An Improvement of the Vibrometer Utilizing Inductance Change for Dispilacement Measuring

Abstract

As to the vibrometer utilizing inductance change for displacement-measuring, about which report was made previously by one of the present authors, the greatest disadvantage is the instability of oscillation in the oscillator-circuit. In order to overcome the difficulty, researches were made from various angles and it was found out that by placing all the parts of the vacuum tube oscillator in the vibrometer, the oscillation was made quite stable and also the remote measuring was made possible.