phyduck
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- TL;DR
- I am looking to make a diy version of commercially available privacy sunglasses. The purpose of these glasses is to prevent cctv cameras from using IR facial recognition. Standard sunglass lenses are transparent to infrared.
I am looking to make a DIY version of commercially available privacy sunglasses. The purpose of these glasses is to prevent cctv cameras from using IR facial recognition.
Standard sunglass lenses are transparent to infrared. To circumvent this, the lenses have the ability to absorb IR light. Also, the frames have highly reflective infrared properties, while appearing matte/dull in the visible spectrum. I am guessing that since most cctv ir emitters produce light in the ~850/940nm range, this is the portion of the electromagnetic spectrum at play here.
The commercially available options seem a bit pricey at over 150 USD a pair,, so I'm looking for a diy option. To do this I plan on taking consumer sunglasses and 1) spraying the frame with an IR reflective/invisible to humans coating and 2) placing an IR absorbing film over the lenses. Any ideas on what type of materials I am looking for?
Standard sunglass lenses are transparent to infrared. To circumvent this, the lenses have the ability to absorb IR light. Also, the frames have highly reflective infrared properties, while appearing matte/dull in the visible spectrum. I am guessing that since most cctv ir emitters produce light in the ~850/940nm range, this is the portion of the electromagnetic spectrum at play here.
The commercially available options seem a bit pricey at over 150 USD a pair,, so I'm looking for a diy option. To do this I plan on taking consumer sunglasses and 1) spraying the frame with an IR reflective/invisible to humans coating and 2) placing an IR absorbing film over the lenses. Any ideas on what type of materials I am looking for?