Patent ID: 8947072
Filing Date: 2015-02-03
Classification: G01R

Abstract:
1. An apparatus of detecting a value of current flowing in a conductor, comprising: a current detection head to be fixed to the conductor; a base plate; and an optical fiber extending between the current detection head and the base plate; wherein, one end portion of the optical fiber, a lens, a magneto-optical element are fixed to the current detection head, a penetrating hole is formed in the base plate, the other end portion of the optical fiber is inserted into the penetrating hole of the base plate and fixed, a light source which causes polarized light to be incident on the other end portion of the optical fiber, and a light-receiving device which outputs an electrical signal corresponding to an angle of rotation of the polarized light emitted from the other end portion of the optical fiber, are disposed on the base plate, and an optical system is formed within the current detection head such that light from the optical fiber is guided through the lens to the magneto-optical element, and light affected by a magneto-optical effect due to the magneto-optical element is guided to the optical fiber through the lens.