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15856Re: [SeattleRobotics] Re: SRF08 beam angle

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  • RoboVac
    Dec 1, 2003
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      The ones I have seen on commercial products were parabolas instead of cones.
      They typically were very long compared to the diameter.

      William Crolley

      ----- Original Message -----
      From: "dan michaels" <dan@...>
      To: <SeattleRobotics@yahoogroups.com>
      Sent: Monday, December 01, 2003 8:47 PM
      Subject: [SeattleRobotics] Re: SRF08 beam angle

      > --- In SeattleRobotics@yahoogroups.com, "Phil" <phil1960us@y...>
      > wrote:
      > > what about some sort of tuning "pipe" that you slip over the
      > reciever
      > > to decrease the field of view that the receiver actually sees?
      > sort
      > > 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
      > www.oricomtech.com
      > ============================
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