/// ULTRASONIC DETECTION \\\
A sound approach to layer detection
Ultrasonic detection technology is being used as an approach to detecting layered sheets in manufacturing processes
Configurable through-beam ultrasonic sensors can be used for layer detection in multi-layered material processing environments such as calendar machines
M
anufacturers of layered materials are faced with the task of double-sheet detection during processing and in-
spection stages. This requires consistent and reliable detection of one or more layers of materials such as foil, paper, cardboard, la- bels or even thin metal sheets, which can pre- sent complex challenges. If the detection is not accurate and reliable and issues are unresolved, it can lead to ma- chine downtime, wasted materials and ex- pensive repair costs. This can occur across a myriad of applications such as printing, pack- aging, automotive and finishing industries.
Ultrasonic sensors \\\ One of the best approaches to such a difficult
task is to use ultrasonic sensors. Sensing and instrumentation specialist Baumer has long been involved in the production of ultrasonic technology and the latest additions to the company’s range of high-performance ultra- sonic sensors are the U300, U500 and UR18, which represent a range of product families which offer effective and extremely flexible methods of achieving double-sheet detection across a range of materials.
These new sensors offer important func- tions and adjustment options which means they can be adapted to suit many double- sheet detection applications, the most im- portant of which is a through beam sensor. In this case, the receiver of the through beam sensor is equipped with two binary switching outputs as well as an IO-Link interface and is designed to reliably detect the most common materials in the standard setting. However, if critical material thicknesses
occur, the sensor can be adjusted for these more challenging demands through parame- ter configuration. In either IO-Link or switch- ing mode, the sensor reliably detects one, two or more layers of particularly difficult mate- rials such as foil or thin metal sheets. In addition to double-sheet detection, the
sensors can also be used for film tear detec- tion, bonding surface detection and also label detection which is where more diverse mate- rials and varied thicknesses occur as well as more varied installation conditions. Such multi-material detection challenges
are manageable with Baumer’s latest range of ultrasonic sensors because the through beam can be easily adjusted to suit the ma-
terial type being detected as well as other critical factors such as distance.
Parametric adjustment \\\ Thanks to the IO-Link interface, the applica-
tion parameters can be quickly and easily ad- justed using the link to suit different types of sound-absorbing materials. This ensures reli- able detection with the process values related to the material being displayed to enable the switching thresholds to be set accordingly. The sensor is supplied with different phys- ical characteristics to help with positioning and installation. In this way, the transmitter housing and the corresponding receiver can be selected from a range of options depend- ing on the installation requirements. It is also possible to combine a cubic receiver (U500) with a cylindrical transmitter (UR18) which en- sures optimum flexibility in the overall design of the detection system. To enhance flexibility, ease installation and
maintain sensor reliability, all variants of the U300, U500 and UR18 are available from Baumer configured using IO-Link parameters that can be used by the through beam sensor to suit a range of applications. DS&I
2021 /// DAQ, Sensors & Instrumentation \\\ 7
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