Title (en)
Polarization enhanced two-channel NQR/NMR detection of solid and liquid explosives using multi-pulse sequences
Title (de)
Durch Polarisation verstärkte Zweikanal-NQR-/NMR-Detektion fester und flüssiger Sprengstoffe unter Verwendung von Mehrpulssequenzen
Title (fr)
Détection NQR/NMR deux canaux améliorés à polarisation d'explosifs solides et liquides utilisant des séquences à multi-impulsions
Publication
EP 1947449 A1 20080723 (EN)
Application
EP 08000923 A 20080118
Priority
SI 200700014 A 20070122
Abstract (en)
The objective of the present invention is the polarization enhanced two-channel NQR/NMR (PE NQR/NMR) detection of solid and liquid explosives
by using the multi-pulse sequences. This is a two-channel technique of detection of solid and liquid explosives, based on the polarization enhanced
nuclear quadrupole resonance (PE NQR) and proton nuclear magnetic resonance (NMR). The invention enables the detection of small amounts of
solid and liquid explosives (about 100g) in burned mines or elsewhere, containing only a very small ammount of metal (arround 0.5 g in a triggering
mechanism). The detection of solid and liquid explosives according to this invention is achieved by the use of a magnet for initial polarization of
hydrogen nuclei in a non-zero magnetic field B 0 ‰ 0, followed by the application of a fast NMR radio-frequency (RF) Carr-Purcell pulse sequence
in the NMR channel I to see whether the proton NMR spin-spin relaxation time T 2 is short (microseconds) or long (milliseconds), when in the
latter case it is highly probable that one deals with a liquid explosive, and with a solid explosive in the former case. The liquid explosive is further
characterized in the NMR channel I, and the solid explosive in the NQR channel II. In the final step of identification of a tested explosive, the data of
both channels are compared - by making use of a suitable electronic software - te with those of a data bank of all known explosives.
Inventor
• BLINC ROBERT PROF DR (SI)
• JANKO LUZNIK DR (SI)
• SELIGER JANEZ PROF DR (SI)
• TRONTELJ ZVONKO PROF DR (SI)
• TOMAZ APIH DR (SI)
• LAHAJNAR GOJMIR PROF DR (SI)
Applicant
INST STEFAN JOSEF (SI)
IPC 8 full level (invention and additional information)
G01N 24/08 (2006.01); G01R 33/44 (2006.01)
CPC (invention and additional information)
G01R 33/441 (2013.01); G01N 24/08 (2013.01); G01R 33/44 (2013.01); G01R 33/5615 (2013.01); G01N 24/081 (2013.01);
G01N 24/084 (2013.01); G01R 33/448 (2013.01); G01R 33/5605 (2013.01)
Citation (applicant)
JANKO LUZNIK ET AL. APPL. PHYSICS LETTERS vol. 89, 2006, page 123509
Citation (search report)
• [A] JP S58208664 A
• [X] BURNETT LOWELL J ET AL: "Signal processing considerations in NMR detection of liquid explosives" PROC SPIE INT SOC
OPT ENG; PROCEEDINGS OF SPIE - THE INTERNATIONAL SOCIETY FOR OPTICAL ENGINEERING 1993 PUBL BY INT
SOC FOR OPTICAL ENGINEERING, BELLINGHAM, WA, USA, vol. 1824, 16 November 1992 (1992-11-16), pages 212-222,
XP002478807
• [A] DATABASE WPI Week 200528 Thomson Scientific, London, GB; AN 2005-270793 XP002478809 -& RU 2 248 560 C2
(FEDOTOV V V) 20 March 2005 (2005-03-20)
• [A] DATABASE WPI Week 200027 Thomson Scientific, London, GB; AN 2000-315384 XP002478810 -& RU 2 128 832 C1 (UNIV
KALININ) 10 April 1999 (1999-04-10)
• [AD] LUZNIK JANKO ET AL: "Polarization enhanced "single shot" <14>N nuclear quadrupole resonance detection of trinitrotoluene
at room temperature" APPL PHYS LETT; APPLIED PHYSICS LETTERS 2006, vol. 89, no. 12, 2006, XP002478808
Cited by
CN103336311A; US2012133358A1; US8912795B2; RU2471177C1
Designated contracting state (EPC)
DE FR
Designated extension state (EPC)
AL BA MK RS
EPO simple patent family
EP 1947449 A1 20080723; SI 22459 A 20080831
INPADOC legal status
2011-02-23 [18R] REFUSED
- Effective date : 20101028
2009-05-27 [17Q] FIRST EXAMINATION REPORT
- Effective date : 20090427
2009-05-06 [17P] REQUEST FOR EXAMINATION FILED
- Effective date : 20090321
2009-05-06 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):
- Designated State(s) : DE FR
2009-04-01 [AKX] PAYMENT OF DESIGNATION FEES
2008-07-23 [AK] DESIGNATED CONTRACTING STATES:
- Kind Code of Ref Document : A1
- Designated State(s) : AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO
SE SI SK TR
2008-07-23 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO
- Countries concerned : AL BA MK RS