Calibration of the BASS acoustic current meter with carrageenan agar

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Abstract

The BASS current meter can measure currents down to the millimeter per second range. Due to the dependence of zero offset on pressure, determining a sensor referenced velocity requires accurate in situ zeroing of the meter. Previously, flow was restricted during calibration by placing plastic bags around the acoustic volume. In this paper, bacterial grade and carrageenan agars are used in the laboratory to create a zero flow condition during calibration and are shown to be acoustically transparent. Additionally, the results of open ocean and dockside carrageenan and plastic bag comparisons are presented. Carrageenan is shown to reliably provide a low noise, zero mean flow environment that is largely independent of ambient conditions. The improved zeros make millimeter per second accuracy possible under field conditions.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Calibration of the BASS acoustic current meter with carrageenan agar
ISBN 0-7803-1385-2
DOI 10.1109/OCEANS.1993.326175
Volume 3
Year Published 1993
Language English
Publisher Institute of Electrical and Electronics Engineers
Contributing office(s) Woods Hole Coastal and Marine Science Center
Description 6 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Oceans '93: Engineering in harmony with the ocean: Proceedings (Vol. 3)
First page 143
Last page 148
Conference Title Oceans '93: Engineering in harmony with the ocean
Conference Location Victoria, BC
Conference Date October 18-21, 1993