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Micro faraday-element array detector for ion mobility spectroscopy

United States Patent

October 26, 2004
View the Complete Patent at the US Patent & Trademark Office
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An ion mobility spectrometer includes a drift tube having a collecting surface covering a collecting area at one end of the tube. The surface comprises a plurality of closely spaced conductive elements on a non-conductive substrate, each conductive element being electrically insulated from each other element. A plurality of capacitive transimpedance amplifiers (CTIA) adjacent the collecting surface are electrically connected to the plurality of elements, so charge from an ion striking an element is transferred to the capacitor of the connected CTIA. A controller counts the charge on the capacitors over a period of time.
Gresham; Christopher A. (Albuquerque, NM), Rodacy; Phillip J. (Albuquerque, NM), Denton; M. Bonner (Tucson, AZ), Sperline; Roger (Tucson, AZ)
Sandia Corporation (Albuquerque, NM)
10/ 390,507
March 17, 2003
The United States Government has rights in this invention pursuant to Department of Energy Contract No. DE-AC04-94AL85000 with Sandia Corporation.