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<\/a><\/figure>\n\n\n\nProblem Statement<\/h3>\n\n\n\n
Leaks<\/strong> can occur even when a seal is present that is supposed to prevent them. Often such a seal is located inside the product and is not visible from the outside.<\/strong><\/p>\n\n\n\n But how do you know if the seal is functioning properly? Does it seal effectively and behave as expected? Or is there any deformation<\/strong> causing gaps<\/strong>? This can lead to leakage or other undesirable behavior.<\/p>\n\n\n\n CT scanning<\/strong> offers a solution here: it allows us to look inside the product and inspect<\/strong> and assess the seal<\/strong> without having to open it<\/strong>. We illustrate this further with a scan of a plastic box.<\/p>\n\n\n\n The black-and-white images of the CT scan, similar to the X-ray images you know from the hospital, give us a clear picture of what is happening inside the product.<\/p>\n\n\n\n On the scan, the rubber on the inside is clearly visible. The different shades of gray <\/strong>detected are related to the density of the materials<\/strong>.<\/p>\n\n\n\n In this case, we have benefit from the significant contrast in gray values between the plastic and the rubber, allowing us to clearly<\/strong> distinguish<\/strong> the two materials<\/strong>.<\/p>\n\n\n\n The software can plot all the gray values<\/strong> in a histogram<\/strong>. Each peak<\/strong> generally indicates a different material.<\/strong><\/p>\n\n\n\n This allows us to distinguish, for example, between the rubber and the hard plastic. As a result, we can isolate each material, and therefore each component, and polygonize<\/strong> them separately<\/strong>.<\/p>\n\n\n\n Even fine details are clearly distinguishable.<\/p>\n\n\n\n The question often arises as to whether air or liquid can enter undesirably<\/strong>. Black-and-white CT images are very valuable here, as they visually show whether there is a possible pathway inside<\/strong>.<\/p>\n\n\n\n You can clearly see where the seal ring makes contact. When a gap<\/strong> is present, it can also be accurately measured<\/strong>. In the example along here, the rubber touches the edges on the right side and bottom. On the left side and top again, the size of the opening can then be measured.<\/p>\n\n\n\n If we zoom in<\/strong> sharply, you can see the resolution<\/strong> of the scan. This scan was performed with a voxel size <\/strong>of 0.04 mm.<\/strong> As a rule of thumb, at least 2.5 to 3 voxels<\/strong> are needed to reliably <\/strong>measure<\/strong> a gap<\/strong>. In this case, that means we can measure openings as small as 0.1 mm. Smaller openings are interpreted by the software as a continuous material, which gives the same result as when the surfaces actually make contact.<\/p>\n\n\n\n The black-and-white images give a good idea of what is happening inside. Using the Zeiss Inpect X-ray software<\/strong>, you can \u201cscroll\u201d through your product <\/strong>yourself. This can now also be done via a self-created path.<\/strong><\/p>\n\n\n\nBlack-and-white images<\/h3>\n\n\n\n
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<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n<\/figure>\n\n\n\nIdentifying materials<\/h3>\n\n\n\n
<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n<\/figure>\n\n\n\nMeasuring (unwanted) gaps<\/h3>\n\n\n\n
<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n\n\n\n<\/a><\/figure>\n<\/figure>\n\n\n\nNew functionality<\/h3>\n\n\n\n