2134/19749
Neil A. Halliwell
Neil A.
Halliwell
Alan Hocknell
Alan
Hocknell
Steve Rothberg
Steve
Rothberg
On the measurement of angular vibration displacements: a laser tiltmeter
Loughborough University
2015
untagged
Mechanical Engineering not elsewhere classified
2015-12-04 16:02:29
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/On_the_measurement_of_angular_vibration_displacements_a_laser_tiltmeter/9548594
A novel modification and use of the optical geometry which is used as the basis for the
Laser Torsional Vibrometer [1] is described. This latter instrument measures the torsional
oscillation (or local rotational speed fluctuation) of a rotating component of arbitrary
shape and in the presence of solid body vibrations of the component itself. The Laser
Torsional Vibrometer relies on the mean speed of rotation of the component to produce
a time resolved voltage analogue of the angular velocity. There are many cases of
engineering interest however where a component undergoes an angular oscillation about
an axis rather than a simple translation or rotation with a unidirectional angular velocity
In modal analysis for example where rotational and translation motions are of equal
importance the absence of suitable transducers means rotational mobilities are rarely
measured [2]. In what follows it is shown how a modification to the optical geometry of
the Laser Torsional Vibrometer can produce an instrument which is capable of measuring
the local angular or tilt velocity in this situation and will therefore solve this problem.