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. 30, 1995
Filed:
Apr. 29, 1994
Byron L Carnahan, Pittsburgh, PA (US);
Alexander S Tarassov, Mars, PA (US);
Mine Safety Appliances Company, Pittsburgh, PA (US);
Abstract
An ion mobility spectrometer having a housing with an analyzer positioned therein. The analyzer includes first and second longitudinally spaced apart electrodes which are preferably cylindrical in configuration. The space between the electrodes defines an analytical gap which is in communication with a source of carrier gas. An ionization source such as a .beta.-emitter or corona discharge is juxtaposed with the analytical gap and source of sample media and includes an ion aperture for ions to enter said gap. The spectrometer includes an ion detector for measuring ions. An electrical controller connected to the first and second electrodes for impressing a first direct potential and second periodic asymmetrical potential capable of creating a transverse electrical field therebetween during the flow of carrier gas in the analytical gap. Preferably, a third low voltage ripple potential is impressed in series with the first two potentials. A third electrode, normally the ionization source, for electrically migrating the ions formed by the source into the analytical gap is positioned proximate to the ion aperture.