Title :
Comparing two scientific echo sounders
Author :
Jech, J. Michael ; Foote, Kenneth G. ; Chu, Dezhang ; Liberatore, Stephen P.
Author_Institution :
Northeast Fisheries Sci. Center, NOAA/NMFS, Woods Hole, MA, USA
Abstract :
The Simrad EK500 and EK60 scientific echo sounders have been operated with the same 38-kHz, 12-deg-beamwidth, split-beam transducer, with alternate pinging by means of an external triggering-and-switching system. The respective performances of the two systems are compared by means of standard-target calibrations conducted at the acoustic calibration facility on Iselin Dock at Woods Hole Oceanographic Institution with a 60-mm-diameter copper sphere. Principal comparisons include those of time series of echo strength and target strength, split-beam-determined angles, and derived measures of directivity.
Keywords :
oceanographic equipment; oceanographic regions; underwater sound; 38 kHz; EK60 scientific echo sounder; Iselin Dock; Simrad EK500 echo sounder; Woods Hole Oceanographic Institution; acoustic calibration facility; alternate pinging; copper sphere; echo strength; external triggering-and-switching system; split-beam transducer; standard-target calibration; systems performance; target strength; Acoustic beams; Acoustic measurements; Acoustic transducers; Aquaculture; Calibration; Copper; Linear regression; Marine animals; Measurement standards; Sea measurements;
Conference_Titel :
OCEANS 2003. Proceedings
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-933957-30-0
DOI :
10.1109/OCEANS.2003.178118
