GB2600663A - Systems and methods for improving detection accuracy in electronic trace detectors - Google Patents

Systems and methods for improving detection accuracy in electronic trace detectors Download PDF

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Publication number
GB2600663A
GB2600663A GB2202241.2A GB202202241A GB2600663A GB 2600663 A GB2600663 A GB 2600663A GB 202202241 A GB202202241 A GB 202202241A GB 2600663 A GB2600663 A GB 2600663A
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GB
United Kingdom
Prior art keywords
valve
detection system
mode
trace detection
dry air
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.)
Granted
Application number
GB2202241.2A
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GB202202241D0 (en
GB2600663B (en
Inventor
Douglas Shaw Bradley
Rogers William
Romanov Vladimir
Justin Maines Adam
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.)
Rapiscan Systems Inc
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Rapiscan Systems Inc
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Publication date
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Publication of GB202202241D0 publication Critical patent/GB202202241D0/en
Publication of GB2600663A publication Critical patent/GB2600663A/en
Application granted granted Critical
Publication of GB2600663B publication Critical patent/GB2600663B/en
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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
    • 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
    • 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
    • G01N27/624—Differential mobility spectrometry [DMS]; Field asymmetric-waveform ion mobility spectrometry [FAIMS]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0011—Sample conditioning

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

Embodiments of the present specification provide methods and systems for maintaining accuracy and precision of calibration for a detector. The methods and systems include reducing the humidity of an internal calibration assembly by directing flow path of dry air periodically through the internal calibration assembly.

Claims (24)

1. A method for reducing humidity within an internal calibration chamber of a trace detection system, wherein the trace detection system comprises a first pump coupled with a dryer, a desorber in flow communication with the first pump, a detector in flow communication with the desorber, and an internal calibration assembly defined by a housing and having a first valve, a second valve, and a calibrant source positioned within the housing, wherein when the first valve is in a first state it directs flow directly to at least one of the desorber or the second valve and bypasses the calibrant source and wherein, when the first valve is in a second state, it directs flow through the calibrant source and then to the second valve, the method comprising: in a first mode of operation, operating the first pump to direct air through the dryer in order to form dry air; and operating the first valve to place the first valve in the first state, wherein the first valve is configured to receive the dry air and direct the dry air to the desorber without being in flow communication with the calibrant source; and in a second mode of operation, operating the first pump to direct air through the dryer in order to form dry air; and operating the first valve to place the first valve in the second state, wherein the first valve is configured to receive the dry air and direct the dry air through the second valve and the calibrant source to the desorber.
2. The method of claim 1 further comprising, in the first mode of operation, operating the first valve to direct dry air to the desorber without being in flow communication with the second valve.
3. The method of claim 1 wherein, in the second mode of operation, the dry air has a relative humidity of less than 1%.
4. The method of claim 1 wherein the calibrant source comprises a canister of calibration chemical.
5. The method of claim 4 wherein the calibrant is at least one of dibenzylamine, diethylphenylmalonate, diisopropylphenol, 2,4-dimethylpyridine, dioctylphthalate, dinitrotoluene, dipropylene glycol monomethylether, 2,6-di-t-butylpyridine, ethyl salicylate, hexachloroethane, hexaphenylbenzene, 4-methyl-2,6-di-tert-butyl phenol, methyl salicylate, nicotinamide, 4-nitrobenzonitrile, 5-nitrovanillin, pentachloroethane, trihexylamine, or combinations thereof.
6. The method of claim 1 wherein the internal calibrant assembly is not in flow communication with the trace detection system except through the second valve.
7. The method of claim 1 wherein each of the first valve and second valve comprise at least two ports.
8. The method of claim 1 wherein a flow rate of the air in each of the first mode of operation and second mode of operation is in a range from about 5 mL per minute to about 5000 mL per minute.
9. The method of claim 1 wherein, in a given 24 hour period, the second mode of operation is activated at a plurality of intervals wherein each of the plurality of intervals ranges from a minimum of 30 minutes to a maximum of 24 hours.
10. The method of claim 1 wherein the second mode of operation is performed at least once between 10 p.m. and 6 a.m.
11. The method of claim 1 wherein a relative humidity within the internal calibration assembly does not exceed 3%.
12. The method of claim 1 wherein a relative humidity within the internal calibration assembly does not exceed 6%.
13. A trace detection system comprising: a first housing; an internal calibration assembly defined by a second housing and having a first valve, a second valve, and calibrant source positioned within the second housing; a first pump positioned in the first housing and outside the second housing; a desorber in flow communication with the first pump and positioned in the first housing and outside the second housing; a detector in flow communication with the desorber and positioned in the first housing and outside the second housing; and a controller configured to operate the trace detection system in a first mode and in a second mode, wherein, in the first mode of operation, the controller is configured to operate the first pump to direct air through the dryer to form dry air and direct the dry air to the desorber through the first valve without being in flow communication with the calibrant source; and wherein, in the second mode of operation, the controller is configured to operate the first pump to direct air through the dryer to form dry air, and direct the dry air through the second valve and the calibrant source to the desorber.
14. The trace detection system of claim 13 wherein, in the first mode of operation, the controller is configured to operate the first valve to direct the dry air directly to the desorber without being in flow communication with the second valve.
15. The trace detection system of claim 13 wherein, in the second mode of operation, the dry air has a relative humidity of less than 1%.
16. The trace detection system of claim 13 wherein the calibrant source comprises a canister of calibration chemical.
17. The trace detection system of claim 13 wherein the internal calibrant assembly is only in flow communication with other components of the trace detection system through the second valve.
18. The trace detection system of claim 13 wherein each of the first valve and the second valve comprise at least two ports.
19. The trace detection system of claim 13 wherein a flow rate of the dry air in each of the first mode of operation and the second mode of operation is in a range from about 5 mL per minute to about 5000 mL per minute.
20. The trace detection system of claim 13 wherein the calibrant is at least one of dibenzylamine, diethylphenylmalonate, diisopropylphenol, 2,4-dimethylpyridine, dioctylphthalate, dinitrotoluene, dipropylene glycol monomethylether, 2,6-di-t-butylpyridine, ethyl salicylate, hexachloroethane, hexaphenylbenzene, 4-methyl-2,6-di-tert-butyl phenol, methyl salicylate, nicotinamide, 4-nitrobenzonitrile, 5-nitrovanillin, pentachloroethane, trihexylamine, or combinations thereof.
21. The trace detection system of claim 13 wherein the controller is configured to operate the second mode of operation at regular intervals in a 24 hour period, wherein a time period of the regular intervals varies from a minimum of 30 minutes to a maximum of 24 hours.
22. The trace detection system of claim 13 wherein the controller is configured to operate the second mode of operation at least once during a nighttime cleaning process of the trace detection system.
23. The trace detection system of claim 13 wherein a relative humidity within the internal calibration assembly does not exceed 3%.
24. The trace detection system of claim 13 wherein a relative humidity within the internal calibration assembly does not exceed 6%.
GB2202241.2A 2019-07-31 2019-07-31 Systems and methods for improving detection accuracy in electronic trace detectors Active GB2600663B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2019/044410 WO2021021166A1 (en) 2019-07-31 2019-07-31 Systems and methods for improving detection accuracy in electronic trace detectors

