Home > Ultrasound
Ultrasound is sound with a frequency greater than the upper limit of human hearing, approximately 20 kilohertz. Some animals, such as dogs, dolphins, and bats, have an upper limit that is greater than that of the human ear and thus can hear ultrasound.Ultrasound has industrial and medical applications. Medical ultrasonography can visualise muscle and soft tissue, making them useful for scanning the organs, and obstetric ultrasonography is commonly used during pregnancy. Typical diagnostic ultrasound scanners operate in the frequency range of 2 to 10 megahertz. Powerful ultrasound may also be used to break up kidney stones.
Ultrasonic cleaners, sometimes called supersonic cleaners, are used at frequencies from 20-40 kHz for jewellery, lenses and other optical parts, watchThis page is about timekeeping devices. In naval parlance, watches are a timekeeping convention. The term in general use can mean any period of duty or responsibility, such as a hurricane watch. A watch is a small portable clock that displays the currentes, dental instrument s, surgical instrument s and industrial parts. The main mechanism for cleaning action in an ultrasonic cleaner is actually the energy released from the collapse of millions of microscopic cavitationCavitation is the phenomenon where small cavities of partial vacuum form in fluid then rapidly collapse, producing a sharp sound. Pump Cavitation occurs in pumps, as well as around propellers, or at restrictions in a flowing liquid. Cavitation means that events occurring in the liquid of the cleaner. Home cleaners are available and costs range from approximately US $100.
Ultrasound in applied in specific configurations can produce exotic phenomena such as sonoluminescenceSonoluminescence is the emission of short bursts of light from imploding bubbles in a liquid when excited by sound. History The effect was first discovered at the University of Cologne in 1934 as a result of work on sonar. Frenzel and H. Schultes put an u. These phenomena are being investigated partly because of the possibility of bubble fusionBubble fusion is the common name for a nuclear fusion reaction hypothesized to occur during sonoluminescence, an extreme form of acoustic cavitation. The high temperatures produceable through sonoluminescence raises the possibility that it might be a mean.
Ultrasound generator/speaker systems are sold with claims that they frighten away rodents and insects, but there is no scientific evidence that the devices work; controlled tests have shown that rodents quickly learn that the speakers are harmless.
1 See also
- Dog whistleA dog whistle is a type of whistle used in the training of dogs. The frequency range of a dog whistle is largely out of the range of human hearing. Typically, a dog whistle is within the range of 5800 Hz to 12400 Hz. Some dog whistles have adjustable slid
- InfrasoundInfrasound is sound with a frequency too low to be detected by the human ear (less than approximately 20 hertz). Infrasound is characterized by an ability to cover long distances and get around obstacles with little dissipation. Whales and elephants are k (sound at extremely low frequencies)
- LightLight is electromagnetic radiation with a wavelength that is visible to the eye, or in a more general sense, any electromagnetic radiation in the range from infrared to ultraviolet. The three basic dimensions of light (and of all electromagnetic radiation
- Pelvic ultrasoundA Pelvic ultrasound is one of the major diagnostic tools used to detect Polycystic Ovarian Syndrome and to image the uterus and ovaries or urinary bladder. Ultrasounds are used during pregnancy to check on the development of the fetus. Men are sometimes g
- Physics
- Ultrasound weapons
