| 摘要 |
PURPOSE:To measure easily a tip clearance of blade by providing an operating device which emits two beams inclined mutually toward the tip of blade of a rotor, measures a time interval between signals of a reflected light from the tip, and calculates the tip clearance basing on its measured value. CONSTITUTION:When a light is emitted from light sources 5, 6, two beams S1, S2 are irradiated continuously onto the circumference through which a blade 2 passes, in a state inclined by a lens 19 of an optical probe 7, through optical fibers 16, 17, respectively, and when the blade 2 moves and comes, the beam S1 from the optical fiber 16 irradiates the end of the blade 2, and when the blade 2 further moves, the beam S2 from the optical fiber 17 irradiates the end of the blade 2, and both of them are reflected to the lens 19. Subsequently, the beams S1, S2 become parallel beams by the lens 19, are led to an optical filter 10 by an optical fiber 18, sent to each photoelectric converting device 11, and in this device, the respective signals are converted to electrical signals, also a pulsative signal is made by each waveform shaping device 12, and its signal is sent to a signal processing device 13. |
