| 摘要 |
<p>PURPOSE:To make it possible to measure temperature distribution along the longitudinal direction of an optical fiber by arranging a piece of optical fiber along a material to be measured. CONSTITUTION:A backward-scattering-light measuring device 21 is coupled with an optical fiber 23 by way of a dummy fiber 22 which is an ordinary SM fiber. Said optical fiber 23 comprises a plurality of measuring active fibers 23a which are arranged in a discrete pattern and linking fibers 23b which are linked to the fibers 23a in series. As the fiber 23a, fiber A (Cu<1+>60ppm) is used. As the fiber 23b, plastic clad fiber wherein a core comprising quartz glass is covered with a clad comprising 300-mum silicone resin is used. The measuring device 21 is provided with the following means: a means which inputs pulse modulated signal light into the optical fiber 23; and a means which receives the output of the backward scattering light that is generated in the optical fiber 23 in a time domain and performs averaging and signal processing for differentiation. In this way, the loss distribution in the optical fiber 23 in the longitudinal direction can be measured in real time.</p> |
