DETECTION APPARATUS

IMS apparatus has an inlet with a preconcentrator (9) opening into a reaction region (3, 103) where analyte molecules are ionized and passed via a shutter (11) to a drift region (2), (102) for collection and analysis. A pump (21) and filter (22, 23) arrangement supplies a flushing flow of clean gas...

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Bibliographic Details
Main Author TAYLOR, STEPHEN JOHN
Format Patent
LanguageEnglish
French
Published 03.01.2017
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:IMS apparatus has an inlet with a preconcentrator (9) opening into a reaction region (3, 103) where analyte molecules are ionized and passed via a shutter (11) to a drift region (2), (102) for collection and analysis. A pump (21) and filter (22, 23) arrangement supplies a flushing flow of clean gas to the housing (1), (101) in opposition to ion flow. A pressure pulser (8) connects with the housing (1, 101) and is momentarily switched to cause a short drop in pressure, in the housing to draw in a bolus of analyte sample from the preconcentrator (9). Just prior to admitting a bolus of sample, the pump (21) is turned off so that the flushing flow drops substantially to zero, thereby prolonging the time the analyte molecules spend in the reaction region (3).
Bibliography:Application Number: CA20072672178