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Magnetic Resonance Apparatus For Rapid And Reliable Detection And Recognition Of A Trace Of Specific Substances

A technology of magnetic resonance and equipment, applied in the direction of magnetic resonance measurement, measurement of magnetic variables, measurement of magnetic variables, etc., can solve problems such as interference, difficult identification tasks, and destruction of magnetic medium data, etc., to promote compactness, simplify hardware and Effects of Design Considerations

Inactive Publication Date: 2014-09-17
MICRO TAG TEMED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These requirements complicate the placement of the marks / tags and the design of the detection means used to interrogate the resonant material carried by the marks / tags
Furthermore, the presence of strong external magnetic fields within the interrogating body or close to the marker can pose health hazards (for example, interference with the operation of life support devices such as pacemakers), as well as the risk of destroying data contained on the magnetic media
These deficiencies make the task of identifying credit / bank cards, or other information carriers sensitive to external magnetic fields, extremely difficult

Method used

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  • Magnetic Resonance Apparatus For Rapid And Reliable Detection And Recognition Of A Trace Of Specific Substances
  • Magnetic Resonance Apparatus For Rapid And Reliable Detection And Recognition Of A Trace Of Specific Substances
  • Magnetic Resonance Apparatus For Rapid And Reliable Detection And Recognition Of A Trace Of Specific Substances

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0097] Synthesize several grams of Mnf(W) type with T by precipitation from ferrous and manganous aqueous solutions. c =770K ferrimagnetic manganese ferrite (ferrimagnetic manganese ferrite) MnFe 2 o 4 (H.Yasuoka, A.Hirai, T.Shinjo, M.Kiyama, Y.Bando, T.Takada, J.Phys.Soc.Jap., 22(1967) 174–180), followed by pulverization into micron size (with powder with an average size of about 2 μm). A relatively large amount (-2 mg) of micron-sized Mnf(W) powder was then placed near the probe of the reader and a SCSE sequence was applied. The test is performed at room temperature. Use the following parameters for the SCSE sequence: f SE1 =510MHz,△f SE =5MHz,f IFi =-1.75MHz,n=11, =(0°,0°), =(0°,180°), =(0°,180°),P SEi1 =P SEi2 =2W,S SEi1 =S SEi2 = Gaussian distribution (Gaussian), τ p1i ,=0.8μs,τ p2i ,=1μs,τ dSEi =6μs,τ Acqi =0.5μs,τ RRi =21μs and N Acq =32000. The total test time is 10.6 seconds. For the lowest peak (at 525MHz) SE intensity, the achieved signal-to-...

example 2

[0101] Synthesized from reagent grade oxide by traditional sintering technique with T c =364K of several grams of ferromagnetic manganite (ferromagnetic manganite) La0.7Sr0.3MnO3 (LSMO) ceramics (Y-Ch.Liou, Y-R.Chen, Ceram.Intern., 34 (2008) 273–278) were then pulverized into Micron-sized (with an average size of about 2 μm) powder. Then a relatively large amount (-6 mg) of micron-sized LSMO powder was placed near the probe of the reader and the SCSE sequence was applied. The test is performed at room temperature. Use the following parameters for the 4SE sequence: f SE1 =250MHz,ΔfSE=5MHz,f IFi =1.5MHz,n= 9 , =(0°,0°), =(0°,180°), =(0°,180°),P SEi1 =P SEi2 =1.2W,S SEi1 =S SEi2 = uniform distribution (Rectangular), τ p1i ,=τ p2i ,=0.5μs,τ dSEi =4μs,τ Acqi =0.5μs,τ prei =0.2μs, M SE =128 and N Acq =1000. The total test time is 7 seconds. The achieved signal-to-noise ratio is above 8 for the peak at 270MHz. The broad-line frequency-domain curve NSE(f) obtai...

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Abstract

The invention provides a magnetic resonance apparatus for rapid and reliable detection and recognition of a trace of specific substances, and relates to detection and recognition of taggant substances having predefined zero external field magnetic resonance signatures. An object comprising taggant substance(s) is irradiated with a sequence of specific excitation pulses of electromagnetic radiation within a predetermined time and frequency scanning pattern, responsive nuclear spin echo signals are received from the object with a predetermined time and frequency acquisition pattern and data indicative thereof is generated. The scanning and acquisition patterns used permit successive transmission of pulses of multiple frequencies using a two-pulse spin-echo excitation technique, or a steady state-spin echo excitation technique, and successive acquisition of multiple nuclear spin echo response signals, within a time slot between two successive excitation pulses of a specific excitation frequency. The generated data is correlated with reference data corresponding to predetermined taggant substance(s) and one or more taggant substances are identified based on the determined correlation.

Description

technical field [0001] The present invention relates to the detection and identification of trace substances with a predefined zero external field magnetic resonance signature. Background technique [0002] Many techniques have been proposed for authenticating valuable documents (eg, banknotes), items (eg, jewelry, paintings), and the like. For example, NL 6,613,250 proposes the use of chemical tests to identify printed documents as genuine, and US Patent Nos. 4,451,521, 6,344,261 and 6,383,618 propose various lighting techniques for authenticating valuable / security documents. [0003] A magnetic resonance technique (electron paramagnetic resonance EPR, also known as electron spin resonance ESR) for authenticating or identifying valuable paper is described in US Patent No. 4,376,264, which proposes the use of ) EPR-characteristic substances detected by high-field EPR. In another approach described in US Patent No. 5,149,946, a radio frequency band ESR verification techniqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N24/12
CPCG01R33/441G01R33/44G01R33/4625
Inventor Y·罗森菲尔德A·沙慕斯D·费拉科夫A·奥夫奇尼科夫I·冈特查恩科D·凯尼
Owner MICRO TAG TEMED
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