JPS6488220A - Polarization measuring apparatus - Google Patents

Abstract

PURPOSE:To achieve the simplification, miniaturization and wt. reduction of constitution and to automatically measure an angle with high accuracy, by calculating the angle of the polarized beam incident to each polarizing plate formed with respect to a vibration surface on the basis of the detection output of the intensity of light passing each polarizing surface of multi-split polarizing plates mutually different in a polarizing direction. CONSTITUTION:When polarized beam being an object to be measured is allowed to be incident to a three-split polarizing plate 10, the intensities of the beam passing through the first-third polarizing plates 11-13 are respectively detected by the first-third beam intensity detectors 21-23. The respective detection signals are processed by amplifiers 31-33 and A/D converters 41-43 to be inputted to an operational control part 50. Herein, predetermined simultaneous equations are solved to display the angle of the polarizing beam incident to the polarizing plate 10 formed with respect to a vibration surface on a display part 60. By this method, this apparatus can be simply constituted of the beam intensity detector group 20, the amplifiers 31-33, the A/D converters 41-43, the control part 50 and the display part 60 in a small size. Since the transmitted beam from the polarizing plate 10 is detected by the detector group 20 and operated by a microcomputer, the enhancement of measuring accuracy can be achieved.