Abstract
A TRANSPONDING acoustic fish tag has been developed for use with the ARL scanner which is fitted to the Ministry of Agriculture's research vessel Clione. The design and installation of the ARL scanner have been described already1,2. The sonar transmitter floodlights a volume of sea, 30° in one plane by 10° in the other, by transmitting an acoustic pulse which lasts 100 µs, two or four times per second. This gives a range resolution of 7.5 cm and maximum ranges of 366 m and 183 m respectively. A receiving beam is swept over the same volume 10,000 times per second, with a resolution of 0.33° in the 30° plane. Thus, with this beam sweeping in the horizontal plane, a plan position display (CRT) is obtained of targets in midwater or of features on the seabed. The mode of operation can be changed so that the beam scans in the vertical instead of the horizontal plane. In this case the depth of a target can be obtained as well as a profile of the seabed.
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References
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WALKER, M., MITSON, R. & STORETON-WEST, T. Trials with a Transponding Acoustic Fish Tag tracked with an Electronic Sector Scanning Sonar. Nature 229, 196–198 (1971). https://doi.org/10.1038/229196a0
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DOI: https://doi.org/10.1038/229196a0
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