15856Re: [SeattleRobotics] Re: SRF08 beam angle
- Dec 1, 2003The ones I have seen on commercial products were parabolas instead of cones.
They typically were very long compared to the diameter.
----- Original Message -----
From: "dan michaels" <dan@...>
Sent: Monday, December 01, 2003 8:47 PM
Subject: [SeattleRobotics] Re: SRF08 beam angle
> --- In SeattleRobotics@yahoogroups.com, "Phil" <phil1960us@y...>
> > what about some sort of tuning "pipe" that you slip over the
> > to decrease the field of view that the receiver actually sees?
> > of like blinders for a horse...
> I was thinking about the same sort of thing, but I really haven't
> much idea how to do it. Sound works differently from light. Sound can
> go around corners, etc. Something to try might be tubes of rolled
> cardboard/plastic/etc around the transmitter with lengths at "odd"
> multiples of "quarter" wavelength. At even multiples, I think the
> sound pressure will be a minimum, but I'm not really sure about this
> stuff at all. Or possibly a megaphone/conical horn - but again it
> probably needs the correct length and end aperture size for best
> results. Good area for experimentation - plus some preliminary
> legwork into acoustics. Tell us how it goes ;-).
> - dan michaels
> Visit the SRS Website at http://www.seattlerobotics.org
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