Plastic material which is permeable for IR (infra red) signals 3

[jacoolo]

As mentioned in subject - Can anyone tell me what plastic material shall I use for device with IR antena(reciever)?

thx in advance

 

[patprimmer]

Opaque is indeed no transmission.
Translucent is transmission with light being scattered so that form cannot be seen, such s frosted glass.
Clear means al light passes straight through with no scatter.
Colour means some parts of the spectrum of visible light is absorbed and some passes through or is reflected.
A coloured tint is when some part of the visible spectrum is transmitted, like sun glasses.

IR receiver lenses are normally a dark red tint with quite low transmission of visible light, but good transparency of IR light in the required wavelength band, but they could be clear or opaque at visible light wavelengths either by the natural colour or opacity of the base resin or by an colour od dye or pigment that is still transparent in the required IR wavelength band.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.

 

[EngAP]

The questioner asked specifically:

"Can anyone tell me what plastic material shall I use for device with IR antena(reciever)?@

Followed by:

"it should be LESS transparent for human eye to hide what is covered inside."

I therefore suggested a material that would fulfil this criteria, in the belief that this would give the questioner an option to look into, and that if they required more information to contact Bayer.

I did not imply that I knew everything about it or that that is the ONLY material to use. In fact I suggested the opposite, that I have limited knowledge of the subject. The last thing I intended was to tell the questioner what to use. They should make up their own mind based on as much information that they have available.

If it is for secrecy resons then yes, a fully opaque material (to visible light) would be more appropriate.

I had also seen that PC was mentioned earlier but I thought I would add some additional information. Now further information has been added by other posters it is even better.

I suggetested the poster contact Bayer as they would have received exactly the information that you posted and that I have in front of me.

 

[patprimmer]

But your transmission figures were wrong in fact. They might be correct for a specific colour of Makrolon, but that was missing and it was incorrect to suggest it as a property of the grade in general.

I find it good practice to not recommend brand names unless there is no option. I also find it good practice in a "non commercial" technical only forum to recommend several prominent suppliers or a variety of suppliers.

I also try to avoid such lengthy replies unless necessary. Sadly this case became necessary to refute incorrect information.

I also try to aim my reply to the OPs level. In this case he was obviously a bright and competent technician with a decision outside his normal experience. He had done his homework and only appeared to need guidance not high level of detail. He was obviously English second language, so easy to read answers were required. When asked for missing information, he always provided it so he could be trusted to follow a lead without spoon feeding.

Regards

eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.