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WO2004013626A1 - Detecteur spectroscopique de mobilite ionique amelioree - Google Patents

Detecteur spectroscopique de mobilite ionique amelioree Download PDF

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Publication number
WO2004013626A1
WO2004013626A1 PCT/GB2003/003214 GB0303214W WO2004013626A1 WO 2004013626 A1 WO2004013626 A1 WO 2004013626A1 GB 0303214 W GB0303214 W GB 0303214W WO 2004013626 A1 WO2004013626 A1 WO 2004013626A1
Authority
WO
WIPO (PCT)
Prior art keywords
detector
vapour
ims
inlet
intake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/GB2003/003214
Other languages
English (en)
Inventor
Neil Julian Underwood
Gary Ross Hodges
David John West
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to AU2003248952A priority Critical patent/AU2003248952A1/en
Publication of WO2004013626A1 publication Critical patent/WO2004013626A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/62—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating the ionisation of gases, e.g. aerosols; by investigating electric discharges, e.g. emission of cathode
    • G01N27/622—Ion mobility spectrometry

Definitions

  • the current invention concerns the analytical technique of Ion Mobility Spectroscopy.
  • IMS Ion Mobility Spectroscopy
  • an IMS based detector if an IMS based detector is exposed to high concentrations of analyte vapour, it will take a long time to clear down once it is removed from the source unless some form of action is taken, for example manual intervention or operation of a reverse inlet flow protection system.
  • vapour concentration is reduced by mixing it with air or other gas and most types of vapour generator, used to test detection devices, are based on this method.
  • the ratio of vapour laden air mixed with clean air is carefully controlled either manually or with valves and flow meters or mass flow controllers. Although this method works well under laboratory conditions it is too complex and difficult to control under field conditions.
  • the one second time limit takes into account the time to draw vapour sample into the inlet system, through any membrane interface that may be employed and into the IMS cell. Added to this is the signal processing time, particularly at low vapour concentrations where signal averaging techniques are employed.
  • the current invention provides an improvement to a standard IMS detector that gives rise to increased dynamic range and reduced likelihood of saturation.
  • an IMS detector having a detector inlet is characterised by means for switching the detector inlet between a non-filtered intake and a filtered intake in a periodic fashion.
  • the times within each period that the detector inlet is connected to each intake are substantially the same, or smaller, than the response time of the detector.
  • a method of analysing a vapour analyte in an ambient gas comprises the step of detecting the vapour analyte using an IMS detector having a detector inlet and is characterised by the step of switching the detector inlet between a non-filtered intake and a filtered intake in a periodic fashion.
  • FIG 1 is a schematic representation of an IMS detection system according to the invention.
  • figure 2 shows the output of a detector according to the invention at two valve switching time ratios
  • FIG 3 shows the output of a vehicle mounted detector according to the current invention.
  • a detector of the current invention generally designated 11 , comprises a standard IMS detector 1 having a detector inlet 2 which is switchable between a non-filtered intake 3 and an intake 4 having a filter 5 (a filtered intake) by means of a solenoid operated valve 6.
  • detector inlet 2 is rapidly switched between intakes 3 and 4. Switching is effected in a periodic fashion whereby during each period, the detector inlet 2 is connected to the unfiltered inlet 3 and the filtered inlet 4 for a respective pre-determined time.
  • the detector instead of trying to mix two flows of air as in the prior art (an analogue approach) the detector either draws in ambient air (containing vapour) or filtered clean air.
  • the vapour concentration is effectively diluted by the same ratio as the time spent sampling ambient air to that spent sampling filtered air (a digital approach).
  • the IMS detector 1 used was a Chemical Agent Monitor (CAM) manufactured by Graseby Dynamics, 765 Finchley Road, London NW11 8DS.
  • CAM Chemical Agent Monitor
  • the filter 5 was a standard British military respirator filter. Use of such a low resistance filter allows reliance on the internal air inlet pump of the detector rather than having additional pumps or other means of pressurising the inlet air.
  • the two way solenoid valve 6 used is supplied by Production Techniques Ltd (part no. SV1 D-3-11T) and was chosen to have low vapour adsorption properties at those parts with which vapour comes into contact.
  • Control of the valve 6 was achieved by monitoring the serial output of the detector 1 using a laptop PC (not shown) programmed in Microsoft® Qbasic®.
  • the parallel port of the PC was used for control of the solenoid valve; the control programme turns the solenoid valve on once the output from the IMS 1 exceeds a predetermined value. This was initially set at 7 bars on the CAM display.
  • the control programme then pulses the valve on and off in a periodic fashion wherein the times that the valve is on and off (the valve dwell times for filtered air and unfiltered air respectively) are selected to achieve the desired dilution factor. The pulsing continues until the IMS output falls to 3 bars on the CAM display.
  • the process repeats if the IMS output reaches 7 bars again.
  • the detector 1 was connected to a vapour generator (Graseby model GI10) to determine its response to undiluted vapour. Vapour samples were also collected on to PoraPak® tubes to determine vapour concentration using gas chromatography techniques.
  • the detector 1 was next connected to the dilution unit and various valve dwell times were investigated at two concentrations of methyl salicylate (MS) namely 1.77 mgm "3 and 21.4 mgm "3 .
  • MS methyl salicylate
  • detector output at two valve dwell time ratios are shown.
  • the upper trace represents data obtained with dwell times of 1.5s on and 0.05s off and the lower trace represents data obtained with dwell times of 5s on and 0.05s off.
  • FIG. 3 A typical set of data is shown in figure 3. The dilution system was on in the region of the graph where the horizontal line is at the top of the graph.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

