Acoustic sounding - Onkyosokushin

Japanese: 音響測深 - おんきょうそくしん

A method of measuring water depth using sound waves. An echo sounder emits ultrasonic waves of 10 to 200 kHz vertically, measures the time required from transmission to reception, and converts this to water depth by multiplying it by the assumed speed of sound. It consists of a transmitter/receiver and a control/recording device, and is usually self-recording, providing continuous depth measurements. In recent years, more and more devices have been used that use cathode ray tubes to display in color. They are available in a range of sizes, from shallow water models used in harbors and rivers to models for deep waters of over 10,000 meters. For precise depth measurements, the water temperature and salinity are measured, the sound propagation speed is calculated, and the value obtained based on the assumed speed of sound is corrected. →Sonar/Fish finder→Related topics: Depth sounder | Ultrasonic | Multi-narrow beam echo sounder

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

音波を利用し水深を測定する方法。音響測深機は10〜200kHzの超音波を垂直に放射し，発信から受信までの所要時間を測定し，これに仮定音速を乗じて水深に換算する装置。送受波器と制御・記録装置よりなり，ふつう自記式で連続測深記録が得られる。近年はブラウン管を用いてカラー表示するものもふえている。港湾・河川に使う浅海用から１万m以上の深海用まである。精密測深の際には，水温・塩分を測定し音波伝搬速度を計算し，仮定音速に基づいて得た値を修正する。→ソナー／魚群探知機
→関連項目測深機｜超音波｜マルチ・ナロービーム音響測深機

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