Newsgroups: comp.robotics
Path: brunix!uunet!spool.mu.edu!darwin.sura.net!Sirius.dfn.de!chx400!bernina!nautilus!vestli
From: vestli@ifr.ethz.ch (Sjur Jonas Vestli)
Subject: Re: ultrasonic ranging
Message-ID: <1992Sep22.093307@nautilus.ifr.ethz.ch>
Keywords: array, ultrasonics, gerbils
Sender: news@bernina.ethz.ch (USENET News System)
Reply-To: vestli@ifr.ethz.ch (Sjur Jonas Vestli)
Organization: Swiss Federal Institute of Technology - Inst. of Robotics
References: <hb1nfph.nagle@netcom.com> <lbg6j0INN6m8@exodus.Eng.Sun.COM> <BuqC68.EFz@snuffy.wa.atk.com> <7000@tekig7.PEN.TEK.COM> <hattori.717112336@convex.convex.com>
Date: Tue, 22 Sep 1992 07:33:07 GMT
Lines: 32

In article <hattori.717112336@convex.convex.com>, hattori@convex.com
(Mato Hattori) writes:
|> In <7000@tekig7.PEN.TEK.COM> mitchelr@tekig6.PEN.TEK.COM (Ryan James
Mitchell) writes:
|> >	I have thought of an idea (probably not a new one) that is a
combination
|> >of triangulation and image processing.  Using one transmitter and
two    
|> >symmetrically spaced receivers, at 200khz at least, sample the two
receivers
|> >into a computer.  ...          ^^^^^^^^^^^^^^^^^^^^^
|> 
|> As you know, when the frequensy of sound get higher, the reduction
during
|> propagation will be bigger.  I think it's difficult to make a
transmitter 
|> powerful enough to sens reflection with a receiver.  Do you have some
idea
|> to make transmitter and receiver able to use 200KHz ?


Well, there are commercial sensors available using this frequency
(actually I
think it is 220 kHz) using a reflection principle. Try contacting:
  Massa Product Corporation
  280 Lincoln Street
  Hingham
  Massachusetts 02043
  Tel 617 749 4800
  Fax 617 740 2045

Sjur
