| 摘要 |
<p>PURPOSE:To make it possible to measure a current with high accuracy and high sensitivity by elongating the length of a light path, by arranging a plurality of Faraday effect glasses in a vortex pattern while successively passing polarized light through said glasses. CONSTITUTION:A part of light emitted from a light source is propagated through an optical fiber and condensed by a condensing lens to be linearily polarized by a polarizer while the polarized light is made incident to Faraday effect glass. The Faraday effect glass has a primary conductor 12 pierced through the central part thereof and first Faraday effect glass 5 and second Faraday effect glasses 13-16 are arranged in adjacent relationship in a vortex pattern. The linearily polarized light incident from an incident surface (a) is successively subjected to total reflection fourteen times at reflective surfaces and thereafter emitted from an emitting surface (P) to be received by a light receiving part through an analyzer, the condensing lens and the optical fiber. By this mechanism, the rotary angle of a polarizing surface due to Faraday effect becomes large and sensitivity to a current to be measured can be enhanced.</p> |
