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. 27, 2008
Filed:
Aug. 15, 2006
Frederick Glesius, Brecksville, OH (US);
Frederick Glesius, Brecksville, OH (US);
General Electric Company, Schenectady, NY (US);
Abstract
A velocity transducer or Velomitor® that can output electrical signals relating to vibration, despite the transducer being exposed to low levels of gamma-radiation, is disclosed. A DC feedback circuit, which sets up the input stage bias point, keeps the output bias voltage within a usable voltage range as the transducer is exposed to the gamma-radiation. An additional JFET transistor, configured as a current source, helps the DC feedback circuit compensate for increases in the offset voltage of the JFET amplifier. The value of a resistor controlling the gate current of the JFET amplifier is also reduced, such that when the leakage current increases, the offset voltage is reduced.