| 摘要 |
PURPOSE:To measure the elongation strain of a material to be measured highly accurately, by measuring the light transmission loss of a light signal, which is propagated in optical fiber. CONSTITUTION:An optical fiber 12, which is to become a strain sensor and twisted, is provided along a material to be measured 11. The material to be measured 11 is a communications cable. The optical fiber 12 is the optical fiber, which is used in said communications cable. One end of the optical fiber 12 is connected to an optical pulse testing device 13. The output of the optical pulse testing device 13 is connected to a data processing device 14. The output of the data processing device 14 is outputted to an output device 15. The optical pulse testing device 13 sends an optical pulse signal to a piece of optical fiber in the optical fiber 12. The backward scattered light yielded in the optical fiber by the optical pulse signal if received, and the distribution of the light intensity is observed on a time axis. |
