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:
Apr. 05, 1994
Filed:
Feb. 18, 1993
David K Davies, Churchill Borough, PA (US);
Thermo King Corporation, Minneapolis, MN (US);
Abstract
An ion mobility sensor for obtaining measurements of concentrations of constituents of multicomponent gaseous samples. The sensor having an ionization region into which the sample is entered connected to a drift region, the regions being separated by a grid electrode. A first electrode is disposed at an end of the ionization region opposite to the grid electrode. A collector electrode is provided at an end of the drift region opposite to the grid electrode and DC voltages are applied by the electrodes so as to create a unidirectional field across the sensor. A pulse of UV light is directed toward the grid electrode. A voltage pulse of selected magnitude is superimposed at the first electrode within the pulse width of the UV pulse. Ions characteristic of the sample travel through the grid electrode, across the drift region to the collector electrode. The electrical output in accordance with any ions received at the collector electrode is then measured.