ultrasound wikipedia - EAS
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Ultrasound - Wikipedia
Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz
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Xem thêmAcoustics, the science of sound, starts as far back as Pythagoras in the 6th century BC, who wrote on the mathematical properties of stringed instruments. Echolocation in bats was discovered by Lazzaro Spallanzaniin
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Xem thêmUltrasound is defined by the American National Standards Institute as "sound at frequencies greater than 20 kHz". In air at atmospheric pressure, ultrasonic waves have
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Xem thêmHumans
The upper frequency limit in humans (approximately 20 kHz) is due to limitations of the middle ear. Auditory sensationcan...
Xem thêmThe potential for ultrasonic imaging of objects, with a 3 GHz sound wave producing resolution comparable to an optical image, was
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Xem thêmAcoustic microscopyis the technique of using sound waves to visualize structures too small to be resolved by the human eye. Frequencies up to several
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Xem thêmHigh-power applications of ultrasound often use frequencies between 20 kHz and a few hundred kHz. Intensities can be very high; above 10 watts per
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Xem thêmNon-contact sensor
An ultrasonic level or sensing system requires no contact with the target. For many processes in the medical, pharmaceutical, military and general industries this is an advantage over inline sensors that may...
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