Demonstration of Detection of Hidden Persons and Illegal Substances with an Array of Quantum Cascade...
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Transcript of Demonstration of Detection of Hidden Persons and Illegal Substances with an Array of Quantum Cascade...
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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 spectrometry•Mature and well accepted•Compact design•High sensitivity•High selectivity
Photoacoustic spectroscopy•Extreme sensitivity•Short optical path, very small dimensions
•Short response time•High selectivity
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Compounds of interestTypical indications of human presence
•Expired air Acetone, Isoprene, Ammonia, CO2•Blood (air phase) Acetone, Isoprene, •Urine (air phase) Acetone, Various ketones•Sweat odor (E & Z)-3-methylhex-2-enoic acid (i.e.3MHA)
Typical drug precursors•a- and b-pinene (cannabis)•Safrole (MDMA/ecstasy)•Bentzhyl Methyl Ketone (amphetamine/metamphetamine)
Typical explosives and taggants•2- and 4-nitrotoluene•2,4- and 2,6-Dinitrotoluene•Butyl 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
•Gasera’s 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 QCL’s
• 32 DFB QCL’s in single chip• Integrated photonics multiplexer with SiGE/Si
and Ge/SiGe waveguides• 7.4 µm for detection of explosives and drugs• 9.1 µm 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 µm, pulsed operated QCL• 9/22 QCL’s coupled to the waveguide• collimated output• Output power << 1 mW• Integrated into the project demonstrator
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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
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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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✓
✓
✓
✓
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