Publications (3)

Publication Number Publication Date
GB202202241D0 GB202202241D0 (en) 2022-04-06
GB2600663A true GB2600663A (en) 2022-05-04
GB2600663B GB2600663B (en) 2023-08-09

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Family Applications (1)

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GB2202241.2A Active GB2600663B (en) 2019-07-31 2019-07-31 Systems and methods for improving detection accuracy in electronic trace detectors

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GB (1) GB2600663B (en)
WO (1) WO2021021166A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4341983A1 (en) * 2021-05-21 2024-03-27 Waters Technologies Ireland Limited Methods, mediums, and systems for providing assisted calibration for a mass spectrometry apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7594422B2 (en) * 2006-10-30 2009-09-29 Ge Homeland Protection, Inc. Apparatus and method for calibrating a trace detection portal
US20180172635A1 (en) * 2016-12-15 2018-06-21 Rapiscan Systems, Inc. Methods and devices for moisture-based calibration
US20180182603A1 (en) * 2016-12-22 2018-06-28 Rapiscan Systems, Inc. Systems and methods for calibration, verification, and sensitivity checks for detectors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7594422B2 (en) * 2006-10-30 2009-09-29 Ge Homeland Protection, Inc. Apparatus and method for calibrating a trace detection portal
US20180172635A1 (en) * 2016-12-15 2018-06-21 Rapiscan Systems, Inc. Methods and devices for moisture-based calibration
US20180182603A1 (en) * 2016-12-22 2018-06-28 Rapiscan Systems, Inc. Systems and methods for calibration, verification, and sensitivity checks for detectors

Also Published As

Publication number Publication date
GB202202241D0 (en) 2022-04-06
WO2021021166A1 (en) 2021-02-04
GB2600663B (en) 2023-08-09

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