Cleanliness inspection

Perfectly clean, residue-free surfaces are crucial for the quality and safety of many products.

Component surfaces play an important role in the quality and functionality of industrially produced products. In many industries, such as automotive or electronics industry, filmic contaminations – especially organic residues – are critical. This is because many welding, adhesive bonding and coating processes react very sensitively to organic contaminations such as residues of drawing, rolling and cooling lubricants or release agents. They can severely disrupt these important steps in the manufacturing process and, in the worst case, render the product unusable or lead to a safety risk.

Another critical factor is particle contamination. A single particle can lead to failure of an entire component assembly. And for the service life of highly stressed components, technical cleanliness is a decisive criterion.

A high and consistent level of cleanliness is therefore crucial for the quality of modern products in many cases.

100-percent cleanliness inspection: Fluorescence measurement systems seamlessly inspect the cleanliness of surfaces.

Fluorescence measurement systems by Fraunhofer IPM monitor and document surface cleanliness of components –in QA labs, on the shop floor or directly inside production or cleaning equipment. Violet or ultraviolet laser radiation excites the fluorescence of organic residues such as lubricants, anti-corrosion oils, release agents, flux and fingerprints. The detection limit for most organic species is in the range of 1 to 10 milligrams per square meter, which corresponds to a layer thickness of only a few nanometers.

Fluorescence measurement systems for cleanliness inspection by Fraunhofer IPM minimize resources and scrap, reduce equipment downtime and maximize the quality and service life of components and systems. They are thus paving the way for sustainable, data-based cleaning and manufacturing processes.

Our systems for cleanliness inspection


Large-scale– Inline – In motion


With the devices of the F-Scanner family, almost any part from less than one square centimeter up to several square meters in size can be inspected for cleanliness in high resolution – in the production line, in the technical center or in the laboratory.

The technology used combines the super-sensitive method of laser-induced fluorescence detection with the concept of laser scanning.


High-resolution cleanliness control


The F-Camera measures contaminations on component surfaces non-contact and imaging at production speed and with a resolution down to the micrometer range. It provides both images and quantitative measurements of the shape, position or quantity of contaminants.


Inspection of mass-produced components

Inspect-360° F

The multi-camera system inspects the component surface in free fall – entirely without handling and simultaneously capturing an image of the component from all sides. This is how 100 percent of the components' surface are captured in a single recording step. 

Contaminations such as oil droplets and film residues are characterized quantitatively.


Detection and classification of particles

Inline particle detector

The particle detector detects and classifies particles on components directly in the production process.

If the quantity of impurities exceeds a defined threshold value, the component can be sorted out or cleaned again and reintroduced into the production process.