Non-contact solution to vibration problems

SOUND AND vibration measurement specialist, Brüel & Kjær has introduced a non-contact vibration transducer for use in applications where it is impossible or undesirable to mount a conventional vibration transducer onto a vibrating object.

Based on a Michelson interferometer, the new Brüel & Kjær Laser Doppler Vibrometer, Type 8329, offers an alternative to microphones or accelerometers in applications where, for example, extreme temperatures may prelude the use of conventional sensors.

Other applications include measurement of vibration on lightweight and small objects where an accelerometer would cause mass loading effects.

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.