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WITHDRAWAL OF IMPACT ACTIVE SURVEYS AND TEMPERATURE FOR DETECTION OF SPRING MATERIALS BY CENTRAL QUADRUPOL RESOURCE
WITHDRAWAL OF IMPACT ACTIVE SURVEYS AND TEMPERATURE FOR DETECTION OF SPRING MATERIALS BY CENTRAL QUADRUPOL RESOURCE
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机译:撤除有效活性调查和温度以利用中央四方共聚物资源检测弹簧材料
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摘要
The invention relates to a method for detecting a substance selected from the group consisting of explosives and narcotics, in a specimen by nuclear quadrupole resonance. The method comprises the steps of: (a) generating a steady state free precession pulse sequence having a predetermined frequency; (b) transmitting said steady state free precession pulse sequence to a coil; (c) irradiating the specimen in response to said steady state free precession pulse sequence transmitted to said coil at said step (b); (d) detecting a total nuclear quadrupole resonance signal in response to irradiating the specimen at said step (c); (e) receiving said total nuclear quadrupole resonance signal detected at said step (d); (f) repeating step (a) through (e) at a second frequency sufficiently off resonance from the nuclear quadrupolar resonance signal of a nucleus detectable at said first frequency that no nuclear quadrupolar resonance signal for said nucleus occurs at said second frequency; g) subtracting the total nuclear quadrupolar resonance signal obtained in step (f) from the total nuclear quadrupolar resonance signal obtained in step (e).
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