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A broadband target strength measurement method for weakly scattering animals using a 50-ms-long linear frequency modulated signal in a small tank

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  • Fisheries
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Abstract

We built a new pulse-echo system using a small tank (1 × 1 × 1 m) for measuring the broadband target strength of weakly scattering animals such as krill and shrimp. The system transmits a linear frequency modulated signal with a frequency sweep of 20–220 kHz. To increase the signal-to-noise ratio (SNR), a very long (50 ms) signal is used, and pulse compression processing is applied to received echoes. To determine the accuracy and effectiveness of the system and method, the obtained measurements were compared with predictions by theoretical acoustic scattering models. According to the verification experiment for a sphere and cylinders, the mean absolute errors were < 0.30 dB and the correlation coefficients \(r\) were > 0.97 in the frequency range above 20-dB SNR (40–210 kHz for the cylinders). Our measurement system was thus very accurate. We then performed the experiment for a commercially important shrimp, sakura shrimp Lucensosergia lucens. The measured spectra of three samples (35–38 mm) were in good agreement with the predicted spectra using an assumed sound-speed contrast. The \(r\) values were > 0.88 in the frequency range above 20-dB SNR (approximately 110–190 kHz). The effectiveness of our new method for weakly scattering animals was confirmed.

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Acknowledgements

The authors are very grateful to the officers and crew of the RV Suruga-maru of the Shizuoka Prefectural Research Institute of Fishery and Ocean (SPRIFO) for the sampling of live sakura shrimp. We also thank the officers and crew of the TV Shinyo-maru of the Tokyo University of Marine Science and Technology (TUMSAT) for the sampling of live sakura shrimp in previous experiments. Dr. T. Sasakura of Fusion Inc. is acknowledged for his kind support in the construction of the broadband transducer. H. Nonaka, a former undergraduate student, of TUMSAT is also acknowledged for his contribution to this study. This study was conducted as the TUMSAT/SPRIFO joint research and supported by a JSPS KAKENHI grant number JP17H05033.

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Authors and Affiliations

  1. Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo, 108-8477, Japan

    Burak Saygili, Soma Tsuyuki, Jing Liu, Natsuki Yamamoto & Kazuo Amakasu

  2. Present Address: Central Japan Railway Company, JR Central Shinagawa Building A-Wing, 2-1-85 Konan, Minato-ku, Tokyo, 108-8204, Japan

    Soma Tsuyuki

  3. Shizuoka Prefectural Research Institute of Fishery and Ocean, 136-24 Iwashigashima, Yaizu, Shizuoka, 425-0032, Japan

    Kenichi Kobayashi

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  1. Burak Saygili
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  2. Soma Tsuyuki
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  4. Natsuki Yamamoto
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  6. Kazuo Amakasu
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Correspondence to Kazuo Amakasu.

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Saygili, B., Tsuyuki, S., Liu, J. et al. A broadband target strength measurement method for weakly scattering animals using a 50-ms-long linear frequency modulated signal in a small tank. Fish Sci 87, 627–638 (2021). https://doi.org/10.1007/s12562-021-01532-7

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