When the measurement is performed on porous materials, it is relevant to correlate the NMR signal intensity to the moisture content. Poli et al. [17] suggest to compare the gravimetrically determined moisture content of numerous samples against the integrated NMR signal intensity and to build up a calibration curve. In addition, T2 depend on the degree of confinement of water within the porous structure: water in small pores relaxes rapidly, whereas water in large pores relaxes mores slowly (T2依赖于孔结构中水的受限程度;小孔水弛豫快;大孔水弛豫慢).