Ion mobility spectrometry equipment
AssigneeGraseby Dynamics Limited
InventorRobert F. D. Bradshaw
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Abstract
Ion Mobility Spectrometry (IMS) equipment comprises an enclosed compartment (10) contained within which there is an IMS cell (12) and a body of absorbent material (14). Samples for detection by the cell (12) are introduced into the compartment (10) by means of a pinhole (30), the samples being drawn in by a negative pressure pulse within the compartment produced by means of a loudspeaker (40). A sample, once it has been drawn in and detected by the cell (12), will diffuse within the compartment (10) and any water vapour or other interfering species thus introduced will be absorbed by the absorbent material (14) so maintaining a clean, dry atmosphere within the device.
Claims15
IMS equipment comprising a hermetically sealed compartment containing an IMS cell and a body of absorbent material, sample means for introducing a sample into the compartment via an inlet thereof, the IMS cell being arranged to detect or identify gases or vapours of interest present in the sample, water vapour or other interfering species introduced into or otherwise present within the compartment diffusing within the compartment and being absorbed by the body of absorbent material.
IMS equipment as claimed in any one of the preceding claims in which the body of absorbent material comprises a molecular sieve material.
Dependencies are inferred from the claim text.