Bruel & Kjaer - Endevco - PRODUCT NEWS

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. _________________________________________________ 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: Web site: January 2001