Newsgroups: comp.robotics
Path: brunix!news.Brown.EDU!noc.near.net!howland.reston.ans.net!usc!elroy.jpl.nasa.gov!decwrl!csus.edu!netcom.com!nagle
From: nagle@netcom.com (John Nagle)
Subject: Re: Sonar sensing as near as 4'' 
Message-ID: <nagleCFEyvM.1Bu@netcom.com>
Organization: NETCOM On-line Communication Services (408 241-9760 guest)
References: <1993Oct22.160822.8439@ncsu.edu>
Date: Sun, 24 Oct 1993 18:18:58 GMT
Lines: 9

rmlegran@eos.ncsu.edu (RICHARD MARK LEGRAND) writes:
>I have found a solution to the sonar blanking dilemma, and through a
>simple addition to the drive circuitry, the Polaroid ranging system
>can detect objects as close as 4 inches. (!!!)  

      I'm suprised that works.  Are you using the electrostatic or
piezoelectric transducers?

					John Nagle
