METHODS AND APPARATUS FOR NQR TESTING

摘要

A method of imaging within a sample space an object containing quadrupolar nuclei comprises irradiating the object to excite nuclear quadrupole resonance, applying to the object a magnetic field gradient having a profile (Bo(x)) such that the square of the profile ((Bo(x))<2>) varies linearly with distance (x), detecting resonance response signals from the nuclei, and deriving an image from the response signals (see Figures 1 to 7). An analogous apparatus is also disclosed. A method of and apparatus for nuclear quadrupole resonance testing an object, and a method of and apparatus for detecting the presence of a particular substance containing a given species of quadrupolar nucleus, are also disclosed (see Figures 7 and 8).