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51. 发明授权

US4920806A Strain gage 失效
标题翻译：应变计
公开(公告)号：US4920806A
公开(公告)日：1990-05-01
申请号：US311340
申请日：1989-02-16
申请人： Masao Obama , Masaaki Kikuchi
发明人： Masao Obama , Masaaki Kikuchi
IPC分类号： G01B7/00 , G01B7/24 , G01L1/12
CPC分类号： G01B7/24 , G01L1/125 , G01L1/127 , Y10S73/02
摘要： A strain gage includes a pair of coils printed on one face of a substrate and an amorphous magnetic metallic plate arranged on the other face of said substrate and having magnetostrictive effect. Magnetic flux generated by one of the paired coils passes through the amorphous magnetic metallic plate and links with the other of the coils. When load is added to an object and strain of the object is caused by the load added, therefore, the magnetic permeability of the amorphous magnetic metallic plate is changed, due to the magnetostrictive effect, in response to the load added. The density of the magnetic flux passing through the magnetic metallic plate is also changed responsive to this changing magnetic permeability and composite inductance of the paired coils is then changed responsive to the changing density of the magnetic flux. The strain gage outputs a detection signal, which represents the changing density of the magnetic flux, thereby measuring the load added or strain of the object caused by the load added. The detecting sensitivity of the strain gage is more remarkably enhanced as compared with that of the conventional one. Further, the strain gage has a higher reliability and can be handled with more easiness.

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