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From: mikes@AMES-NAS.ARPA
Newsgroups: net.physics
Subject: Re: Microwave and UHF sound detection (bugging embassies, really)
Message-ID: <320@sri-arpa.ARPA>
Date: Wed, 26-Jun-85 12:05:18 EDT
Article-I.D.: sri-arpa.320
Posted: Wed Jun 26 12:05:18 1985
Date-Received: Mon, 1-Jul-85 06:56:31 EDT
Lines: 5

From:  mikes@AMES-NAS.ARPA (Peter Mikes)

    Indeed - the device is based on Laser Doepler Velocitometry - and works
 simply by measuring the distance of the panel as function of time. Such
 devices (for scientific purposes) are avalable comercialy e.g. by HP.