Joule-Thomson coolers have been widely used in infrared photo-detector, which have their unique advantages with respect to compact, light and low cost. The performance of Joule-Thomson coolers is required to be improved with the development of higher mass and larger diameter focal plane infrared photo-detector. In order to maximize the usage time and minimize the cooling down time for a given volume of stored gas for Joule-Thomson coolers, it is important to study on fluid flow and heat transfer of Joule-Thomson coolers. Experiments and analysis are carried on to investigate the parameters of Joule-Thomson coolers. The effects of ambient temperatures are considered. It is useful to study the performance of Joule-Thomson coolers for large diameter focal plane infrared photo-detector. Deep research on Joule-Thomson coolers will be helpful to explore optimization of the Joule-Thomson coolers for infrared photo-detectors.
Joule-Thomson have their unique advantages with respect to compact, light and low cost. It is necessary to explore the performance of Joule-Thomson coolers in order to develop their uses for higher mass and larger diameter focal plane infrared photo-detector. Experiments and analysis are carried on to investigate the parameters of Joule-Thomson coolers. The effects of supply pressures at high ambient temperatures are be focused. It is very helpful to study the performance of Joule-Thomson coolers for large diameter focal plane infrared photo-detector. Deep research on Joule-Thomson coolers will be useful to explore optimization of the Joule-Thomson coolers for infrared photo-detectors.
Pulse tube refrigerators have demonstrated many advantages with respect to temperature stability, vibration, reliability and lifetime among cryo-coolers for detectors. Double-inlet type pulse tube refrigerators are popular in GM type pulse tube refrigerators. The single double-inlet valve may introduce DC flow in refrigerator, which deteriorates the performance of pulse tube refrigerator. One new type of DC control mode is introduced in this paper. Two parallel-placed needle valves with opposite direction named double-valve configuration, instead of single double-inlet valve, are used in our experiment to reduce the DC flow. With two double-inlet operating, the lowest cold end temperature of 18.1K and a coolant of 1.2W@20K have been obtained. It has proved that this method is useful for controlling DC flow of the pulse tube refrigerators, which is very important to understand the characters of pulse tube refrigerators for detectors.
Joule-Thomson cooler have its unique advantages with respect to compact, light and low cost. Joule-Thomson coolers
have been widely used in HgCdTe infrared detectors, InSb infrared detectors and InAs/GaSb superlattice infrared
detectors. The performance of Joule-Thomson coolers is required to be improved with the development of higher mass
and larger diameter focal plane infrared detectors. Joule-Thomson coolers use a limited supply of high pressure gas to
support the cooling of infrared detectors. In order to maximize the usage time and minimize the cooling down time for a
given volume of stored gas for Joule-Thomson coolers, it is important to study on fluid flow of Joule-Thomson coolers.
Experiments were carried out to focus on the performance of Joule-Thomson coolers coupled with infrared detectors.
The effect of ambient temperature, the state of supply gas pressure is considered. The relationship between volume rates
and supply gas pressure was proved to fit some regulates while the other parameters are fixed. Moreover, the effects of
ambient temperature are analyzed.
Joule-Thomson coolers have been widely used in infrared detectors with respect to compact, light and low cost.
For self-regulating Joule-Thomson cooler, its performance is required to be improved with the development of higher
mass and larger diameter of focal plane infrared detectors. Self-regulating Joule-Thomson coolers use a limited supply of
high pressure gas to support the cooling of infrared detectors. In order to develop Joule-Thomson coolers with a given
volume of stored gas, it is important to study on fluid flow and heat transfer of Joule-Thomson coolers coupled with
infrared detectors, especially the starting time of Joule-Thomson coolers.
A serial of experiments of Joule-Thomson coolers coupled with 128×128 focal plane infrared detectors have been
carried out. The exchanger of coolers are made of a d=0.5mm capillary finned with a copper wire. The coolers are
self-regulated by bellows and the diameters are about 8mm. Nitrogen is used as working gas. The effect of pressure of
working gas has been studied. The relation between starting time and pressure of working gas is proved to fit exponential
decay. Error analysis has also been carried.
It is crucial to study the performance of Joule-Thomson coolers coupled with infrared detectors. Deeper research
on Joule-Thomson coolers will be carried on to improve the Joule-Thomson coolers for infrared detectors.
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