sonobuoy
Noun: A sonobuoy is a buoy equipped with hydrophones and radio transmitting equipment, used to detect and locate underwater sounds, such as those from submarines. It is typically deployed from aircraft or ships and relays acoustic data to a receiving station for analysis.
- (A buoy used to detect underwater sounds.)
- (The buoy's transmitted data helped locate a ship.)
"Passive sonobuoy": A type that only listens for sounds without emitting any signals, making it harder for the target to detect.
- The passive sonobuoy recorded the submarine's propeller noise without alerting the crew. (A listening-only device for stealth detection.)
"Active sonobuoy": A type that emits a sound pulse (ping) and listens for the echo to detect objects.
- The active sonobuoy sent out a ping to measure the distance to the underwater object. (A device that uses sound reflection for detection.)
Sonar (n): a system using sound waves to detect objects underwater, related to sonobuoy technology.
- The ship's sonar detected a large object below the surface. (A broader detection system.)
Buoy (n): a floating device anchored in water, serving as a navigational marker or for data collection.
- The channel was marked by a red buoy. (A general floating marker.)
- Acoustic buoy: a buoy that listens for sound, a direct synonym for sonobuoy.
- Underwater listening device: a general term for equipment that detects sound in water.
Drop a sonobuoy: to deploy a sonobuoy from an aircraft or vessel.
- The helicopter dropped a sonobuoy to monitor the area. (To release the device into the water.)
Deploy a sonobuoy: to set up a sonobuoy for operation.
- The crew deployed a sonobuoy to gather acoustic data. (To activate and position the device.)
- "Listen for a needle in a haystack": an idiom describing the difficulty of detecting a small target in a vast area, akin to using a sonobuoy for submarine detection.
- Finding the submarine with sonobuoys is like listening for a needle in a haystack. (A challenging search task.)