| 摘要 |
<p>PURPOSE:To obtain an optical current measuring instrument having high accuracy by using an aspherical lens as a lens for condensing a light beam which is passed through a Faraday effect material and leading it to an optical fiber, among lenses which are installed in an optical head. CONSTITUTION:Light beams from a first, a second and a third light emitting elements are irradiated from end faces of optical fibers 15a, 15b and 15c, allowed to pass through lenses 13a, 13b and 13c and polarizers 12a, 12b and 12c, become direct polarization wave parallel light beams 16a, 16b and 16c, and they become one piece of composite light beam 16g. It is made incident on a Faraday effect material, and a light beam 16k which is emitted from the Faraday effect material again is detected by an analyzer 12e, condensed to an end face of a light receiving use optical fiber 19 by a light receiving lens 17 and it is inputted. By using an spherical lens as this light receiving lens 17, an optical current transformer having high accuracy which is strong against vibration and a temperature variation can be obtained.</p> |
