| 摘要 |
A torsional vibration measuring instrument has a plurality of reflecting means ( 6, 7 ) arranged with stipulated intervals along surface of a rotator ( 5 ) of which torsional vibration is to be measured; a pulse light irradiating means ( 1, 2 ) for irradiating a repetitive pulse light beam to the reflecting means; and an outgoing-transmitting means ( 3, 4 ) for transmitting the irradiated pulse light beam. The torsional vibration measuring instrument also has a plurality of transmitting-receiving means ( 8, 9 ) for irradiating the transmitted pulse light beam to the reflecting means, and for receiving reflected pulse light beams which have been reflected by the reflecting means; and an incoming-transmitting means ( 3, 4 ) for transmitting the reflected pulse light beams which have been received. The torsional vibration measuring instrument also has a plurality of detecting means ( 12, 13 ) for detecting the reflected pulse light beams which have been transmitted by the incoming-transmitting means; and a signal processing means ( 14 ) for processing pulse output signals which have been outputted from the detecting means and for calculating torsional vibration frequency of the rotator to be measured.
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