| 摘要 |
PURPOSE:To enable to use the detector for a hazardous area, by leading the light from the 1st optical conductive fiber to the 2nd optical conductive fiber by spreading it with a member distorted with the shape through thermal expansion phenomenon, and measuring the temperature of member through this passing light amount. CONSTITUTION:At the center of a hazardous area, a light source 11, photodetecting element 15 and a measuring section measuring the temperature from the output of the photodetector 15 are located. At the site of this hazardous area, a measuring detection section 13 is located, and the light source 11 and the input of the section 13 are optically coupled with the 1st optical conductive fiber 12 and the photodetector 15 and the output of the section 13 are optically coupled with the 2nd optical conductive fiber 14. Thus, the light of the light source 11 is fed in the order of the 1st optical conductive fiber 12, measuring detection section 13, 2nd optical conductive fiber 14 and photodetector 15, it is converted into an electric signal, which is measured at a measuring section 16 as the temperature value of the section 13. |
