Electricity: measuring and testing – A material property using electrostatic phenomenon
Patent
1997-10-30
2000-11-21
Metjahic, Safet
Electricity: measuring and testing
A material property using electrostatic phenomenon
324456, 324457, 399 73, G01N 2760
Patent
active
061508241
ABSTRACT:
A contactless process for detecting electrical patterns on the outer surface of a member comprising providing a member having a charge pattern on an outer surface, repetitively measuring the charge pattern on the outer surface of the member with an electrostatic voltmeter probe maintained at a substantially constant distance from the surface, the distance between the probe and the imaging member being slightly greater than the minimum distance at which Paschen breakdown will occur to form a parallel plate capacitor with a gas between the probe and the surface, the frequency of repetition being selected to cause all time dependent signals to fall out of phase by a predetermined amount, and averaging the out of phase time dependent signals over a sufficient number of measuring repetitions to eliminate the time dependent signals. In one embodiment, the contactless process detects surface potential charge patterns in an electrostatographic imaging member. Apparatus for carrying out these processes are also described.
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Domm Edward A.
Mesbah Samy A.
Mishra Satchidanand
Nonkes Steven P.
Popovic Zoran D.
Metjahic Safet
Solis Jose M.
Xerox Corporation
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