FIELD: measurement engineering.
SUBSTANCE: tested sample is saturated by proton-containing fluid and sample is subject to pulse gradient of magnetic field. Amplitudes of signals of spin echo from proton-containing fluid in tested sample are measured without influence and after influence of mentioned pulse gradient of magnetic field. Current coefficient of diffusion attenuation is determined from the data described. Influence of pulse gradient of magnetic field onto tested sample is performed step by step by using definite value of magnetic field pulse gradient for any step. Mentioned step-by-step influence is carried out according to increasing and decreasing law till getting diffusion attenuation coefficient in tested sample correspondingly being close to zero value or being close to unit. All the operations described are to be repeated for reference sample wit known cumulative porosity-metering curve. Then equal meanings of diffusion attenuation coefficient values and values of relative occurrence at mentioned porosity-metering curve are compared for reference sample. Correspondence of value of magnetic field pulse gradient is found for reference sample at which value of gradient the diffusion attenuation coefficient was found and current diameter of porous of reference sample. According to found correspondence, calibration graph relating value of magnetic field pulse gradient and current diameter is drawn for reference sample. When using meaning of value of magnetic field pulse gradients at any steps in reference sample and mentioned calibration drawing. Current diameters of pores in tested object are found. Then porosity-measuring curve is drawn for tested object in "diffusion attenuation coefficient - current diameter of pores" coordinates which curve is used for determining porous characteristics of porosity of tested object.
EFFECT: widened functional capabilities; improved precision of evaluation of pores' sizes; simplification.
2 cl, 1 tbl, 3 dwg
