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Detector apparatus and pre-concentrators

A pre-concentrator and detector technology, applied in the field of detector equipment, can solve the problems of low signal-to-noise ratio and difficult realization of reliable detection

Inactive Publication Date: 2009-11-18
SMITHS DETECTION WATFORD LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the sample analyte has only a small concentration in the sample gas, there is a relatively low signal-to-noise ratio, which makes reliable detection difficult to achieve

Method used

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  • Detector apparatus and pre-concentrators
  • Detector apparatus and pre-concentrators

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Embodiment Construction

[0011] see first figure 1 , the apparatus takes the form of an ion mobility spectrometer (IMS) having a generally tubular housing 1 with a drift or analysis region 2 at its right-hand end and a reaction or ionization region 3 at its opposite left-hand end .

[0012] The inlet 4 at the left-hand end of the housing 1 communicates with the interior of the reaction zone 3, whereby molecules of interest can enter the reaction zone from the outside. Inlet 4 will be described in detail later.

[0013] The reaction zone 3 contains several means for ionizing the molecules of the analyte, such as high potential corona discharge points 10 . Both reaction zone 3 and drift zone 2 are at atmospheric pressure or only slightly below atmospheric pressure. The reaction region 3 and the drift region 2 are separated from each other by an optional conventional electrostatic shutter, such as a B. Nelson gate 11, which controls the flow of ions into the drift region. The drift region 2 has a ser...

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Abstract

An IMS detector has a pin-hole or capillary inlet (4, 104, 204) having a coating (42, 242) of a material, such as polydimethylsiloxane, which is adsorbent to an analyte substance of interest. The analyte is adsorbed into the material (42, 242) until a heater (43) is energised to heat the material and release the adsorbed analyte substance for detection.

Description

technical field [0001] The present invention relates to a detector device having an inlet in the form of a pinhole or capillary channel through which analyte is allowed to enter the interior of the detector and to be supplied to a preconcentrator. Background technique [0002] Ion Mobility Spectrometry or IMS (Ion Mobility Spectroscopy) devices are often used to detect substances such as explosives, narcotics, corrosive and neurological agents. An IMS device generally includes a detector unit to which an air sample containing a suspect substance or analyte is continuously provided in the form of a gas or vapor. The cell operates at or near atmospheric pressure and contains electrodes to which voltage is applied to create a voltage gradient along the cell. Molecules in the air sample have been ionized (for example by means of a radioactive source, UV source or corona discharge) and are provided to the drift region in the cell by an electrostatic gate at one end. The ionized...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64G01N1/40
CPCG01N27/622G01N1/405Y10T436/255G01N27/64G01N1/40
Inventor S·J·泰勒
Owner SMITHS DETECTION WATFORD LTD
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