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Emerald Group Publishing Limited
Copyright © 2013, Emerald Group Publishing Limited
Blue laser sensors
Article Type: Mini features From: Sensor Review, Volume 33, Issue 2
For vibration and displacement measurements on hot glowing targets, for example in an engine powertrain, it has traditionally been a challenge to use displacement sensors due to the target being very hot and even glowing red on or near to the exhaust section.
Red laser displacement have tried to perform these types of measurements, but with red-hot glowing objects, a conventional red laser has a high signal interference from the surface of the thermocouple, because it emits the same or very near wavelengths of light as the red laser.
Figure 1 Micro-Epsilon turboSPEED interface
To overcome this limitation, Micro-Epsilon has developed a blue LED laser sensor family, which operates at a wavelength of 405 nm. This wavelength is far from the red part of the visible spectrum, which means it is easier to filter this type of emitted light from the target, ensuring very stable signals. This is a world first for high accuracy laser triangulation sensors and not only works with on red glowing surfaces but also on white hot glowing targets (Figure 1).
For more information, please visit web site: www. micro-epsilon.co.uk