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Drift in Cryogenically Cooled Photodetectors: Causes and Cures

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Cryogenically cooled detectors exhibit drifts in their output with time. Users should select Dewars with metal O-rings whenever possible and should evacuate and bake the Dewars periodically.

Infrared photodetectors benefit greatly from cooling to cryogenic temperatures. For this reason, manufacturers mount the majority of these instruments in evacuated Dewars that use cryogenic coolants such as liquid nitrogen or helium (Figure 1). Figure 1. Cryogenically cooled infrared detectors display a lower drift in responsivity when mounted in liquid-nitrogen-cooled Dewars with metal O-rings and cemented windows. Dewars with rubber O-rings suffer more from moisture leakage. Laboratories around the world employ these detectors. Until recently, however, nobody reported that their...Read full article

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    Published: April 2006
    CoatingsDewarsFeaturesInfrared photodetectorsliquid nitrogenSensors & Detectorsspectroscopy

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