ultrasound
Ultrasound
people use ultrasound technologies, such as sonar and ultrasound imaging to observe things that they cannot see directly.
Sonar is a system that uses sound waves to detect objects underwater, while ultrasound is a medical imaging technique that uses high-frequency sound waves to visualize internal organs and tissues in the body. Sonar is typically used in underwater navigation and communication, while ultrasound is used in medicine for diagnostic purposes.
Sonar, ultrasound, high-frequency sound.
Ultrasound technology was first discovered by Paul Langevin and his assistant in 1916. Sonar, a similar technique, was then developed during World War I. The medical applications of ultrasound were later developed in the 1950s and 1960s.
Ultrasound is sound which has a frequency higher than that of audible sound.( like radar )ADDED: Not like radar. That uses radio waves, although sonar and radar principles are similar.
Active sonar ping is audible, so is not ultrasonic. Passive sonar just listens, but it takes time to determine objects bearing, speed & direction of travel. There is ultrasonic sonar for short range detection such as mines and frogman.
Sonar is commonly used by humans for underwater navigation, communication, and mapping the ocean floor. It is also used in fishing to locate schools of fish and in the military for detecting submarines. Additionally, sonar technology is used in medical imaging, such as ultrasound scans.
Ultrasound uses sound. It was developed with the same principles of sonar used at sea. When sound passes through the body it produces echoes that are able to identify distance, size and the shape of objects.
Marine biologists have been using sonar and ultrasound for many years in Loch Ness to try and get evidence of any unusual life forms in the loch. To the best of my knowledge they have had no success yet.
Humans use sonar technology for various purposes, including underwater navigation, mapping the seafloor, fish finding, and locating underwater objects or shipwrecks. Sonar is also used in military applications for detecting submarines and in medical imaging techniques such as ultrasound imaging.