Versatile Non-contact Laser Doppler Vibrometer
Sound and vibration measurement specialist, Brüel & Kjaer has
introduced a new non-contact vibration transducer for use in
applications where it is impossible or undesirable to mount a
conventional vibration transducer onto a vibrating object.
The introduction of this exciting new product follows the recent signing
of an exclusive sales distribution agreement between Bruel & Kjaer and
UK-based company Ometron. Under this agreement, all Ometron products
will be sold via the worldwide Bruel & Kjaer sales distribution network.
Based on a Michelson interferometer, the new Bruel & Kjaer Laser
Doppler Vibrometer, Type 8329, offers an alternative to microphones
or accelerometers in applications where, for example, extreme
temperatures may preclude the use of conventional sensors.
Other applications include measurement of vibration onlightweight,
small, delicate and soft objects where an accelerometer would
cause mass loading effects. Impact measurements, relative vibration
measurements (eg on board ships, aircraft and cars), railtrack and
track bed vibration monitoring are further suitable applications.
Capable of measuring vibration in any direction, the Type 8329
features a velocity range up to 425mm/s, frequency range from
<0.1Hz to 25kHz and dynamic range of 73.5dB over full bandwidth.
Measurements are possible from as close as 0.4m and up to 25m
away usually without the need for any surface treatment or
retroreflective tape. For measurements at distances greater than
25m, retro-reflective tape can be used.
The Type 8329 is extremely quick and simple to set up. A built-in
LED bar-graph confirms that the laser is adequately focussed.
A second LED bar-graph indicates the approximate measured
velocity level.
The Type 8329 connects via a simple BNC cable with any Brüel
and Kjaer sound and vibration analysis system such as PULSE
or Portable PULSE. Battery or mains-operated, the portable and
compact Type 8329 offers integrated optics and electronics and
features a Class II laser for safe operation. Despite the precision
nature of the optical and electronic components, the unit is
adequately robust for normal laboratory and field use.
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More information from:
Bruel & Kjaer, Bedford House, Rutherford Close,
Stevenage, Hertfordshire, SG1 2ND. UK
Tel: +44(0) 1438 739000, Fax: +44(0) 1438 739099
E-mail: info@bkgb.co.uk
Web site: http://www.bksv.com/
January 2001