| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical probe reducing a thermal effect given to working gas.SOLUTION: This optical probe is for measuring the vibration of a turbine blade by detecting reflected light of a laser beam projected toward a turbine impeller 3. This optical probe includes: an optical fiber cable 51 put through a turbine housing 1b, disposed opposite to an end face 3a of the turbine impeller 3, and equipped with a light projector for projecting the laser beam and a light receiver for receiving the reflected light; a block 60 for probe cooling equipped with a through path 60a interiorly for putting the fiber cable 51 therethrough and supporting the fiber cables 51 by closing the through path 60a in the other end 60B extending from one end 60A to the outside of the turbine housing 1b with the one end 60A fixed to the turbine housing 1b; and a cooler 70 for cooling only a specific portion P of the block 60 on the outside of the turbine housing 1b. |
