Device for measuring vibration of a rotating blade.

摘要

A device for use in measuring the vibration of a rotating blade of a gas turbine of like machine comprises a probe (4) including an outer casing (11) accommodated in a light-projecting optical fibre (6), a light-receiving optical fibre (7), a quartz glass lens (8) at the outlet end of the light-projecting fibre (7) and a protective glass (10) of quartz glass at the tip (5) of the probe (4). Coolant channels (12,13,14) extend through the outer casing. In use, the probe is installed on a gas turbine having a casing (3) in which an air channel (15) is defined. The tip (5) of the probe (4) is directed towards the blades (1) of the gas turbine and is situated in the flow of air through the air channel (15). <IMAGE>