| 摘要 |
PURPOSE:To obtain a highly accurate degree-of-polarization measuring apparatus capable of easily calculating a degree of polarization at a high speed, by rotating the polarization plane of a Faraday rotor and calculating the degree of polarization from the max. and min. receiving quantities of light to be measured at this time. CONSTITUTION:When light Q to be measured is projected on a Faraday rotor 12 and passes through the Faraday rotor 12 and a detector 10 to be incident to a light detector 11, the detector 11 outputs the light receiving quantity detection signal proportional to the receiving quantity of light. At this time, an exciting part 14 sends out an exciting control signal rotating the polarization plane of the rotor 12 within a range of 0-360 deg. to a magnetic field generator 13. By this method, the polarization plane of the rotor 13 rotates from 0-360 deg.. During the rotation of said polarization plane, a quantity-of-light judge part 15 receives the light receiving quantity detection signal from the detector 11 to judge the max. receiving quantity Imax of light and the min. receiving quantity Imin of light and sends out both receiving quantities of light to a degree-of-polarization output part 16. The output part 16 calculates a degree of polarization by the operation of said receiving quantities of light to send out the same to a display means.
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