IR Transparent Projection Screen?

[Philmac]

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

 

[NobodySpecial]

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

 

[Philmac]

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.

 

[starley]

I have been looking around for that and am going to order samples of a transparent screen here http://www.ssidisplays.com/products/projection-screens/rear/intrigue
Good luck

 

[alphy]

I can tell you that there are materials that are transparent to infrared (IR) radiation. These materials are typically known as IR transparent materials and are commonly used in applications such as thermal imaging, remote sensing, and IR spectroscopy. Some examples of IR transparent materials include sapphire, quartz, and certain types of plastics and polymers.

However, it is important to note that while these materials may be transparent to IR radiation, they may not necessarily be suitable for use as a projection screen. This is because the properties that make a material transparent to IR radiation may not necessarily make it suitable for projecting images. For example, a material that is transparent to IR radiation may not have the necessary reflective properties to produce a clear and vibrant image when used as a projection screen.

In your case, it may be beneficial to look into using a combination of materials. For example, you could use an IR transparent material for the portion of the screen where you need to send the IR signal through, and a different material for the actual projection screen. Alternatively, you could also consider using specialized coatings or films that are designed to be both IR transparent and suitable for projection purposes.

I hope this information helps and I wish you all the best in finding a solution that meets your needs.