HIGH-FREQUENCY INDUCTANCE TYPE APPARATUS FOR DETECTING SLIGHT MOVEMENT

摘要

A movement detecting device with a power transformer coupled to a high-frequency signal source. Supplemental windings are connected to the secondary of the power transformer and to respective coils. Two high-frequency transformers include primaries connected in respective closed loops with the supplemental windings and coils and secondaries which are coupled to a meter. The coils are wound on a common tube in which there is a movable core. The meter is part of a common leg in two further closed loops which include variable resistors or inductors and transistors.