IR Transparent Projection Screen?

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SUMMARY

The discussion centers on the need for a projection screen that is transparent to infrared (IR) signals while allowing for rear projection. Users suggest materials like frosted glass or plastic, which can transmit both visible light and IR wavelengths, typically around 780-950 nm. Phil is exploring options from SSIDisplays for a suitable transparent screen that meets these criteria. The consensus indicates that while certain materials can transmit IR, the challenge lies in balancing transparency with projection quality.

PREREQUISITES
  • Understanding of infrared wavelengths, specifically 780-950 nm.
  • Knowledge of rear projection techniques and materials.
  • Familiarity with optical properties of materials like frosted glass and plastic.
  • Basic knowledge of projection technology and screen types.
NEXT STEPS
  • Research the optical properties of frosted glass and plastic for projection applications.
  • Investigate the specifications of IR transparent materials for use in projection screens.
  • Explore product offerings from SSIDisplays and similar manufacturers for transparent projection screens.
  • Learn about the impact of different wavelengths on projection quality and IR signal transmission.
USEFUL FOR

Anyone involved in audiovisual technology, including projection specialists, event planners, and engineers looking to optimize rear projection setups while maintaining IR signal integrity.

Philmac
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Hello,

Is there such a thing as a projection screen that is transparent to IR? I need to project an image onto a screen (rear-projection), but I also need to send an IR signal through the screen from the side of the human user back to the side with the projector. I think there are metals/metalloids with this property, but those materials obviously don't make good projection screens. Any ideas?

Thanks,
Phil
 
Engineering news on Phys.org
If you are rear projecting you need a transparent screen anyway - something like frosted glass or plastic

IR remotes are generally around 780-820nm so only 'slightly-infra' red, pretty much anything that transmits red light will also transmit theis level of IR
 
NobodySpecial said:
If you are rear projecting you need a transparent screen anyway - something like frosted glass or plastic

IR remotes are generally around 780-820nm so only 'slightly-infra' red, pretty much anything that transmits red light will also transmit theis level of IR

I have been informed that the wavelength emitted by the IR LEDs is approximately 950 nm. Does this change things? I would prefer not to let red through if possible.
 

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