| 摘要 |
<p>PURPOSE:To enable an accurate temperature distribution to be measured by providing an optic fiber in a regular shape along a peripheral surface of a body to be measured. CONSTITUTION:An optic fiber 10 is wound for a cylindrical pipe 1 at a constant pitch l. A semiconductor laser 11 and a light-receiving element 12 are provided at one edge side of this optic fiber 10 and the element 12 is connected to a signal processing device 13. Then, an upper part a of the pipe 1 is at a high temperature and the lower part is at a low temperature. And then, a pulse laser light 14 which is emitted from the laser 11 enters the optic fiber 10 and propagates the inside. At that time, Raman scattering light is generated within the optic fiber 10 and a rear scattering light out of this Raman scattering light moves toward an incidence side to the optic fiber 10. In this case, strength of the rear scattering light depends on temperature and the rear scattering light is received by the element 12, is converted photoelectrically, and is sent to the device 13. In this device 13, temperature distribution can be obtained from a time-sequence signal of the rear scattering light. The optic fiber 10 is wound around a pipe 1 at a pitch l, an accurate temperature distribution can be obtained.</p> |
