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From: ron@brl-sem.UUCP
Newsgroups: sci.electronics,sci.physics
Subject: Re: Laser eavesdropping
Message-ID: <704@brl-sem.ARPA>
Date: Tue, 31-Mar-87 17:46:10 EST
Article-I.D.: brl-sem.704
Posted: Tue Mar 31 17:46:10 1987
Date-Received: Fri, 3-Apr-87 00:36:06 EST
References: <499@sw1e.UUCP> <1505@husc6.UUCP> <560@sdiris1.UUCP> <503@sw1e.UUCP>
Organization: Electronic Brain Research Lab
Lines: 9
Keywords: modulation
Xref: utgpu sci.electronics:443 sci.physics:1007


We tried this rather crudely one day.  Using a sheet of aluminum foil
draped accross a stereo speaker (simulating the window) a friend shone
a laser at the foil, the reflection's modulation is viewed as a scattering
or visible wiggle of the beam, not as a simple distance change.  Detection
was done with a cheapo photoresiter in a kaliedoscope with walkman headphones
arrangement that someone got out of a science toy kit.

-Ron