MEASURING METHOD AND INSTRUMENT EMPLOYING CRYSTAL OSCILLATOR

摘要

Physical properties of an objective substance of measurement are measured exactly by measuring any one of a mass load, a viscous load and a viscoelastic load separately from other loads. The method for measuring the physical properties of a substance touching a crystal oscillator equipped with electrodes on the opposite sides of a quartz plate based on the frequency variation of the crystal oscillator, characterized in that the physical properties of the substance are measured by employing frequencies F₁ and F₂ (F₁2) giving one half of the maximum conductance in the vicinity of a resonance point by each frequency of at least two out of N-multiple waves (N=1, 3, 5, ...(N=2n+1)) of the crystal oscillator when a voltage is applied between the electrodes.