| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a detecting apparatus by which light for detection can be transmitted at a long distance by a method wherein a first optical fiber which guides random light from a random light source to a sensor unit is provided and a second optical fiber by which detection light radiated from the sensor unit is guided to a light receiving part is provided. SOLUTION: This apparatus is composed of a sensor unit 1 which is installed in a desired detection point such as a current cable, a transmission line or the like, In addition, it is composed of a high-efficiency random light source 20 which supplies light, for detection, to the sensor unit 1. In addition, it is composed of a light receiving element 3 by which a detection result from the sensor unit 1 is converted into an electric signal, In the high-efficiency random light source 20, a laser light source 2, a polarization cancellation part 5 and a third single-mode optical fiber F3 are provided. Random light which is obtained by the polarization cancellation part 5 comprises a large quantity of light. The sensor unit 1 is coupled to a first single-mode optical fiber F1. In the sensor unit 1, a polarizer 11, a magneto-optical element 12 and an analyzer 13 are provided, Light which is radiated by the analyzer 13 is guided to the light receiving element 3 via a second single-mode optical fiber F2.</p> |
