Ion mobility spectrometer with parallel drift gas and ion carrier gas flows

US7417224B2 · kind B2 · utility

Assignee

• Dräger Saftey AG & Co. KGaA · DE

Inventors

• Stefan Zimmermann · Laufenbürg, DE
• Wolfgang Bather · Lübeck, DE

Key dates

• Filing date: May 24, 2006
• Grant date: Aug 26, 2008
• Expiry date: Nov 25, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J49/40
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An ion mobility spectrometer is provided with at least one ionization chamber (1) through which analyte-containing gas can flow. A radiation source (2) is provided from which ionizing radiation is suitable for ionizing the analyte-containing gas at least partially, enters the ionization space (1). A separation area is located behind the ionization space (1) in the direction of flow, into which the partially ionized gas is admitted as an ion carrier gas (4) and a nearly ion-free gas is admitted as a drift gas (5) in such a way that a flow in which predominantly ion carrier gas (4) flows through cross-sectional areas (6) and predominantly drift gas (5) flows through other cross-sectional areas (7, 7′), becomes established at least in the inlet area of the separation area (8). The drift gas (5) and ion carrier gas (4) flow unidirectionally and the cross-sectional areas (6), through which predominantly ion carrier gas (4) flows, are smaller in at least one dimension than the cross-sectional areas (7, 7′), through which predominantly drift gas (5) flows.