Question: Can you detect pvc microplastics with a nvdi camera?

Ag8n asked on May 18, 2018 16:02
197 | 2 answers | #16364

Pvc, as it degrades, forms conjugated double bounds that eventually work their way from the infra red into the visible spectrum. So... Can an NVDI camera detect or other near infrared camera detect pvc microparticles?


The process that polyvinyl chloride ( PVC) degrades by is hehydrohalogenation. First, one double bond is formed, then a second conjugated with the first, then a third conjugated with the first two, etc. The process continues. This is why clear PVC degrades by yellowing ( or blackening). As more double bonds are added to the line, where the spectrum absorbs shifts from the infrared, to the near infrared, to the visible. That's the basis of the question. Thank you for any help.

That is dehydrohalogenation.

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2 Answers

I checked youtube. There are videos of cameras separating all kinds of plastics with NIR. That is PE , PS, PVC, and a bunch of others. So the approach is viable. Whether it will work with the ndvi cameras is another question.


Great, any links to specific videos?

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The company is LLA out of Germany. They say the particles can go down to 3 mm in size. Looks like a good match for the microparticles- or at least more work.

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