Feature: Sensors
Changes in thickness during production can indicate
wear of components – for example, in extrusion dies or on rolling stands. Monitoring trends can point to early warning signs. The traditional method of checking thickness in
a production process is to take a measurement from the start of the production run and then again at the end. But, what happens in the middle? If it goes out of tolerance, that’s a lot of scrap to consider, so it’s worth taking readings during the entire process. However, manual checks often require the production line to stop.
Thickness measurement Thickness measurement is an important step in production monitoring, quality assurance and machine control. Although it can be done using contact or non-contact sensors, non-contact methods offer clear advantages in terms of accuracy and measurement speed. Here we will describe non-contact measurement techniques.
Thickness measurement with the right sensors and techniques
By Glenn Wedgbrow, Business Development Manager, Micro-Epsilon UK
W
hen selecting sensors for measuring thickness, the first step is to choose an appropriate method and measurement technology. The material, surface and thickness of the target have a crucial role in deciding
which option is best for the application. Tere are many reasons why thickness is important. All
materials have a tolerance in production: those produced too thin or too thick can cause problems further down the line, or even at the end customer’s site.
24 February 2024
www.electronicsworld.co.uk
One-sided measurement (image above) One-sided thickness measurements are carried out exclusively using non-contact sensors. In this case, only one sensor is used to measure the target thickness or a part of it (e.g., glass thickness).
Two-sided measurement (image above) Two-sided thickness measurements are performed with at least one sensor pair mounted in the same axis. The sensor pair measures synchronously onto the target. The difference between the individual measurement results gives the target thickness.
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