Invention Grant
- Patent Title: Magneto-optic remote sensor for angular rotation, linear displacements, and evaluation of surface deformations
- Patent Title (中): 用于角旋转,线性位移和表面变形评估的磁光遥感器
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Application No.: US11459157Application Date: 2006-07-21
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Publication No.: US07365533B2Publication Date: 2008-04-29
- Inventor: Seong-Jae Lee , Sang-Hoon Song , Yevgen Melikhov , Choon-Mahn Park , Hans Hauser , David Jiles
- Applicant: Seong-Jae Lee , Sang-Hoon Song , Yevgen Melikhov , Choon-Mahn Park , Hans Hauser , David Jiles
- Applicant Address: US IA Ames
- Assignee: Iowa State University Research Foundation, Inc.
- Current Assignee: Iowa State University Research Foundation, Inc.
- Current Assignee Address: US IA Ames
- Agency: Reinhart Boerner Van Deuren P.C.
- Main IPC: G01R33/032
- IPC: G01R33/032 ; G02F1/09

Abstract:
A system and method to detect angular rotation, linear displacement and/or surface deformations is presented. The method is based on the ability of a linear polarized light to interact with magnetic materials and to change its polarization angle due to Faraday effect. A basic structure of the system consists of a magneto-optic (MO) film with a two-domain structure and a single domain wall which are generated by gradient magnetic field produced by opposite polarity permanent magnets placed near the film. An AC magnetic field applied perpendicular to the MO film surface causes the magnetic domain wall in the MO film to oscillate at the same frequency. This leads to a detected output AC modulated signal. By measuring the temporal changes in this signal, information on angular rotation, linear displacement and/or surface deformation can be obtained.
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