echo sounder
echo sounder — 名詞
1. a device on a ship or boat that sends sound signals toward the bottom of the sea
回聲探測儀
利用聲波反射測量水深或探測水下物體的儀器
a device on a ship or boat that sends sound signals toward the bottom of the sea and measures how long they take to come back, so that it can show the water depth or find things under the surface
Tomás checked the echo sounder as the fishing boat crossed the shallow reef.
Tomás 在漁船駛過淺水礁區時檢查了回聲探測儀。
check the echo sounder during navigation
The echo sounder on the research ship showed a sudden drop in the seabed.
研究船上的回聲探測儀顯示海床突然下陷。
Before lowering the anchor, Nila studied the echo sounder to find a safe depth.
Nila 在拋錨前仔細查看了回聲探測儀，以確認安全水深。
A loud warning from the echo sounder told the crew about underwater rocks ahead.
回聲探測儀發出的響亮警報通知船員前方有水下岩層。
- sonar
a broader term for any system that uses sound waves underwater; an echo sounder is a specific type of sonar used mainly for depth measurement
- depth sounder
a near-synonym; 'depth sounder' focuses on measuring depth, while 'echo sounder' can also be used for detecting underwater objects
- fish finder
a type of echo sounder designed for finding fish; more common in recreational boating
用法筆記
This sense also covers the more general description of an instrument that determines water depth by sound-wave reflection.