Patent ID: 9642553
Date: 2017-05-09
CPC Classifications: A61B

Claim:
1. A magnetic field measuring apparatus comprising: a housing that has a first surface and a second surface orthogonal to the first surface; a first cell array that includes a plurality of first cells being arranged in a first matrix form; a second cell array that includes a plurality of second cells being arranged in a second matrix form, wherein the first cells and the second cells are different in size; a substance that is enclosed inside each of the plurality of first cells and each of the plurality of second cells, wherein the substance rotates a polarization plane of a given light according to an intensity of a magnetic field; an irradiator to irradiate a light to the detection surface of each of the first cells and each of the second cells; and a detector to detect a rotation angle of the polarization plane of the light irradiated by the irradiator and passing through each of the first cells and each of the second cells, wherein: the first cell array is arranged along the first surface and the second cell array is arranged along the second surface, the first cells of the first cell array are arranged at a higher density in the first matrix form than the second cells of the second cell array are arranged in the second matrix form, and a distance between the first cell array and a measurement object is smaller than a distance between the second cell array and the measurement object.