Ask the Experts
Published on: 07/09/2020
Last Reply on: 01/27/2021
Category: Non-Visible Imaging
What would be the best lighting solution for inspecting glass parts within a polycarbonate plastic enclosure?
I am assuming that both the glass and polycarbonate are clear and transparent. I see two options. If the glass has a lower transmission than the polycarbonate in the infrared region, infrared backlighting might work. If the transmissivity of the two is the same within a reasonable wavelength range, then you need to take advantage of the differences in index of refraction. The easiest way to image this is with a collimated (telecentric) backlight. You might experiment with a polarizing sensing camera which are available from several camera companies. There are other techniques (e.g., schlieren imaging), but they are far more difficult to implement. You can contact me if you have more questions.
Kyle, As Perry hinted at this could be a challenging issue depending on the two surfaces you are looking at, If you have samples you are willing to share, we can undertake a vision study and see if we can get any results that would be usable in a system. Andy
Hey Kyle, The simple answer is that it depends, I say there is no one perfect solution! It depends on the thickness of the enclosure, the transparency of the glass, and what inspection you are actually going for. I very recently helped with an application using IR light which would "burn" through the plastic enclosure but would not make it through the substance it contained ... worked great when we were doing presence/absence and basic measurement. Here at Gibson we represent a number of different lighting manufacturers and have a complete vision lab to test parts/applications/projects out (usually we perform vision evaluations with our Cognex cameras), shoot me an email if you'd like to know more!
We can not understand it without looking at the actual one, but if you use our V-ISA lighting, you can see the 3D information of most things and the change of the surface condition, so please consider it. https://mvl-inc.com/MVL_HP/New_Product_3e.html
Hi Kyle, our new Imaging Modules, and Digital Microscope have both a Coaxial LED and a Ringlight LED, which you can use on option: Take a look at our homepage: https://www.opto.de/en/imaging-module/mv-microscope/ If you send us samples, we can make tests for you. Sometimes we use a light source from above and a mirror underneath. Are you already using a Microscope - which one? Contact us at: firstname.lastname@example.org
Kyle, thank you for your question. We can help you with this however to do so with the best results there is more information needed. Please reach out to Nolan Greve our Applications Specialist and he would be happy to assist you. 231-722-1199 or email@example.com. Also feel free to visit our website at www.smartvisionlights.com. Thank you, Dave Spaulding