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The engineer tasked with solving the problem wondered whether there might be an alternative to ultraviolet that would do a better job of revealing the defects. He sent a representative sample of granules and we tried all 5 of the fluorescence excitation/emission wavelength combinations available with our Stereo Microscope Fluorescence Adapter. It took just a few minutes after they were received to put the particles under the stereo microscope and cycle through the options. It was quickly obvious that the Royal Blue excitation/emission set worked best, providing high fluorescence brightness along with good contrast between the defective areas and the bulk of the material.
You can see the results in the images below. (Note that while the contrast looks good with several other excitation wavelengths, the images do not capture the actual brightness apparent to an observer.)
This empirical investigation was a quick and effective way to test available technology to find a practical solution to a real-world problem. The manufacturer purchased the Stereo Microscope Fluorescence Adapter to help improve their process control, and also purchased fluorescence excitation flashlights and filter glasses so that they could quickly scan larger batches of particles. NIGHTSEA fluorescence equipment is now a standard part of their quality control and process improvement operations.