Light-applied magnetic field sensor

Abstract

Abstract PURPOSE:To improve the sensitivity of the sensor by using a ZnSe polycrystalline body as a Faraday effect element. CONSTITUTION:Light incident from a light emitting element through an optical fiber 9a, optical connector 8a, and lens 7a is guided to a polarizer 1, which determines its polarization direction; and the Faraday effect element 5' imposes in proportion to the intensity of an applied magnetic field H. Then, the light from a total reflecting mirror 2 is passed through an analyzer 3, transmitted through a lens 7b, optical connector 8b, and optical fiber 9b, and converted photoelectrically by a photodetecting element to detect the intensity of the applied magnetic field H. At this time, the ZnSe polycrystalline body used as the Faraday effect element 5' has a large Verdet constant as compared with Bi12SiO20 single crystal and lead glass and is made longer in element length than ZnSe single crystal, so the degree of modulation is increased and the sensor sensitivity is improved greatly.

Inventors

• 👤 Toshiharu Miyamoto
• 👤 俊治 宮本

Bibliographic Details