Sean,

You can do pretty good with West Systems epoxy and "clear" hardener.  I have a
clear boat that I use to show the insides to people.

Andy









Sean Breheny <shb7@CORNELL.EDU> on 06/09/2000 12:15:05 AM

Please respond to pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU>








 To:      PICLIST@MITVMA.MIT.EDU

 cc:      (bcc: Andrew Kunz/TDI_NOTES)



 Subject: Re: [EE]: Noise in
          phototransistors/photodiodes/light








Hi Paul,

Actually, I guess I didn't read the previous suggestion well enough,because
what you suggest (except for the foil) is what I was planning on doing, the
sensors in the corners (actually, slightly displaced radially from the
corners because we want some null zone (a couple of degrees each way)).

I really like the foil idea, thanks! I'm afraid I won't be able to do the
custom molded nosecone (unless you know of a cheap way of doing custom
plastic molding!)

Sean

At 08:50 AM 6/9/00 +1000, Paul B. Webster VK2BZC wrote:
>Sean Breheny wrote:
>
>> Yes, what you describe is exactly what I plan on doing. I was planning
>> on using cardboard, painted black, as the barrier.
>
>  I'd suggest the opposite, at least for the "guides".  Use silvered
>foil to maximise gain.  The four photocells mount at the very inside
>corners, with a black barrier behind:
>
>
>           XXXX|XXXX
>         XXXXXX|XXXXXX
>        XXXXXX,|,XXXXXX   <-- sensors
>       --------+--------         in
>        XXXXXX`|`XXXXXX   <-- corners
>         XXXXXX|XXXXXX
>           XXXX|XXXX
>               ^--------- reflective baffles
>
>  As for lensing; I suspect that a custom nosecone could be moulded to
>function as a lens.
>
>  An alternate sensor mounting of course could be on the four sides of
>the fuselage behind the nosecone, using the fuselage itself as the
>baffle.
>--
>  Cheers,
>        Paul B.
>
|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
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