Method for species identification and quality detection of liquid-like samples based on nuclear magnetic resonance technology

A method for species identification and quality detection of liquid-like samples based on nuclear magnetic resonance technology comprising the following steps:

• step 1:
• designing a pulse sequence that includes pulse block or composite pulses containing 1H spin-echo function and pulse block or composite pulses containing a T1 filter function;
• step 2:
• applying the pulse sequence to the targeted liquid-like samples to obtain their 1H two-dimensional relaxation signals;
• step 3:
• converting the obtained 1H two-dimensional relaxation signals into a fingerprint spectra of the liquid-like samples, to be used for species identification and quality detection of liquid-like samples by obtaining fn(x,y) by normalizing the signal intensity of a two-dimensional relaxation signal f(x,y) and subtracting reference function F(x,y) from fm(x,y), wherein the reference function F(x,y) is obtained from the 1H relaxation properties of the sample, or from a surface fitting of fn(x,y), or averaging Fm(x, y), m=1, 2, . . . , i, which is acquired from surface fitting of the multiple two-dimensional relaxation signals.