Cooling of GeZn Detectors by Commercially Available Closed-Cycle Cryogenic Refrigerators
In the late 1960’s, zinc doped germanium (GeZn) detectors were developed for broad range detection in the near infrared spectrum spanning a spectral range of 2 to 40 micron wavelength units with high detectivity.
For optimum use of this detector material, performance data indicated operation at 4.2 Kelvin; i.e., at liquid helium temperature. This being the case, the use of this detector was solely dependent upon the availability of liquid helium, thus limiting or restricting its use both nationally and internationally. It could only be used for applications where factors other than economics warranted its use.
This paper presents a unique and innovative technique for using this broad range, high performance detector by integrating it with a commercially-available, closed-cycle refrigeration system, thus broadening both its application and utility.
KeywordsLiquid Helium Cadmium Telluride Liquid Helium Temperature Detector Material Solid State Device
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- 2.Santa Barbara Research Center, “ Infrared Components Brochure,” Ed. 16. Cover chart, Figure 16 (1982).Google Scholar
- 3.The author gratefully acknowledges the pioneering development efforts of Dr. Don Imhoff, Senior Scientist with Ethyl Corp.’s Process Development Center, Baton Rouge, LA for his contribution to this paper and this technology.Google Scholar
- 4.CTI is a trademark for a series of closed-cycle refrigerators manufactured by Cryogenic Technology, Inc. of Waltham, MA.Google Scholar