| 摘要 |
<p>Method and apparatus for the measurement of moisture or water content electrically so that, in the material to be studied, an electrical field is generated by means of the electrodes of the measurement head (1) and that the moisture or the water content is determined as the effect of the material to be studied on the electrical properties (Rm, Cm) of the measurement head (1). The objective of the invention is to avoid mechanical weighing or standardization of a sample taken out of the material to be measured, to be performed before the measurement operation proper, as well as the extra mechanical equipment required for such operations. The problem has been solved by performing the measurement so that the degree of filling of the measurement head (1) is changed and the capacitance (Cm) of the measurement head, varying along with the quantity of the material to be studied, is measured and, when the capacitance reaches a predetermined value (Ca), the resistance (Rm) of the sensing element (1) is measured, by means of which resistance the moisture of the material to be studied is determined. The invention can be applied especially to the moisture-measurement of grain, but also to the measurement of moisture of seeds, hay, soil, peat, sand, wood, chips, and sawdust, as well as for moisture measurements of various powders in production processes. The invention can also be applied to the measurement of the water content, e.g., of silage, water-containing emulsions and mixtures.</p> |
