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TECNICHE INFRAROSSO PER LA DETEZIONE DIIED E PRECURSORI

quila ITALY -cre Sandro Mengalieoit@

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gConsorzio CREO

Roma, Presentazione BO.NAS18/05/2011

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CREOVapour phase InfraRed Absorption Spectroscopy(Vapour Phase IRAS)

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- Spectra reflect the chemical structure of molecules → IRAS provides identification capacity7 Loc. B

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- Spectra of most compounds are available from commercial databases → IRAS allows to simulate performance and select best spectral windows; or to upgrade database and widen chemical spreadto –

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to upgrade database and widen chemical spread

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CREOThe CANARIO sensor(EDA project supported by Italian and Spanish MoDs)

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-Point sensor-Provides early warning in the presence of toxic vapours

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-Very wide chemical spread (400 spectra in the DB: CWAs, TICs, VOCs,..)-Excellent identification ability

LoI ~ 1÷50 ppm (depending on absorption coefficients)to –67100 L’A

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- LoI ~ 1÷50 ppm (depending on absorption coefficients)

quila ITALY -creeoit@

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10 mm

10 mm

The CANARIO sensor. Size 35 x 25 x 15 cm; thermal source @1000 K;

Hybrid detector array and filters. 42 spectral channels to span the regions 3-5

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15 cm; thermal source @1000 K; open cell with optical path 1.5 m.

spectral channels to span the regions 3 5 and 7-14 µm.

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CREOCANARIO: results

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Absorption spectra of 4 VOCs from7 Loc. B

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of 4 VOCs from high resolution DB

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Experimental spectra of the 4 VOCs measured by the CANARIOthe CANARIO sensor

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Similar results can be expected for Acetone, Nitromethane, Hydrogen Peroxide…

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CREOHow to deal with traces..

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Increase optical power Decrease active volume20 ng TNT/ 1 l7 Loc. B

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20 ng TNT/ 1 l = 2 ppb (v)

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Standard gas cells: V ~ 1l

quila ITALY -cre

Thermal: in band IR power ~ 10 µW

20 ng TNT/10 µleoit@tin.it

= 200 ppm (v)

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QCL laser: CW IR power 100s mW IR hollow fibers (left) : V ~ 10µl ;QTF (right): V < 1µl

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CREOThe DIRAC sensor(project supported by EC FP7)

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(P j t f d th d t ti f illi it d th ld b il

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(Project focused on the detection of illicit drugs; the sensor could be easily readapted to deal with IEDs)

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CREODIRAC: hand-portable sensor

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Grid or Battery poweredquila ITALY -

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Commercial DAQ boardDIRAC System

A/D signals USB

Commercial DAQ board

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CREOBONAS: The QEPAS sensor(Quartz Enhanced Photo Acoustic Spectroscopy)

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Principle of Operation: An InfraRed laser beam is focused between the prongs of a QuartzTuning Fork QTF. The laser amplitude is modulated at the QTF resonant frequency. Anacoustic wave is generated when the laser wavelength matches roto vibrational transitions of7 Loc. B

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acoustic wave is generated when the laser wavelength matches roto-vibrational transitions ofgas molecules that are present between the prongs. The photo-acoustic signal is proportionalto the concentration of the gas and to the laser power.

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Features: High sensitivity, comparable to conventional PAS systems; very compact, robustand cost-effective design; detects and quantifies traces in extremely small gas samples (fewcubic millimeters); immune to ambient acoustic noise.

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CREOUse of the QEPAS sensor in BONAS

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- Point sensor mounted on board of a vehicle, for the detection/identification of traces of precursors in the air (acetone, hydrogen peroxide, …)7 Loc. B

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- Point sensor coupled to a particle sampling and vaporizing unit, for the detection/identification of explosives

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CREONext step: detection of traces in the condensed phase?Stand off detection?

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Possible solution 1- Active IR imaging (ex. Fraunhofer IAF and IPM): backscattered light (same wl of the source) is depleted at resonant wl(absorption peak of trace compound). Successful id. of 20 µg TNT @ 5 m 7 Loc. B

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(abso pt o pea o t ace co pou d) Success u d o 0 µg @ 5reported.

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CREONext step: detection of traces in the condensed phase?Stand off detection?

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Possible solution 2- IR Photothermal Imaging (ex. Naval Research Lab): at resonant wavelength, incoming radiation heats up the sample; change of temperature is observed radiometrically at different wavelength. Successful 7 Loc. B

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te pe atu e s obse ed ad o et ca y at d e e t a e e gt Success uid. of 100 ng TNT @ 4 m reported.

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