公开(公告)号：US4051718A

公开(公告)日：1977-10-04

申请号：US647807

申请日：1976-01-09

申请人： Ferenc Meckl ,  Peter Piuk

发明人： Ferenc Meckl ,  Peter Piuk

IPC分类号： G01H5/00 ,  G01V1/28

CPC分类号： G01H5/00

摘要： 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.