The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 1990
Filed:
Sep. 06, 1989
Bruce T Williams, Lockport, NY (US);
Other;
Abstract
A non-contacting electrostatic voltage follower comprising a detector electrode sensitive to electrostatic quantities such as electrostatic fields, voltages, charges and the like, a modular coupled to the electrode for modulating the capacitance coupling between the electrode and a surface bearing an electrostatic quantity to which the electrode is exposed, a detector amplifier of the current summing type having the summing input thereof connected to the detector electrode, and a high bandwidth amplifier having an input connected to the output of the detector amplifier. A probe comprises a transparent carrier element coupled to the modulator, a first conductive and transparent film on a surface of the carrier and defining the detector electrode, and a second film of conductive and transparent material on the remainder of the surface of the carrier and spaced from the first film. The carrier is disposed in a path for radiation onto the surface for irradiating a region of the surface in registry with the electrode and in a manner such that compensation is made for capacitive fringing effects by allowing for radiation of the fringing areas of the surface coupled to the detector electrode by fringing capacitance.