A newly designed underwater antenna and its application to underwater radio-telemetry for measuring electroencephalographic activity from the rainbow trout freely swimming in natural environments.

Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering Pub Date : 1999-01-01

Y Kudo, M Satou, S Kitamura, M Iwata, Y Takeuchi

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Abstract

A novel underwater antenna (which we named an 'aquaerial') for telemetering the biological signals from freely swimming fish in freshwater natural environments is presented. It is designed for receiving a 90-100 MHz carrier wave and consists of plural unit receiving antennas (UAs). The plural UAs are placed underwater to cover the area where the target fish carrying the transmitter is swimming. The UAs are equally spaced and have a directional coupling amplifier to supply the signals received to the coaxial cable. The optimal length of the UA was found to be 16.5 cm (a half wavelength in water) and optimal spacing was 2 m (one wavelength along coaxial cable) when 95 MHz was used as the carrier frequency. Using this 'aquaerial', long-term monitoring of EEG signals from the olfactory bulb of the rainbow trout (Oncorhynchus mykiss) swimming freely in natural environments was achieved.

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一种新设计的水下天线及其在水下无线电遥测中的应用，用于测量自然环境中自由游动的虹鳟的脑电图活动。

提出了一种新型水下天线(我们称之为“aquaerial”)，用于遥测淡水自然环境中自由游动的鱼类的生物信号。它设计用于接收90-100 MHz载波，由多个单元接收天线(UAs)组成。多个无人机被放置在水下，以覆盖携带发射器的目标鱼游动的区域。ua是等间隔的，并且有一个定向耦合放大器来提供接收到的信号到同轴电缆。当载波频率为95 MHz时，UA的最佳长度为16.5 cm(水中半个波长)，最佳间距为2 m(沿同轴电缆一个波长)。利用这种“水生生物”，可以长期监测在自然环境中自由游动的虹鳟(Oncorhynchus mykiss)嗅球的脑电图信号。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Frontiers of medical and biological engineering : the international journal of the Japan Society of Medical Electronics and Biological Engineering

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