Methodology development in digital automatic particle counting with light microscope for technical cleanliness

Important results from the project

The goal was to obtain comparable measurements with today´s microscopy methods, but it was not possible because the instruments. The recommendation is that those who set requirements are aware of the limitations of the methods. The project has lasted longer than planned, which has led to technological development in the automotive industry. This showed new needs in particle analysis. Some types of particles are not detected in the light microscopy. It is important for the quality of an electric motor that these types of particles are also quantified.

Expected long term effects

When developing and producing new products that require particle cleanliness, mainly electrification but also digital hydraulics, an investigation should be made into which methods are suitable for the particles that needs to be analysed. It is likely that more advanced techniques need to be used more regularly. This will require new investments in the companies. As regards the detection of fibers and reflective particles, the needs have increased. Current methods and requirements give very different results depending on how you interpret them. There is a need for standardization.

Approach and implementation

The project was done by RISE AB with Gnosjö Automatsvarvning AB, Volvo GTO, NYLI Metrology AB, Parker Hannifin and CFR. Review of several Round Robin carried out within CFR, i.e. with several different actors and types of measurement systems was done. In these comparison measurements, emphasis was placed on making parameters equal. The analyzes went well, but differences remained. Some trends exist, e.g. more resolution detects more, but it doesn´t solve everything There are no clear directives for reflective particles and fibre that will be in demand going forward.