| 摘要 |
<p>PURPOSE:To obtain the title sensor capable of measuring the intensity of a magnetic field over a range from a low magnetic field to a high magnetic field with high accuracy. CONSTITUTION:Two linearly polarized lights having different wavelengths are guided to magnetic optical elements 22 different in Verdet constant according to a wavelength along the direction of a magnetic field to be measured. The planes of polarization of the lights passing through the elements 22 are rotated corresponding to the wavelengths of said lights by wavelength magnetic optical effect. Two lights emitted from the magnetic optical elements 22 are guided to an analyzer 23 permitting the linearly polarized lights to transmit in a specific direction and the intensities of the lights transmitted through said analyzer are respectively detected by photodetectors 28a, 28b. On the basis of the detected values, the signal based on the light having a wavelength large in Verdet constant is used in a low magnetic field intensity range and the signal based on the light low in Verdet constant is used in a high magnetic field intensity range.</p> |
