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Multipulse sequences for explosives detection by NQR under conditions of magnetoacoustic and piezoelectric ringing

机译:在磁声和压电振铃条件下,NQR检测炸药的多脉冲序列

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摘要

A number of methods for cancelling magnetoacoustic and piezoelectric ringing signals in the spectroscopy of the nuclear quadrupole resonance are presented. The suggested methods include using the sequence (phi(0))(phi)-(tau-phi(x)-2tau-phi(y)-2tau-phi(-x)-2tau-phi(-y)-tau)(n) and a multipulse analog of the two-pulse Hahn sequence with the first pulse replaced by a short steady-state sequence. Another method presented is the method of orthogonal effective fields for a fast saturation of the quadrupole spin system which can be used for subtracting the magnetoacoustic and piezoelectric components from the signal. The suggested methods can be used for the practical purposes of detecting explosive substances and narcotics.
机译:提出了许多消除核四极共振光谱中的磁声和压电振铃信号的方法。建议的方法包括使用序列(phi(0))(phi)-(tau-phi(x)-2tau-phi(y)-2tau-phi(-x)-2tau-phi(-y)-tau) (n)和两脉冲哈恩序列的多脉冲类似物,其中第一个脉冲由短稳态序列代替。提出的另一种方法是使四极自旋系统快速饱和的正交有效场的方法,该方法可用于从信号中减去磁声和压电分量。建议的方法可用于检测爆炸性物质和麻醉品的实际目的。

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