Title :
Laser torquemeter: a new instrument
Author :
Wilmshurst, T.H. ; Rothberg, S.J. ; Halliwell, N.A.
Author_Institution :
Dept. of Electron., Southampton Univ., UK
Abstract :
A noncontact torquemeter is described whose operation relies on the periodicity of the dynamic laser speckle pattern backscattered from a rotating shaft. At 1800 RPM, some 100 time-resolved torque readings per cycle are possible to an accuracy of approximately 1´ of shaft twist. In addition there is inbuilt immunity to shaft speed fluctuations and whole body vibrations.
Keywords :
measurement by laser beam; optical instruments; speckle; torquemeters; backscattered speckle patterns; dynamic laser speckle pattern; laser torquemeter; noncontact torquemeter; rotating shaft; shaft speed fluctuations; shaft twist; speckle pattern periodicity; time-resolved torque readings; whole body vibrations;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19910119
