Steam turbine and method of measuring the vibration of a moving blade in a flow passage of a steam turbine

摘要

Steam turbine and method of measuring the vibration of a moving blade in a flow passage of a steam turbine The invention relates to a steam turbine (3) having an optical measuring system (60) for measuring a vibration of a moving blade. A transmitter (55) produces a light beam (61) which strikes the moving blade (27, 29, 31, 33) and, reflected from the latter, reaches a receiver (57). By separating the transmitter (55) from the receiver (57), a measuring angle is obtained which reduces the scattered-light effect of steam to such an extent that a reliable optical measurement of the blade vibration surprisingly becomes possible. The invention also relates to a method of measuring the vibration of a moving blade (33) in a flow passage (19, 21, 23, 25) of a steam turbine (3).