Deicing device for cryogenically cooled radiation detector

Details Deicing device for cryogenically cooled radiation detector Deicing device for cryogenically cooled radiation detector

1992-04-02

1993-12-28

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Semiconductor system

G01T 100

Patent

active

052742377

ABSTRACT:
An X-ray radiation detector is thermally conductively secured to the end of a cryogenically cooled copper cold finger in an evacuated atmosphere. A collimator having a conical radiation conduit at a relatively low evacuated pressure is thermally conductively secured to the end of the cold finger for passing radiation emitted by an electron microscope and reflected from a specimen to the detector in a windowless environment. The collimator and cold finger are at about the same cryogenic temperature. The detector is maintained at a temperature of a few degrees C. above that of the collimator. The collimator conduit radiation ingress aperture is dimensioned to limit gas flow to the conduit to limit moisture flow into the conduit and to the detector, the gas flow being molecular in a low pressure atmosphere. Due to the temperature differential between the detector and collimator, moisture sublimes from the detector to the collimator inside the conduit where the moisture adheres to the collimator as ice providing a relatively ice free detector for long term continuous operation.

REFERENCES:
patent: 3011057 (1961-11-01), Anger
patent: 3746873 (1973-07-01), Williams
patent: 4474036 (1984-10-01), Ball et al.
patent: 4886240 (1989-12-01), Rich
patent: 4931650 (1990-06-01), Lowe et al.
patent: 4952810 (1990-08-01), Gustafson et al.
patent: 4954708 (1990-09-01), Salzer et al.
patent: 4955204 (1990-09-01), Pehl et al.

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