Water content of the plane material by the microwave cavity resonator and measuring method null

摘要

PURPOSE:To enhance measuring accuracy while dispensing with correction, by a method wherein each constant coefficient of a predetermined characteristic equation is calculated by actual measurement using a specimen of which quantity of water and basis wt. (mass per unit area) are known, and the frequency and voltage of the microwave of a material to be measured at the max. resonance point are measured to calculate the quantity of water and the basis wt. from the aforementioned characteristic equation. CONSTITUTION:A large number of specimens each known in its quantity (x) of water and basis wt. (y) and, for each kind of the material of each specimen, the frequency (f) and voltage (v) of a microwave at the max. resonance point thereof and the data group of the quantity (x) of water and the basis wt. (y) are actually measured to determine each constant coefficient of formula I (wherein R0, F1, F2, F3, V0, V1, V2, V3... are constant coefficient and F3 and V3 are not zero identically). By measuring the frequency (f) and voltage (v) of the microwave of a material to be measured at the max. resonance point using the formula I of which constant coefficients are determined, the quantity (x) of water and the basis wt. (y) can be measured simultaneously. Even if formula II is used, a value not too deviated from an actual value can be obtained.