Piezoelectric Geophone

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Piezoelectric Geophone

 

a device for the reception of sound waves that are propagated through rocks. A piezoelectric transducer is used as the receiver. The device is used to locate the origin of the signals sent by miners in the event of a sudden cave-in. It can pick up the sound waves produced by striking a rock with a metal object at a distance of up to 70 m. The origin of the signals is determined by placing the geophone in two listening positions. Piezoelectric geophones are used by rescue teams in mines.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.