17 September 1998 Evaluation of vibration generated by closed-cycle refrigeration system using optical methods
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Abstract
A simple optical method for studying vibration has been developed and applied to the investigation of a commercial closed cycle refrigeration (CCR) system. This method utilizes an amplitude modulation of a laser beam by the knife-edge attached to the cold finger of the CCR system. The sensitivity of the proposed optical technique is determined by the diameter of the focused laser beam and a displacement of 1 micrometers is readily detectable. For the system CRYO Model 396-022 based on CTI CRYODYNE Model 22 refrigerator, experimental studies were conducted for different cold finger temperatures, cold head orientations, and mechanical holders. The total amplitude of the displacement was on the order of 50 micrometers for a cold head fixed into rigid mechanical holder placed on the optical table and 30 micrometers for the same holder placed on a special stand decoupled from the optical table. Three main frequency components at 3 Hz, 60 Hz, and 120 Hz have been observed.
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Alexander A. Vaysman, Alexey V. Turukhin, Anshel A. Gorokhovsky, "Evaluation of vibration generated by closed-cycle refrigeration system using optical methods", Proc. SPIE 3435, Cryogenic Optical Systems and Instruments VIII, (17 September 1998); doi: 10.1117/12.323732; https://doi.org/10.1117/12.323732
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