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From: kilian@cray.com (Alan Kilian)
Newsgroups: comp.robotics
Subject: Re: Getting narrow-beam range data
Message-ID: <160412.13057@timbuk.cray.com>
Date: 7 Jun 91 23:23:34 GMT
References: <1290@sousa.ltn.dec.com>
Lines: 20

In article <1290@sousa.ltn.dec.com>,
  smith@sndpit.enet.dec.com (Willie Smith) writes:
> I called Polaroid the other day and they mentioned that the beamwidth is 
> approximately inversely proportional to transducer size, and one way to get 
> narrow beamwidths is to use arrays of transducers.
> Willie Smith

  I can understand that the beam divergence could be proportional to the
transducer width but I don't see how a larger transducer can produce a narrower
beam. Is this really true?
  Also how does an array of transducers produce a narrow beam?

                  Truth is really stranger than fiction.
                             -Alan

-- 
 -Alan Kilian kilian@cray.com                  612.683.5499
  Cray Research, Inc.           | "If the human brain was so simple that we
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