Development of new zooplankton observation method using linear FM signals and spectral analysis

2015 Fiscal Year Final Research Report

• Project/Area Number: 25630400
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Naval and maritime engineering
• Research Institution: Tokyo University of Marine Science and Technology
• Principal Investigator: Amakasu Kazuo 東京海洋大学, 先端科学技術研究センター, 助教 (80452043)
• Co-Investigator(Renkei-kenkyūsha): MUKAI Tohru 北海道大学, 水産科学研究科(研究院), 准教授 (60209971)
• Research Collaborator: SASAKURA Toyoki
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: リニアFM信号 / スペクトル分析 / 動物プランクトン / エコーサウンダー

Outline of Final Research Achievements

A broadband echosounder which can use high-frequency linear FM signals was built. The usable frequency range is 250 to 700 kHz and is suitable for zooplankton observation. A calibration method using a 38.1-mm diameter tungsten carbide sphere was established for this echosounder. This method uses a specular echo from the sphere, which can obtained by applying the pulse compression processing to the received echo and improving the range resolution. Spectrum measurement for a 20.6-mm sphere and 20 to 40-mm-long shrimps was conducted in a tank and then we confirmed that specific spectra which depend on targets can be obtained. The results of this study are useful for developing a new zooplankton observation method.

Free Research Field

海洋音響学