Accession Number:

AD0752218

Title:

A Seismic Communications Investigation Employing a Piezoelectric Transducer

Descriptive Note:

Final rept. Nov 1971-Jul 1972

Corporate Author:

SOUTHWEST RESEARCH INST SAN ANTONIO TX

Personal Author(s):

• Johnson, Craig C.

Report Date:

1972-09-01

Pagination or Media Count:

57.0

Abstract:

The purpose of this effort was to investigate the feasibility of employing a piezoelectric transducer for seismic communications in mine environments. The transducer incorporated a high Q, spring-mass resonator to load the air side of the piezoelectric crystal. The resonant frequency was seismic load dependent and fell in the range of 300 to 340 Hz. The effort included a mathematical analysis of the transducer, with corroborative laboratory tests, together with actual communications experiments performed first in an open-formation limestone quarry and finally in an operating iron mine.

Descriptors:

• *PIEZOELECTRIC TRANSDUCERS
• PROPAGATION
• MINING ENGINEERING
• SEISMIC WAVES
• UNDERGROUND
• UNDERGROUND STRUCTURES

Subject Categories:

• Mining Engineering
• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE