ULTRASONICS AND ITS APPLICATIONS.pptx
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SONAR uses ultrasonic waves to detect objects underwater. A transmitter sends ultrasonic waves into the water which reflect off objects and return to a receiver. The receiver converts the waves into electrical signals that are analyzed to determine underwater conditions and obstacles. Ultrasonic welding is a process that joins materials without melting them by applying high-frequency vibrations that cause sliding and heat from friction, enabling fast welding within 1 second.
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This document discusses ultrasonic waves and methods for their production. It provides details on two main production methods: magneto-striction and piezo-electric. Magneto-striction uses a ferromagnetic rod subjected to an alternating magnetic field to produce vibrations. Piezo-electric uses crystals like quartz that produce electricity when pressure is applied, allowing for vibrations. The document also briefly explains how sonar uses ultrasonic waves to detect underwater objects by timing beam emission and reflection.
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ULTRASONICS AND ITS APPLICATIONS.pptx
- 11. SONAR (Sound navigation and ranging)
- 13. WORKING OF SONAR SONAR works using ultrasonic waves. A transmitter and receiver are used in SONAR techniques. The whole device has been loaded into the ship. Ultrasonic waves or ultrasound are generated by the transmitter. These waves travel across water. Waves pass through water and hit objects submerged or on the seabed. These waves are reflected by objects or the seabed after they strike. As a result, the receiver collects these waves. The ultrasonic waves are then converted into electrical signals, which are studied to determine underwater conditions and obstacles.
- 16. Ultrasonic welding • Ultrasonic welding is a solid-state welding process in which joining of materials (metals and plastics) occur without melting. In ultrasonic welding, high-frequency mechanical vibrations are transferred to the parts to be joined, which cause sliding one part over another. The joining occurs as a result of heat generated by friction and severe plastic deformation. Ultrasonic welding is the fastest welding technique with a weld time of ranges from 0.1 to 1 s.
- 17. THANK YOU