Apparatus for measuring the velocity of mechanical low...

Details Apparatus for measuring the velocity of mechanical low... Apparatus for measuring the velocity of mechanical low...

G - Physics

01

V

349/10, 349/57.1

G01V 1/18 (2006.01) G01H 9/00 (2006.01) H04R 3/00 (2006.01)

Patent

CA 1050651

ABSTRACT OF THE DISCLOSURE 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. - 1 -

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