METHOD AND SENSOR ELEMENT FOR DETECTING AND/OR ANALYZING COMPOUND GENERATING SIMULTANEOUSLY NUCLEAR QUADRUPOLE RESONANCE AND NUCLEAR MAGNETIC RESONANCE, OR DOUBLE NUCLEAR QUADRUPOLE RESONANCE, AND ARRANGEMENT THEREFOR.

摘要

A method for detecting a plastic explosive or the like difficult to be detected, that is, a method for detecting and/or analyzing a compound generating nuclear quadrupole resonance and nuclear magnetic resonance, or double nuclear quadruploe resonance. A magnetic field H0 is turned on to generate the magnetic resonance in a spin B together with a low-frequency magnetic field H2, the first high-frequency wave ?/2 pulse of a magnetic field H1 favorable to be impressed to a spin A under the quadrupole resonance is turned on in a spin-echo sequence at the same time, and is turned off when a detected quadrupole resonance signal echo itself of the spin A reaches the maximum intensity, i.e. when digitalization and addition for a detected signal are started. The low-frequency magnetic field H2 is kept under the ON-condition during processing therein. ON/OFF sequences for the magnetic field H0 are repeated until obtaining a proper signal-to-noise ratio for the detection and/or analysis for th e compound, after finishing the digitalization and addition for the detected signal.