A candidate pair of standard targets for calibrating a scientific echo sounder over the frequency band 80–130 kHz

Author

Foote, Kenneth G.

Author_Institution

Woods Hole Oceanogr. Instn., Woods Hole, MA, USA

fYear

2014

fDate

14-19 Sept. 2014

Firstpage

1

Lastpage

4

Abstract

The potential design of a new scientific echo sounder, with nominal operating frequency band 80-130 kHz, raises the question of its calibration. It is proposed that this be done by the standard-target method. Based on an earlier study, which optimized a pair of solid elastic spheres for a broadband multibeam sonar with operating frequency band 70-120 kHz [Digital Object Identifier: 10.1109/OCEANS.2006.306944], a new target pair is specified by scaling considerations. Using the respective center frequencies of the two bands, the diameters of the new standard spheres of tungsten carbide with 6% cobalt binder are roughly 19/21 of the previous diameters, 75 and 84 mm, hence 68 and 76 mm. The broadband target strengths of the two targets are computed over a range of environmental conditions, proving their robustness.

Keywords

calibration; sonar; broadband multibeam sonar; broadband target strengths; center frequencies; cobalt binder; environmental conditions; frequency 70 GHz to 120 GHz; frequency 80 kHz to 130 kHz; scaling considerations; scientific echo sounder calibration; size 68 mm; size 75 mm; size 76 mm; size 84 mm; solid elastic spheres; standard-target method; tungsten carbide; Acoustics; Backscatter; Calibration; Sea measurements; Sonar; Standards; System-on-chip;

fLanguage

English

Publisher

ieee

Conference_Titel

Oceans - St. John's, 2014

Conference_Location

St. John´s, NL

Print_ISBN

978-1-4799-4920-5

Type

conf

DOI

10.1109/OCEANS.2014.7003250

Filename

7003250