INDUSTRY 4.0
The same is also true for metal forging. It was formerly a challenge to use red laser measuring techniques in the steel industry, where red-hot glowing metals, typically above 700 °C, emit sufficient infrared light to skew the image sensor readings. To solve these challenges, blue light laser triangulation technology was developed. Blue lasers operate at approximately 405 nm of the visible light spectrum, a shorter wavelength with lower intensity than red, and close to the ultraviolet spectrum. This creates a more focused laser point with less surface diffusion, resulting in less noise in the sensor, thereby increasing measurement accuracy, sometimes by a scale of two or three times when compared to red lasers. Blue laser technology is more than just a light colour change. It also requires a different lens that is
optimised for short wavelength radiation, different optical filters for the reflected light, a different light sensor and innovative analysis algorithms. Blue light laser triangulation technology has
proved so valuable that the applications for it have expanded over time. It is especially prevalent in automotive testing, for example in engine manifolds or brake discs. It has also been used in paper production because a red light laser shines through damp paper pulp and does not return usable measurements. Blue light is preferable to red light laser
triangulation for measuring transparent or translucent materials, reflective or specular surfaces, and organic materials, including wood and food.
PATENTED TECHNOLOGY Blue laser measurements on red-hot objects, as well as transparent objects such as glass or plastic, is a proprietary and patented technology from Micro-Epsilon. Micro-Epsilon plays a leading role in measurement technology. For more than 50 years, the company has offered reliable, high performance, unique solutions whenever high precision measurement or inspection is required. Its product range covers sensors to measure distance and displacement, sensors for infrared temperature measurement and colour detection, as well as systems for dimensional measurement and defect detection.
Micro-Epsilon UK
https://www.micro-epsilon.co.uk/
Blade angle of razors
Position of electronic components
Transparent plastic
Distance measurement on anti-reflective coated glass, profile measurement on red glowing metal and profile measurement of glue beads using blue laser sensors from Micro-Epsilon.
FACTORY&HANDLINGSOLUTIONS | MARCH 2022 39
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