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Demonstration of Detection of Hidden Persons and Illegal Substances with an Array of Quantum Cascade Lasers and Cantilever-Enhanced Photoacoustic Spectroscopy

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  • Demonstration of detection of hidden persons and illegal substances with an array of quantum cascade lasers and

    cantilever enhanced photoacoustic spectroscopy

    Sauli Sinisalo, Client Partner, Gasera Ltd.Pittcon 2016, Atlanta, 7th March 2016, 10:45 AM

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    Funded by the European Commission under the FP7-Security programme

    Project started in 2012, ended in November 2015 The Consortium of 14 partners from 5 EU countries

    DOGGIES project aims at demonstrating: An operational movable stand-alone sensor for an efficient detection of hidden persons, drugs & explosives

    Orthogonal trace detection Mid-Infrared spectroscopy, based on photoacoustic detection (PAS) with widely tunable integrated MIR source i.e. MIRPAS

    Ion Mobility Spectrometry (IMS), with non-radioactive ionization source

    Using specific pre-concentrators and advanced software to provide reliable detection in real environments

    DOGGIES = Detection of Olfactory traces by orthoGonal Gas identification technologIES

    DOGGIES-project

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    Consortium and partners

    MirSense

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    Orthogonal trace detectionIon Mobility spectrometryMature and well acceptedCompact designHigh sensitivityHigh selectivity

    Photoacoustic spectroscopyExtreme sensitivityShort optical path, very small dimensions

    Short response timeHigh selectivity

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    Compounds of interestTypical indications of human presence

    Expired air Acetone, Isoprene, Ammonia, CO2Blood (air phase) Acetone, Isoprene, Urine (air phase) Acetone, Various ketonesSweat odor (E & Z)-3-methylhex-2-enoic acid (i.e.3MHA)

    Typical drug precursorsa- and b-pinene (cannabis)Safrole (MDMA/ecstasy)Bentzhyl Methyl Ketone (amphetamine/metamphetamine)

    Typical explosives and taggants2- and 4-nitrotoluene2,4- and 2,6-DinitrotolueneButyl acetate

    Gas library with in total of 52 componentsIncluding a discovery of new cannabis marker (patent pending)

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    Photoacoustic spectroscopyPhotoacoustic Effect

    Discovered in 1880 by Alexander Graham Bell

    This theoretical potential has not been reached, since conventional microphones have been used for sensing the pressure pulses

    Gaseras novel cantilever sensor technology allows the use of the full potential of the photoacoustic phenomena

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    Photoacoustic spectroscopyCantilever Enhanced Photoacoustics MEMS cantilever from silicon Contactless optical measurement based on laser interferometry

    Over 100 times greater physical movement can be achieved compared to conventional microphone membrane

    Measures cantilever displacements smaller than picometer (10-12 m)

    Extremely wide dynamic measurement range

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    Photoacoustic spectroscopy

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    Widely tunable DFB QCL array

    DFB QCLs

    32 DFB QCLs in single chip Integrated photonics multiplexer with SiGE/Si

    and Ge/SiGe waveguides 7.4 m for detection of explosives and drugs 9.1 m for detection of drugs, drug precursors

    and human

    waveguide multiplexer

    Advantages of QCL array room temperature operation robust low cost high stability

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    Expected sensitivitySimulated results for QCL-array (5 mW) with MIRPAS module

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    MIRPAS Chemometrics DOGGIES data analysis approach fuses four independent algorithms trained separately for creating a combined classification training model

    Supervised learning built on a spectroscopic VOC library Library can be unlimitedly updated with new VOCs at anytime

    Trai

    ning

    Mea

    surin

    g

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    MIRPAS Chemometrics

    TRAINING PERFORMANCE

    CONDITION FULFILLED: # VARIABLES > # LIBRARY VOCs

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    Lab testing of the prototypesHeadspace measurement of drugs and explosives with MIRPAS and commercially available EC-QCL.

    Measurements done at INPS, Lyon.

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    Lab testing of the prototypes

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    Lab testing of the prototypesDrug precursors with MIRPAS and commercially available EC-QCL.

    Measurement done at Gasera.

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    Demonstrator for field tests1st QCL array realization 7.4 m, pulsed operated QCL 9/22 QCLs coupled to the waveguide collimated output Output power

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    Demonstrator for field tests

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    Demonstrator for field tests

    Ion Mobility Spectrometer

    MIRPAS-module

    MIRPAS

    Pre-concentrator

    Photoacoustic cell

    QCL array

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    Demonstrator for field tests

    Lab measurements with MIRPAS and 1st QCL array

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    Field tests, KEMEA, Athens

  • Conclusions

    www.fp7-doggies.com

    DOGGIES project aims at demonstrating: An operational movable stand-alone sensor for an efficient detection of hidden persons, drugs & explosives

    Orthogonal trace detection Mid-Infrared spectroscopy, based on photoacoustic detection (PAS) with widely tunable integrated MIR source i.e. MIRPAS

    Ion Mobility Spectrometry (IMS), with non-radioactive ionization source

    Using specific pre-concentrators and advanced software to provide reliable detection in real environments

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