Path: utzoo!attcan!uunet!wuarchive!zaphod.mps.ohio-state.edu!sdd.hp.com!ucsd!chiton!cdl
From: cdl@chiton.ucsd.edu (Carl Lowenstein)
Newsgroups: sci.electronics
Subject: Re: Electronic Stud Finders
Message-ID: <533@chiton.ucsd.edu>
Date: 30 Oct 90 16:25:00 GMT
References: <4110@radio.oakhill.UUCP>
Reply-To: cdl@chiton (Carl Lowenstein)
Organization: MPL of SIO at UCSD
Lines: 19

In article <4110@radio.oakhill.UUCP> charlie@oakhill.UUCP (Charlie Thompson) writes:
>How do those electronic stud finders work?  They seem
>to be able to distinguish fingers from thin air as well.
>They are apparently electrostatic or capactive from what
>I can tell. 

They are acoustic.  Sonar, so to speak.

beep

beep

beep

beep
-- 
        carl lowenstein         marine physical lab     u.c. san diego
        {decvax|ucbvax} !ucsd!mpl!cdl                 cdl@mpl.ucsd.edu
                                                  clowenstein@ucsd.edu