| 摘要 |
PURPOSE:To enable detecting the deterioration of a characteristic element with high accuracy, by setting up the intermediate part of a plastic optical fiber to a side face of the characteristic element heat transferable manner and performing arithmetic operation of the difference or ratio of the electric signals corresponding to incident light and that corresponding to emitting light. CONSTITUTION:Detecting means 20 is constituted with a optical oscillator 21, a photodetector 22, a microprocessor 23, and cables 24. The light with a specified wavelength produced by the optical oscillator 21, is made to be incident upon one end of a plastic optical fiber 18, and is subjected to photoelectric conversion at the same time, to input the electric signal corresponding to the incident light into the microprocessor 23 through the cable 24. The light transmitted through the plastic optical fiber 18 is emitted from the other end, and is inputted into the microprocessor 23 after being photoelectrically converted by the photodetector 22. If the ratio of the electric signal corresponding to the incident light to the electric signal corresponding to the emitting light, calculated by the microprocessor 23, reaches a preset value, the deterioration of the characteristic element 4 may be detected. |
