any transparent IR paint for IR marker tracking?

asked 2018-03-24 03:42:21 -0500

jasper12 gravatar image

I'm looking for a transparent IR paint that will either reflect or retroreflect infrared light while letting the visible spectrum pass though. Usage is AR markers. The augmented reality SDKs use black and white markers and visible spectrum cameras. I don't see a reason why invisible IR markers can't be used instead. For custom markers I'll need some paint.

I think windows are coated with such paints to reduce heat from sunlight in buildings. That's the only thing that comes to my mind.

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Wavelength band for IR sensor? it will depends of emissivity

LBerger gravatar imageLBerger ( 2018-03-24 03:45:23 -0500 )edit

There is no IR sensor but an IR camera (yes I know camera is also technically a sensor but you get my point), the filter is 850nm but 940nm filters are also available.

jasper12 gravatar imagejasper12 ( 2018-03-24 04:06:43 -0500 )edit

if it 850to 940 nm it is near infrared. To get different material properties (transparency) between 850 to 940 and 400 to 800 (opacity) google -> optical bandpass filter

LBerger gravatar imageLBerger ( 2018-03-24 04:23:11 -0500 )edit

Unless we misunderstand each other I know what a bandpass filter is but I am not looking for a filter, I am looking for a paint/coating that I can apply to an existing surface which will act as an IR (okay, "near-infrared") reflector or retroreflector and let me make invisible to the naked eye IR markers.

Unless you mean such paints are also called filters.

PS, it does not have to paint per se, a heat transferable transparent IR film may also work.

jasper12 gravatar imagejasper12 ( 2018-03-24 04:32:58 -0500 )edit

It is off-topics : google infrared paint (

LBerger gravatar imageLBerger ( 2018-03-24 04:39:45 -0500 )edit

it is for making AR markers, is that really off topic?

jasper12 gravatar imagejasper12 ( 2018-03-24 05:00:36 -0500 )edit