The MMD enables PSA metrology engineers to complete detailed geometric scans of small to large vehicle body parts in record time. After upgrading optical metrology equipment with a handheld Metris ModelMaker D (MMD) scanner for noncontact 3D measurement, PSA radically increased scanning productivity Featuring 100mm laser stripe width and all-digital operation, the MMD enables PSA metrology engineers to complete detailed geometric scans of small to large vehicle body parts in record time
They take the portable systems to any location or site, set it up and measure parts on the spot. The interaction between localiser, scanner and software speeds up scanning throughput and trims down post-processing and analysis work. Fast turnaround scanning additionally enables PSA to systematically digitise body frames, doors, windscreens and other parts and use the acquired data to validate numerical calculations, ultimately contributing to fewer mechanical prototypes.
PSA has significant experience in applying laser scanning to digitise the geometry of vehicle body parts of prototype or early production vehicles. The largest part that PSA metrology engineers scan using the handheld Metris MMD is a body-in-white structure. Positioning the articulated measurement arm at one or two locations is sufficient to digitise a hood or the entire backside of a vehicle body. Metrology engineers at PSA also use Metris MMD to scan interior trim parts and light units. To deliver top data quality for different surface types under difficult lighting conditions, the Metris MMD scanner features ESP (Enhances Sensor Performance).
ESP is an algorithm that automatically adapts camera and laser settings to accommodate varying surface shape, colour and reflectivity. This helps PSA engineers accurately deal with sheet metal, composites and plastics, without preparation measures such as sprays. With a laser line that counts as many as 1028 measurement points, the scanner reliably digitises freeform surfaces as well as the edges of individual features. Another reason why PSA opted for a noncontact scanning solution is the ability to reliably digitise softer trim material, eliminating the risk to scratch fragile components or press flexible parts.
On finished cars, the system serves as an optical gauge for flush and gap inspection between body panels. When scanning a vehicle body part, a PSA engineer operates the laser scanner while the scanned surface takes shape in real time on the laptop screen. The displayed information provides instant feedback regarding scanning speed, coverage and progress. Scanning takes place at a relentless pace, thanks to the scanner’s extra large laser stripe and fast digital signal processing”.
Besides monitoring the geometric quality of vehicle body parts – Metris laser scanning forms an essential step in verifying numerical calculations PSA performs as part of virtual simulation. Metrology engineers at PSA use the Metris MMD scanner to acquire digital 3D copies of structural components such as body frames, doors, windscreens and other parts. This touch with reality increases simulation accuracy and helps reduce the number of lengthy and costly physical prototype cycles.
