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Contact-free speed measurement using lasers

14 May 2010

A new Laser Tacho Probe, The MM-0360 from Bruel and Kjaer, is a small IP64-rated device for performing contact-free measurements on rotating or reciprocating machine parts. The MM-0360 works by producing a voltage pulse from each turn of a shaft or cylinder.

The probe is positioned to allow its visible laser beam to face the test object, on to which a small strip of self-adhesive retro-reflective tape is attached. This reflective tape then backscatters the laser energy to a receiver that converts it to a jitter-free signal, suitable for a measurement or recording system.

The use of reflective tape means the probe can be positioned up to 70cm away from test objects, allowing engineers to be at a safer distance when testing many different types of high-speed machinery, encompassing everything from aircraft turbines to washing machines. The unit’s compact size also makes it ideal for accessing machine parts in difficult-to-reach areas.

The MM-0360 can operate at rotational speeds of up to 300,000rpm, sufficient for supercharger measurements, as well as low-speed measurements to 0rpm (dependent on analysis system) for wind turbine and ship propulsion applications.


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