The present invention relates to a kind of samples of nuclear spin Relaxation Method measurement longitudinal relaxation performance nuclear spin,Include the following steps: the nuclear spin for exposing the samples to the saturated polarization of static polarization magnetic field,Wherein polarization magnetic field has the magnetic field of a polarizing field strength and predetermined polarisation direction( 106 ),Change polarizing field strength and evolution field strength by exposing the samples to static evolution magnetic field,Wherein sample is exposed to the field strength preassigned time cycle evolved and developed( 102 ),Wherein magnetic field Evolution Development has a pre-specified magnetic field( 108 ),Wherein the evolution field strength is less than polarizing field strength and magnetic field evolution direction( 108 )Different from the direction of polarization magnetic field( 106 ),It exposes the samples to static detection magnetic field and measures the nuclear spin of polarization sample,There is the direction of a detection field strength and scheduled detection magnetic field in the detection magnetic field,Wherein,Detecting field is powerful in evolution field strength, and the evolution different periods for repeating abovementioned steps determine the differentiation of longitudinal relaxation performance and nuclear spin, from the different evolutionary periods of the function of the polarizing field strength of measurement.
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