X-ray or gamma ray systems or devices – Electronic circuit – With switching means
Patent
1995-10-02
1997-07-22
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
With switching means
378 95, H05G 154
Patent
active
056510446
ABSTRACT:
A capacitive proximity detection system for positioning a movable radiation imaging element support structure with respect to a subject includes a plurality of sensor plates disposed in a collar assembly around a portion of an imaging component disposed towards a subject; a multiplexer coupled to the plurality of capacitive plate elements and adapted to selectively electrically couple the sensor plate elements in one of a plurality of sensing range modalities; and a capacitive sensing processor coupled to the sensor plate elements via the multiplexer so as to detect proximity of object to the sensor plate as a function of the capacitance between the sensor plates and the subject. The imaging system typically further includes a shield system coupled to the multiplexer and disposed so as to focus the capacitive sensing of the sensor plate elements towards the subject. The shield system includes a plurality of shielding plate elements disposed in a shielding pattern that corresponds with the pattern of sensor plate elements in the collar assembly. The shield plate elements are coupled to the capacitive sensing processor to receive a shield plate feedback signal therefrom.
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Application entitled "Ultrasonic Ranging System for Radiation Imager Position Control," Ser. No. 08/537/576, filed Oct. 2, 1995.
Application entitled, "Imager Control System With Contact Detector," Ser. No. 08/537,580, filed Oct. 2, 1995.
Badami Vivek Venugopal
Bedard James Frederick
Goodman George Charles
Klotz, Jr. Theodore Henry
Whipple, III Walter
General Electric Company
Ingraham Donald S.
Porta David P.
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