ULTRASONICS - définition. Qu'est-ce que ULTRASONICS
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Qu'est-ce (qui) est ULTRASONICS - définition

SOUND WAVES WITH FREQUENCIES ABOVE THE HUMAN HEARING RANGE
Ultrasonic; Ultrasonography; Ultrasonics; Industrial ultrasonography; Ultrasounds; From Sound to Image; Ultrsound; Ultra sound; Ultrasonic wave; Biomedical ultrasonic; Ultrasound CT; Ultra-sonic; Ultra-sound; Ultrasonic time-domain reflectometry; Endobronchial ultrasound
  • Head of a fetus, aged 29 weeks, in a "[[3D ultrasound]]"
  • An ultrasonic examination
  • Bats use ultrasounds to navigate in the darkness.
  • Ultrasound image (sonogram)  of a fetus in the womb, viewed at 12 weeks of pregnancy (bidimensional scan)
  • Sonogram]] of a fetus at 14 weeks (profile)
  • Fetal ultrasound
  • Galton whistle, one of the first devices to produce ultrasound
  • A [[dog whistle]], which emits sound in the ultrasonic range, used to train dogs and other animals
  • Schematic of bench and industrial-scale ultrasonic liquid processors
  • Principle of an active sonar
  • spline]] cracking
  •  Principle of flaw detection with ultrasound. A void in the solid material reflects some energy back to the transducer, which is detected and displayed.
  • Approximate frequency ranges corresponding to ultrasound, with rough guide of some applications

ultrasonics         
¦ plural noun
1. [treated as sing.] the science and application of ultrasonic waves.
2. [treated as sing. or plural] ultrasound.
ultrasonic         
¦ adjective of or involving sound waves with a frequency above the upper limit of human hearing.
Derivatives
ultrasonically adverb
Picosecond ultrasonics         
Picosecond Ultrasonics
Picosecond ultrasonics is a type of ultrasonics that uses ultra-high frequency ultrasound generated by ultrashort light pulses. It is a non-destructive technique in which picosecond acoustic pulses penetrate into thin films or nanostructures to reveal internal features such as film thickness as well as cracks, delaminations and voids.

Wikipédia

Ultrasound

Ultrasound is sound with frequencies greater than 20 kilohertz. This frequency is the approximate upper audible limit of human hearing in healthy young adults. The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz.

Ultrasound is used in many different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is often used in medicine. In the nondestructive testing of products and structures, ultrasound is used to detect invisible flaws. Industrially, ultrasound is used for cleaning, mixing, and accelerating chemical processes. Animals such as bats and porpoises use ultrasound for locating prey and obstacles.