Apparatus for measuring the velocity of low frequency vibrations

Details Apparatus for measuring the velocity of low frequency vibrations Apparatus for measuring the velocity of low frequency vibrations

1976-01-09

1977-10-04

Queisser, Richard C.

Measuring and testing

Moisture content or absorption characteristic of material

340 17R, G01V 128

Patent

active

040517187

ABSTRACT:
The invention concerns apparatus for measuring the velocity of low frequency mechanical vibrations, comprising two springs between which a vibratable mass is secured, two electric coils mechanically coupled to the mass, a permanent magnet core in each coil which is stationary relative to its associated coil, one coil being a measuring coil while the other is a feedback coil; and a current generator having a control input to which the measuring coil is connected while the feedback coil is connected to the generator output, the connection polarities being so selected as to produce negative feedback.

REFERENCES:
patent: 2390187 (1945-12-01), Sharpe
patent: 2764019 (1956-09-01), Lindholm
patent: 3863200 (1975-01-01), Miller

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