L'invention concerne un détecteur spectrocopique de mobilité ionique (IMS) qui accomplit une dilution fiable d'un analyte vapeur par commutation de l'admission du détecteur entre une admission filtrée et une admission non filtrée d'une manière périodique contrôlée.
PCT/GB2003/003214 2002-08-01 2003-07-29 Detecteur spectroscopique de mobilite ionique amelioree Ceased WO2004013626A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003248952A AU2003248952A1 (en) 2002-08-01 2003-07-29 Ion improved mobility spectroscopy detector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0217746.7A GB0217746D0 (en) 2002-08-01 2002-08-01 Improved ion mobility spectroscopy detector
GB0217746.7 2002-08-01

Publications (1)

Publication Number Publication Date
WO2004013626A1 true WO2004013626A1 (fr) 2004-02-12

Family

ID=9941454

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2003/003214 Ceased WO2004013626A1 (fr) 2002-08-01 2003-07-29 Detecteur spectroscopique de mobilite ionique amelioree

Country Status (3)

Country Link
AU (1) AU2003248952A1 (fr)
GB (1) GB0217746D0 (fr)
WO (1) WO2004013626A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112114024A (zh) * 2019-06-19 2020-12-22 中国科学院大连化学物理研究所 一种用于提高离子迁移谱定量分析准确性的进样装置和方法及其应用

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD295020A5 (de) * 1990-06-05 1991-10-17 Adw Zentralinstitut Fuer Isotopen Und Strahlenforschung,De Verfahren und vorrichtung zum selektiven nachweiss von phosphororganischen kampfstoffen
US5283199A (en) * 1990-06-01 1994-02-01 Environmental Technologies Group, Inc. Chlorine dioxide monitor based on ion mobility spectrometry with selective dopant chemistry
US5345809A (en) * 1989-06-09 1994-09-13 Research Corporation Technologies, Inc. Explosive detection screening system
DE19502674C1 (de) * 1995-01-20 1996-09-12 Inst Umwelttechnologien Gmbh Ionenmobilitätsspektrometer mit interner GC-Säule
WO1997038302A1 (fr) * 1996-04-04 1997-10-16 Mine Safety Appliances Company Systeme de filtration a recirculation pour spectrometre de mobilite ionique portable
US5736739A (en) * 1996-04-04 1998-04-07 Mine Safety Appliances Company Recirculating filtration system for use with a transportable ion mobility spectrometer in gas chromatography applications

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5345809A (en) * 1989-06-09 1994-09-13 Research Corporation Technologies, Inc. Explosive detection screening system
US5283199A (en) * 1990-06-01 1994-02-01 Environmental Technologies Group, Inc. Chlorine dioxide monitor based on ion mobility spectrometry with selective dopant chemistry
DD295020A5 (de) * 1990-06-05 1991-10-17 Adw Zentralinstitut Fuer Isotopen Und Strahlenforschung,De Verfahren und vorrichtung zum selektiven nachweiss von phosphororganischen kampfstoffen
DE19502674C1 (de) * 1995-01-20 1996-09-12 Inst Umwelttechnologien Gmbh Ionenmobilitätsspektrometer mit interner GC-Säule
WO1997038302A1 (fr) * 1996-04-04 1997-10-16 Mine Safety Appliances Company Systeme de filtration a recirculation pour spectrometre de mobilite ionique portable
US5736739A (en) * 1996-04-04 1998-04-07 Mine Safety Appliances Company Recirculating filtration system for use with a transportable ion mobility spectrometer in gas chromatography applications

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112114024A (zh) * 2019-06-19 2020-12-22 中国科学院大连化学物理研究所 一种用于提高离子迁移谱定量分析准确性的进样装置和方法及其应用

Also Published As

Publication number Publication date
AU2003248952A1 (en) 2004-02-23
GB0217746D0 (en) 2002-09-11

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