| 摘要 |
PURPOSE:To improve response by preventing external influence of a noise, etc., by arranging several detection parts different in information receptive capacity on photo transmitters parallel to a photo transmission line, in an information detection system for light leakage detection of the photo transmission line. CONSTITUTION:Beltlike area L between initial part 2 and terminal part 3 of photo transmission line 1 is divided into detection sections l1 to ln, in parallel to which photo transmitter 4 is arranged, and detection parts 71 to 7n are provided corresponding to detection sections. At one termianal of photo transmitter 4, light sending part 5 is provided and at the other terminal, light level detector 6 is provided. Detection parts 71 to 7n can detect the leakage of light and are composed of detachable termanals 8a and 8b of photo transmitter 4, convex lenses 9a and 9b placed at a focal distance, cylinder 10 convering the both and intake hole 11a and outlet hole 11b where leaked light pass; their information receptible capacities differ mutually and intergral values of random combinations are unequal. |
