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  1. Home
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  3. Fluorescence measurement technology success in production quality assurance

Fluorescence measurement technology success in production quality assurance

28 May, 2022
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By Bhalchandra Chorghade, Editor, CNCTimes.com

‘Qualitative’ and ‘quantitative’ may be just a couple of letters apart, but the difference is huge. When it comes to fluorescence measurement technology it has so far been used almost exclusively for qualitative analyses. Now, for the first time, a team of researchers at the Fraunhofer Institute for Physical Measurement Techniques IPM is successfully using the method to obtain quantitative measurements with a high local resolution.

Many materials and fabrics fluoresce, meaning they shine after irradiation with light, especially UV light. With this method, it is possible to detect fluorescing substances with an extremely high degree of sensitivity. Since many functional coatings, but also impurities, have a characteristic intrinsic fluorescence, they can be detected by fluorescence analysis.

To use fluorescence in metrology, a light source, such as a laser or an LED, must be directed onto the object, which then emits light at a wavelength longer than that of the light source. Optical filters separate the fluorescent light from the excitation light. Cameras or photomultipliers are used for detection. In addition to the pure detection of organic contaminants on surfaces, the evaluation of the spectra is very informative, since in some cases it is possible to differentiate substances based on the spectra.

In production, the use of fluorescence measurement technology for the inspection of surfaces in terms of quality monitoring is of great importance. For example, it must be ensured that surfaces are free from contamination before coating or painting. Components must be checked for cleanness and medical devices for purity and sterility before assembly. Last but not least, the usability of a product often depends on adherence to the purity requirements during manufacture.

Fraunhofer IPM has developed highly sensitive, imaging fluorescence measuring systems for very different applications. Examples include the 100 percent check of oiled sheets and the purity control of metal components prior to welding, soldering or gluing. In addition, this technique can be used to test transparent, organic coatings for completeness and thickness. Due to the high measurement and evaluation speed, the systems can be used directly in the production line. Mechanics, optics, electronics, software and interfaces are customized.

Fluorescence-based techniques have been seen as ways of obtaining estimates rather than as reliable quantitative measurement processes. Ultimately, calibrating the process requires not only precise references but also a profound understanding of the factors that influence fluorescent radiation. “We have succeeded in taking an imprecise process and developing it into a robust and extremely fast precision measurement method,” explains Dr. Albrecht Brandenburg of the Fraunhofer Institute for Physical Measurement Techniques IPM. It seems the world has been holding its breath for this. The technology is spreading both nationally and internationally at an astonishing pace, and sales in this area at Fraunhofer IPM are already in the millions. Dr. Albrecht Brandenburg and Dr. Alexander Blättermann have received the Joseph von Fraunhofer Prize for their achievement. The jury’s decision is based on its high technical performance and the economically quantifiable benefit to the businesses that use it.

https://metrology.news/fluorescence-measurement-technology-success-in-production-quality-assurance/

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