편광 빛살 가르게를 이용한 광섬유 사냑 간섭계 Optical fiber Sagnac interferometer using a polarizing beam splitter

판매 대리인 : 기율특허

전화번호 : 02-782-1004

메일주소 : kiyul@kiyul.co.kr

영문 원어  : The present invention relates to an improved Sagnac interferometer. The Sagnac interferometer comprises: a light source; a sensing unit which divides light inputted from the light source into a first beam and a second beam vertically polarized with respect to each other, moves the first beam and the second beam in the opposite directions in one closed path, re-synthesizes the same, and outputs the same; and a demodulation unit which measures a phase change induced between the first beam and the second beam by interfering the first beam and the second beam outputted from the sensing unit. The sensing unit comprises: a polarizing beam splitter configured to divide light inputted from the light source into a first beam and a second beam vertically polarized with respect to each other to output the first beam and the second beam to different output ports, respectively; and a polarization-maintaining optical fiber coil configured to convert directions of the first beam and the second beam outputted from the polarizing light splitter move the first beam and the second beam in the opposite directions, input the first beam to an output port of the second beam, and input the second beam to an output port of the first beam. The first beam and the second beam outputted from the polarization-maintaining optical fiber coil are vertically polarized with respect to each other to be combined in a polarizing beam splitter, and are outputted to the same path to be provided to the demodulation unit. The Sagnac interferometer detects and provides a rotational angular velocity by using a phase difference between the first beam and the second beam.