Article View: comp.robotics
Article #1594Re: Getting narrow-beam range data
From: Willie Smith
Date: Sat, 08 Jun 1991 12:04
Date: Sat, 08 Jun 1991 12:04
18 lines
1233 bytes
1233 bytes
In article <160412.13057@timbuk.cray.com>,
kilian@cray.com (Alan Kilian) writes...
> 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?
Correction, the beam width is _inversely proportional_ to transducer size.
As the transducer size increases, the beam gets smaller. An array of
transducers acts just like a single larger one when you drive them right.
Don't ask me for details, I don't have any, try Polaroid, they suggested it
to me...
Willie Smith
smith@sndpit.enet.dec.com
smith%sndpit.enet.dec.com@decwrl.dec.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!elroy.jpl.nasa.gov!decwrl!pa.dec.com!nntpd.lkg.dec.com!sousa!sndpit.enet.dec.com!smith From: smith@sndpit.enet.dec.com (Willie Smith) Newsgroups: comp.robotics Subject: Re: Getting narrow-beam range data Message-ID: <1291@sousa.ltn.dec.com> Date: 8 Jun 91 12:04:14 GMT Sender: newsa@sousa.ltn.dec.com Organization: Digital Equipment Corporation Lines: 18