Production method of sensor head of photoelectric type electric current sensor

摘要

Optical type electric current or the magnetic field sensor, the first phase difference part (13), the second phase difference part and the sensor fiber (15) has the sensor head which it possesses. Two phase difference parts (13), the sensor part (15) we are connected by the end which faces optically, the phase difference part (13) at least one rank phase angle angle (just 0) has slipped from the 90. The light wave which the linearly polarized light is done (3) the first phase difference part (13) is input is connected, at that time the light wave which the linearly polarized light is done (3) the polarized light axis (y'), the first phase difference part (13) the principal axis (y) with, angle (just 0) forms the angle which slips from the 45. Angle is selected, depending on angle at least. With the selection of angle , it appears because of angle 0, the direct measurement signal and offset of the non-linearity in electric current or the magnetic field where it measures between becomes possible.