> 10 s||> 1 mn||> 1 h|
|Main applications||Missile homing devices||Missile homing devices||Missile homing devices, radar, thermal cameras|
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