CA2113558A1 - Detection of Explosive and Narcotics by Low Power Large Sample Volume Nuclear Quadrupole Resonance (NQR) - Google Patents
Detection of Explosive and Narcotics by Low Power Large Sample Volume Nuclear Quadrupole Resonance (NQR)Info
- Publication number
- CA2113558A1 CA2113558A1 CA 2113558 CA2113558A CA2113558A1 CA 2113558 A1 CA2113558 A1 CA 2113558A1 CA 2113558 CA2113558 CA 2113558 CA 2113558 A CA2113558 A CA 2113558A CA 2113558 A1 CA2113558 A1 CA 2113558A1
- Authority
- CA
- Canada
- Prior art keywords
- nqr
- narcotics
- quadrupole resonance
- nuclear quadrupole
- explosive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003876 NQR spectroscopy Methods 0.000 title abstract 4
- 239000002360 explosive Substances 0.000 title abstract 2
- 239000004081 narcotic agent Substances 0.000 title abstract 2
- 238000001514 detection method Methods 0.000 title 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- 238000011896 sensitive detection Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/441—Nuclear Quadrupole Resonance [NQR] Spectroscopy and Imaging
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- High Energy & Nuclear Physics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The sensitive detection of explosives and narcotics by nuclear quadrupole resonance (NQR) is performed at low rf power by assuring that the rf field strength is larger than the local magnetic field. Additionally, it has been recognized that signal-to-noise ratio of a signal induced by a specimen of fixed size decrease by only the square root of the coil size. Thus, rather than scaling power linearly with coil size, as conventionally done to maintain the same rf field intensity, the power needs only be increased by the square root of the increased coil size to assure maintenance of the same signal to noise ratio. This technique permits the use of larger coils than previously used. The invention is useful for both volume coils and surface coils.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US730,722 | 1976-10-08 | ||
| US07/730,722 US5233300A (en) | 1991-05-23 | 1991-07-16 | Detection of explosive and narcotics by low power large sample volume nuclear quadrupole resonance (NQR) |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2113558A1 true CA2113558A1 (en) | 1993-02-04 |
| CA2113558C CA2113558C (en) | 1999-03-23 |
Family
ID=24936568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2113558 Expired - Lifetime CA2113558C (en) | 1991-07-16 | 1992-04-24 | Detection of explosive and narcotics by low power large sample volume nuclear quadrupole resonance (nqr) |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0746774A1 (en) |
| JP (1) | JP2002509601A (en) |
| CA (1) | CA2113558C (en) |
| WO (1) | WO1993002365A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9319875D0 (en) * | 1993-09-27 | 1994-03-09 | British Tech Group | Apparatus for and methods of nuclear resonance testing |
| US5608321A (en) * | 1995-12-28 | 1997-03-04 | The United States Of America As Represented By The Secretary Of The Navy | Method and apparatus for detecting target species having quadropolar muclei by stochastic nuclear quadrupole resonance |
| WO2011093429A1 (en) * | 2010-01-29 | 2011-08-04 | 財団法人北九州産業学術推進機構 | Method for manufacturing highly sensitive atmosphere sensor, highly sensitive atmosphere sensor, and method for sensing substance using the highly sensitive atmosphere sensor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4166972A (en) * | 1977-10-05 | 1979-09-04 | Southwest Research Institute | NMR discrimination apparatus and method therefor |
| US4296378A (en) * | 1979-04-05 | 1981-10-20 | Southwest Research Institute | Apparatus providing enhanced detection of specimens in inhomogeneous fields |
| US4514691A (en) * | 1983-04-15 | 1985-04-30 | Southwest Research Institute | Baggage inspection apparatus and method for determining presences of explosives |
| GB8701695D0 (en) * | 1987-01-27 | 1987-03-04 | Smith J A S | Detecting compounds |
| WO1990004169A1 (en) * | 1988-10-07 | 1990-04-19 | Hitachi, Ltd. | Method and apparatus for detecting particular substance |
-
1992
- 1992-04-24 JP JP50276593A patent/JP2002509601A/en active Pending
- 1992-04-24 WO PCT/US1992/003117 patent/WO1993002365A1/en not_active Application Discontinuation
- 1992-04-24 CA CA 2113558 patent/CA2113558C/en not_active Expired - Lifetime
- 1992-04-24 EP EP92916035A patent/EP0746774A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP0746774A1 (en) | 1996-12-11 |
| JP2002509601A (en) | 2002-03-26 |
| EP0746774A4 (en) | 1994-03-30 |
| CA2113558C (en) | 1999-03-23 |
| WO1993002365A1 (en) | 1993-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |