公开(公告)号：US20170089741A1

公开(公告)日：2017-03-30

申请号：US15270688

申请日：2016-09-20

Applicant: MITUTOYO CORPORATION

Inventor： Chihiro TAKAHASHI ,  Toshihiro KANEMATSU

IPC: G01D18/00

CPC classification number: G01D18/00 ,  G01D5/2225 ,  G01D5/2448

Abstract: There is provided a signal processing circuit, which improves a signal SN ratio, for a measuring machine. A sensor uses two or more reference signals processed so as to have a mutual predetermined phase difference. The signal processing circuit includes a phase correcting circuit which removes an offset due to a phase shift between the two or more reference signals. The phase correcting circuit includes an offset detecting unit which adds the two or more reference signals and extracts the offset, and a correction processing unit which removes the offset from a sensor signal.