Evaluation of measurement limits of transducer mountings in the ground

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Journal titleCanadian Acoustics/Acoustique Canadienne
IssueSept. 3
Pages1527; # of pages: 13
Subjectvibrations; measuring instruments; Vibrations; vibration (onde); instrument de mésure
AbstractThe distortion of ground vibration measurements by different methods for mounting transducers in the ground is investigated experimentally. The following mountings are considered: (i) Tapered stake having cruciform cross- section; (ii) Wood plate attached to the ground with threaded thin rods; and (iii) Embedded aluminum box of density equivalent to that of soil. The frequency range over which acceptable measurements of ground vibrations can be made is determined for each of these mountings using frequency response tests. These tests are performed by lightly impacting the mounting with a small instrumented hammer. The impact force and the response of the mounting were recorded and analyzed on a two-channel frequency analyzer. Tests were performed at two sites: stiff clay and fine loose sand. Results show that the frequency limit for acceptable accuracy was about 200 Hz for the plate and stake mountings, whereas that for the embedded box mounting was about 120 Hz. The plate and stake mountings were found more convenient to use that the embedded box mounting.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number32336
NPARC number20378076
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Record identifier652850d0-33bb-41df-9e97-60089682a64a
Record created2012-07-24
Record modified2016-05-09
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