Automotive Design
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 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,
operates at a wavelength of 405nm. 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..
Measuring brake disc wear
When a vehicle stops or slows down, the brake discs need to absorb and dissipate the entire kinetic energy of the vehicle. The high amount of energy absorbed during vehicle
braking transforms into heat, which makes a brake disc glow red hot under load. The shape of the brake disc can deform during braking as higher energy is absorbed. The full extent of this deformation or disc wear can also be measured using Blue Laser Sensors. Using a conventional red laser sensor would result in
Fig. 4. Micro-Epsilon’s new optoNCDT 1700BL blue laser sensor mounted to an engine manifold to measure vibration and displacement on hot glowing targets.
because it emits the same or very near wavelengths of light as the red laser. To overcome this limitation, Micro-Epsilon has developed a Blue LED Laser Sensor family, which
a high signal interference from the brake disc surface, because it emits the same or very near wavelengths of light as the red laser. Even white hot glowing ceramic discs can be
measured using Blue laser technology, which ensures very stable signals. Blue Laser Sensors can measure red glowing metals up to 1,600°C and silicon up to 1,150°C, with no loss in measurement specification. ●
Chris Jones is Managing Director at Micro-Epsilon UK, Ellesmere Port, Cheshire. UK.
www.micro-epsilon.co.uk
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