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AssigneeSiemens Aktiengesellschaft
InventorFrank Woditschka
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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).
A steam turbine (3) having a flow passage (25) in which a moving blade (33) is arranged, and having a measuring system (60) for measuring a vibration of the moving blade (33), characterized in that the measuring system (60) comprises a transmitter (55) for emitting a light beam (61) to the moving blade (33) and a receiver (57) for receiving the light beam (63) reflected from the moving blade (33), the transmitter (55) being separate from the receiver (57), and the transmitter (55) and receiver (57) being arranged in at least one casing part (10, 12, 14, 15, 17) of the steam turbine (3).
A method of measuring the vibration of a moving blade (33) in a flow passage (25) of a steam turbine (3), characterized in that a light beam (61) is directed onto a moving blade (33) and is reflected from the latter at an angle of reflection (α) greater than 45° and directed to a receiver (57), the blade vibration being calculated from the signal thus received.
Dependencies are inferred from the claim text.