Device to detect pressure in an x-ray tube

Details Device to detect pressure in an x-ray tube Device to detect pressure in an x-ray tube

2005-11-01

2005-11-01

Glick, Edward J. (Department: 2882)

X-ray or gamma ray systems or devices

Source

Electron tube

C378S123000, C378S109000, C378S111000

Reexamination Certificate

active

06961407

ABSTRACT:
In a method to detect the pressure in an x-ray tube having a cathode of the x-ray tube that is heated with a heater current, and wherein electrons are accelerated between the cathode and an anode by an applied x-ray tube voltage, the heater current is measured, a tube current corresponding to the tube -ray voltage is measured, the difference between the measured heater current and the measured tube current is determined or the temporal change of the measured heater current or of the measured tube current is determined, the difference or the temporal change is compared with predetermined calibration values, and a value representing the pressure in the x-ray tube is determined from the comparison.

REFERENCES:
patent: 4379977 (1983-04-01), Carmel et al.
patent: 4853946 (1989-08-01), Elliott et al.
patent: 4862489 (1989-08-01), Appelt
patent: 6192106 (2001-02-01), Miller et al.
patent: 6586729 (2003-07-01), Döring
patent: 197 07 726 (1998-09-01), None
patent: 196 18 122 (2003-04-01), None

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