| 摘要 |
PURPOSE:To enable a highly accurate measurement of temperature by comparing data of the intensity of phosphorescence/fluorescence with the temperature characteristic in the intensity of phosphorescence/fluorescence predetermined containing no factor pertaining to transmission loss. CONSTITUTION:A timing pulse P outputted from a pulse generation circuit 2 as controlled with a controller 1 is irradiated on a phospho/fluorescent substance 7 through a light emitter 3, an optical fiber 4, a light branch unit 5 and an optical fiber 6. The phosphorescence/fluorescence emitted from the phospho/fluorescent substance 7 and the excited light reflection from said substance 7 are sent to a detection circuit 11 through the optical fiber 6, the light branch unit 5, an optical fiber 8, a filter 9 and a photodetector 10. Then, the output B1+C of the photodetector 10 during the excitation thereof and the output B2 of the photodetector 10 following the stoppage of excitation as detected with the circuit 11 are sent to an arithmetic circuit 12 to compute the ratio B2/(B1+C) between both of outputs B1+C and B2 and the ratio is compared with the temperature characteristic of the ratio B2/(B1+C) previously memorized into a memory to determine the temperature. |
