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.
| 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 |
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