| 摘要 |
<p>PURPOSE:To measure even a long distance with high accuracy by removing the measurement error of the temperature distribution resulting from the mixture of the Rayleigh scattering light into a measuring light. CONSTITUTION:Optical pulses are put into a sensor optical fiber 20 from a light source 1 in a measuring apparatus 10. The back scattering light generated in the optical fiber is guided to photodetectors of measuring systems 30a, 30s in the measuring apparatus. The temperature of the optical fiber 20 is obtained from the intensity of the back scattering light, and the position where the back scattering light is generated is obtained from the difference of the time when the optical pulses enter the optical fiber and when the back scattering light reaches the measuring systems 30a, 30s. Accordingly, both the temperature and the position can be measured concurrently in this temperature distribution measuring apparatus for measuring the temperature distribution of an optical fiber. A temperature distribution operator having a function of converting a value obtained by subtracting Ir(x) which is a function of the distance from the intensity I(x) of the received light corresponding to the distance (x) to the temperature is provided in this apparatus.</p> |
