FEATURE u Sensors & Sensing Systems


Measurement Technologies Laser triangulation sensors


Laser triangulation sensors project a red or blue laser beam onto the surface. The light reflected from the spot is imaged by an optical receiving system onto a position-sensitive element in the sensor. If the sensor or the measurement object are moved towards the laser beam, the laser sensor determines the correlating distance change. The sensor controller conditions the distance signal and outputs the measured values via interfaces.


As laser triangulation sensors are nearly material-independent, a large range of different material types can be measured. As laser triangulation sensors are not affected by electric or magnetic surface properties, almost all materials can be measured e.g. food, metal, plastics, wood, silicon, rubber, etc. Measurement methods: One- and two-sided measurement.


2D 3D LASER SCANNERS Laser scanners produce a wide laser line on the target to solve various measuring tasks in industry and automation: profile, width, height, depth, edge, bead, gap, angle, roundness and many more. The laser profile scanners of the scanCONTROL series have a


powerful controller integrated in a compact housing. This calculates the two-dimensional profile of the surface from the intensity values on the CMOS sensor matrix. With the SMART models, profile evaluation is possible directly in the sensor. This means that simple or complex measurement tasks can be implemented directly in the scanner and output as a measured value. Suitable for almost any diffuse material surfaces e.g. food, metal, plastics, wood, silicon, rubber, etc.


Measurement methods: One- and two-sided measurement; profile measurement; edge measurement.


CONFOCAL CHROMATIC SENSORS With confocal chromatic measurements, polychromatic white light is focused onto the target surface by an optical system with multiple lenses. The lenses are arranged so that the white light is dispersed into monochromatic wavelengths by controlled chromatic aberration. To each wavelength, a specific distance is assigned by factory calibration. Only the wavelength that is exactly focused on the target is used for the measurement. An optical arrangement images the light reflected onto a light sensitive sensor element, on which the corresponding spectral colour is detected and evaluated. Measurement methods: One-sided thickness measurement of transparent materials; two-sided measurement; multi-layer measurement (e.g. coatings, solar cells, photo masks, smartphone screens).


CAPACITIVE SENSOR TECHNOLOGY The principle of capacitive displacement measurement using the capaNCDT (capacitive Non-Contact Displacement Transducer) system is based on how an ideal plate-type capacitor operates. The two plate electrodes are represented by the sensor and the opposing measurement object. If a constant alternating current flows through the sensor capacitor, the amplitude of the alternating voltage on the sensor is proportional to the distance between the capacitor electrodes. The alternating current is demodulated and output as, for example, an analogue signal. Capacitive sensors are designed to measure against any electrically conductive surface, even semi-conductors. Measurement methods: One-sided thickness measurement of electrically non-conductive materials on metallic objects; two-sided measurement.


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THRUBEAM LASER MICROMETERS Optical micrometers are primarily used as part of the manufacturing process and quality control of a production line, measuring continuous material, as well as single parts. A wide beam is projected between the transmitter and receiver to create a curtain of light. Objects breaking the beam create edges or shadowed areas that are used to determine the object size or position. Suitable for measuring diameters, gaps, segments and edges, these sensors can measure any material that breaks or reduces the light received. Measurement methods: One- and two-sided measurement; profile measurement; edge measurement.


Micro-Epsilon


www.micro-epsilon.co.uk Irish Manufacturing October 2022 23


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