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FRANCAIS
DEUTSCH
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Illicit Substance Detection with NQR
Close-in remote detection of explosives and narcotics
for military and civilian applications (Improvised Explosive Devices (IEDs), customs, police departments, etc.)
Purpose
- Detection of chemical elements having a quadrupole moment (14N, 35,37Cl, etc.)
- Radiofrequency (RF) spectroscopy in the 500 kHz–40 MHz range
- Applicable ~to solid-state compounds
Skills
- Development of unique numerical simulation tools for:
- building arbitrary target shapes and antenna geometries
- computing signal with one-pulse sequences, echo sequences, crosspolarization, etc.
- signals post-processing
- …
- Development of NQR spectrometers:
- Digitally controlled synthesizer and sequencer
- RF stage design
- Dedicated antennas
- Embedded data acquisition and processing
- Remote console with TCPIP
- …
19 ‘’ rack, 6 U height NQR spectrometer
Concepts
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Portal-like architecture for mail, baggage screening
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Single-side detection for landmines, IEDs
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Nondestructive chemical analysis, polymorph determination
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Experimental and simulated free induction decay (FID) of a few g of NaNO2
Spin-lock spin-echo (SLSE) technique for TNT
Steady-state
free precession
(SSFP) technique
for RDX |
Signal processing
by numerical
spectral analysis
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 Coil concepts |
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