| 摘要 |
PURPOSE:To enable the measurement of a change in weight in a short time, by driving a piezoelectric vibrator to vibrate intermittently and by measuring vibrations. CONSTITUTION:On the occasion when a piezoelectric vibrator is driven to vibrate, it is driven in a manner of intermittent vibration wherein a cycle of vibration and stop of vibration is repeated so that a vibration time width is within 0.1-100sec and that a vibration stop time width subsequent thereto is 10 times as long as or longer than the vibration time width. In the case when a quartz vibrator of AT-Cut of 14mmphi and 6MHz is made to vibrate at the temperature of 400 deg.C near 573 deg.C of an alpha-beta transformation point, for instance, temperature control is conducted with the precision of 0.1 deg.C and an intermittent vibration method of 5sec drive and 5min stop is adopted, and thereby a measured value having reproducibility for a change in temperature is obtained.
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