水産音響技術の20年間の発展と漁業への応用

概要

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Acoustics is the most effective tool of underwater remote sensing, and so fish finder using ultrasonic has been used from the 1950's. Many new digital acoustic instruments have been developed for these 20 years by advanced technologies of digital signal processing, PC, and mass storages. A quantitative echosounder to estimate the size and amount of fish is one of the equipment most evolved in the past 20 years. The recent system can measure not only large adult fish but also, larvae, micro nekton, and zooplankton with high resolution. As echo from an animal is changed on various conditions, such as size, species, action, maturity, etc., in order to estimate these details from echo signals inversely, it competes for the development of multi-beam quantitative echosounder and analysis technology using multi-frequency or broadband sound.
2012-02-15