sound class ix
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this ppt is based on class ix chapter sound

this ppt is based on class ix chapter sound

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sound class ix Presentation Transcript

  • 1. •Topics covered • • Range of hearing Ultrasound Infrasound Applications of Ultrasound Ultrasonics • Diagrams
  • 2. Range Of Hearing Ultrasound • Ultrasound is an oscillating sound pressure wave with a frequency greater than the upper limit of the human hearing range. • Ultrasound is thus not separated from 'normal' (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. • Although this limit varies from person to person, it is approximately 20 kilohertz
  • 3. Ultrasonics is the application of ultrasound. Ultrasound can be used for medical imaging, detection, measurement and cleaning. • At higher power levels, ultrasonics is useful for changing the chemical properties of substances • The potential for ultrasonic imaging of objects, was recognized by Sokolov in 1939 but techniques of the time •
  • 4. The potential for ultrasonic imaging of objects, was recognized by Sokolov in 1939 but techniques of the time produced relatively low-contrast images with poor sensitivity. • The power density is generally less than 1 watt per square centimetre, to avoid heating and cavitation effects in the object under examination. • High power applications of ultrasound often use frequencies between 20 kHz and a few hundred kHz. Intensities can be •
  • 5. • Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. • Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is emitting pulses of sounds
  • 6. Sonar may also be used in air for robot navigation. The term sonar is also used for the equipment used to generate and receive the sound. • The acoustic frequencies used in sonar systems vary from very low (infrasonic) to extremely high (ultrasonic). •
  • 7. The detection, classification and localisation performance of a sonar depends on the environment and the receiving equipment, as well as the transmitting equipment in an active sonar or the target radiated noise in a passive sonar. • The sound reflection characteristics of the target of an active sonar, such as a submarine, are known as its target strength. • A complication is that echoes are also obtained from other objects in the sea such as •
  • 8. •Ultrasound Scanner
  • 9. •SONAR
  • 10. Uses Of Ultrasonic Waves