Patent ID: 6563308
Filing Date: 2003-05-13
Classification: G01B

Abstract:
An eddy current loss measuring sensor comprising:an exciting/receiving coil for receiving a high frequency current to excite a high frequency magnetic field to excite an eddy current in a conductive film which is an to be measured, and for receiving a synthetic magnetic field of a magnetic field generated by said eddy current and said high frequency magnetic field; a first magnetic permeable member inserted into said exciting/receiving coil to serve as a core, said first magnetic permeable member being formed of a first magnetic permeable material; and a second magnetic permeable member provided so as to surround said first permeable member and said exciting/receiving coil, said second magnetic permeable member being formed of a second magnetic permeable material and having a surface facing said conductive film, said surface being provided with a ring shaped opening around said first magnetic member so that only a portion of said exciting/receiving coil facing said conductive film is exposed and a remaining portion of said exciting/receiving coil facing said conductive film is covered by said second magnetic permeable member.