Speedy tyre inspection. Non-contact laser-based profile measurement sensors from Micro-Epsilon, have solved an inline inspection problem for a leading tyre manufacturer. Continental Tyres is now using three scanCONTROL 2800 2D13D laser profile sensors from Micro-Epsilon, on a test rig developed by Czech machine builder MicroStep, which inspects individual tyres in less than one second, enabling 100% inspection of tyres from the production line. Rather than using multiple laser-based point sensors or capacitive sensors, the scanCONTROL 2800 sensors measure the tyre's profile using a laser line, on which multiple measurement points can be acquired and analysed. Previously, Continental used capacitive sensors and laser-based optical point sensors to inspect tyres. The capacitive method could not differentiate patterns, symbols or legends on the tyre from genuine surface defects such as bulges. While with the laser point sensors, not oniy would multiple sensors have to be used to acquire surface defect data, but the sensors could not cope with the high throughput rate on the test rig or with the reflection properties of newly-produced, black, shiny rubber tyres. The scanCONTROL 2800 sensor has an integrated, highly-sensitive CMOS array, which enables measurements of almost any shiny, reflective or transparent surface, independent of the reflection from the target. This means accuracy, resolution and reliability are achieved, even at high measurement speeds. Using special software algorithms, logos and symbols on the tyre can be detected and removed when analysing the acquired data. The measurement system consists of three scanCONTROL 2800 sensors and a controller. The measurement data is output from the controller via a Firewire interface to the customer's in-house developed analysis/evaluation software. Other potential applications include contour measurement, robot guidance, door gap alignment, position measurement, rail profile, groove measurement, coplanarity measurement and flatness measurement. Micro-Epsilon's latest version, the scanCONTROL 2810, was unveiled at the Hanover Fair last year and launched officially in Autumn 2005. This new sensor builds on the success of the scanCONTROL 2800 but is even easier to integrate, set up and configure for individual applications. Using the same laser line triangulation measurement principle as the scanCONTROL 2800, it is capable of measuring up to 256,000 points per second. The unit is suited for real time quality inspection or online process guidance. Depending on the resolution and size of the measurement range, a profile frequency of up to 4,000 profiles per second can be attained. Applications include detecting weld seams, beads of adhesive, edges, angles and detecting grooves, channels and gaps. The scanCONTROL 2810 system comprises a sensor and integrated controller, which calculates the dimensions of the bead or groove. The system works in two ways: a stationary mode with the sensor fixed and looking at moving targets, or in combination with a motion control device or robot. The sensor uses an innovative CMOS array with a real time, high speed electronic shutter, which captures the entire profile and processes the information instantaneously. The controller evaluates the measurement data and provides control signals via analogue or digital outputs. The system can be easily configured using the parameter software included within the sensor package. Parameters that can be configured include area, height and width of the bead. _________________________________________________________ April 2006

Home - Search - Suppliers - Links - New Products - Catalogues - Magazines
Problem Page - Applications - How they work - Tech Tips - Training - Events