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sonar
has definitions from the fields of nautical,acoustics,transportation
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[ noun ] (nautical,acoustics,transportation) a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return (sonar is SOund NAvigation Ranging; asdic is Anti-Submarine Detection Investigation Committee)
Synonyms Used in print (Walter H. Buchsbaum, "Advances in Medical Electronics"...)Sonar can be used to measure the thickness of the heart by placing small crystal transducers at opposite sides of the heart or blood_vessel and exciting one with some pulsed ultrasonic energy . A sonar or radar type of pulse_generator and time-delay_measuring_system is required for body tissue evaluation . Our readers are familiar with the principles of sonar where sound_waves are sent_out in water and the echoes then indicate submerged objects . In medicine the frequencies are much higher , transducers and the sonar beams themselves are much smaller , and different scanning techniques may be used , but the principles involved are the same as in sonar . In medicine the frequencies are much higher , transducers and the sonar beams themselves are much smaller , and different scanning techniques may be used , but the principles involved are the same as in sonar . |
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