Re: [Paparazzi-devel] IR Window Materials

[Andrew S]

Hello
I can say, when contrasts are low, you would have problems. I usually apply 
epoxy in the whole PCB and sensors leads, otherwise raindrop can cause crash of 
your plane. Amplifiers have extremily high gain, and one drop can brake all 
measurements. So I think your matherial is not necessary, try to make own PCB 
to fit your airframe and use epoxy.
Andrew

06.07.09, 08:24, "David Bryant" <address@hidden>:

> Hi all,
> I purchased some infrared transmissible material that I wish to surround 
> my thermopiles with. I purchased it from this link:
> http://www.edmundoptics.com/onlinecatalog/displayproduct.cfm?productid=2043
> They claim "Excellent Optics for Infrared Detectors" and "Minimal 
> Absorption Loss in the 8 to 14 Micron Region". According to the 
> datasheets the critical wavelengths for the thermopiles are 7.5 to 13.5 
> microns.
> I've done some crude tests and seem to get about 50% attenuation through 
> the material.
> Before I test fly this in an aircraft, has anyone had any experience 
> encasing thermopiles in materials, or have any opinions on the matter?
> I imagine the sensors will cope with 50% attenuation, but scattering of 
> the light and thus blurring the distinction between ground and sky may 
> also be an issue...
> Regards,
> Dave
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