Piezoelectric Effect, Piezoelectric Oscillator Working, Production of Ul...

PIEZOELECTRIC EFFECT -- PRODUCTION OF ULTASONIC WAVES

When an AC Voltage is applied across a piezoelectric crystal such as Quartz Crystal, It vibrates at the frequency of the applied voltage. Vibration of maximum amplitude occurs at the natural resonant frequency of the crystal which is determined by physical dimension and by the way the crystal is cut. The Frequency is given by .......

Piezoelectric Effect, Piezoelectric Oscillator Working, Production of Ul...

PIEZOELECTRIC EFFECT -- PRODUCTION OF ULTASONIC WAVES

When an AC Voltage is applied across a piezoelectric crystal such as Quartz Crystal, It vibrates at the frequency of the applied voltage. Vibration of maximum amplitude occurs at the natural resonant frequency of the crystal which is determined by physical dimension and by the way the crystal is cut. The Frequency is given by ...

Fundamental of Ultrasonic Waves, Production of Ultrasonic Waves, Ultraso...

ULTRASONIC WAVES -- THEORY OF ULTRASONIC WAVES

Waves in nature are of two types, Mechanical and Electromagnetic. Mechanical waves are longitudinal in nature and require a medium for its's propagation. Electromagnetic waves are transverse in nature and do not requires a material medium for their propagation. Sound waves are mechanical in nature.
Sound waves are classified according to the frequency range. Sound waves having frequency less than 20 Hz are known as infrasonic waves. Waves having frequency between 20 Hz and 20000 Hz lie in audible sound. Sound waves having frequency higher than human audible range or sound waves having frequency above 20 Hz are known as Ultrasonic waves or Supersonic Waves.

Magnetostriction Effect, Magnetostriction Oscillator Working, Production...

MAGNETOSTRICTION EFFECT -- PRODUCTION OF ULTRASONIC WAVES

When a rod of ferromagnetic material is kept in magnetic field parallel to its length the rod suffer a change in its length. The change in length is independent of the direction of magnetic field. This phenomenon is known as Magnetostriction.
If the magnetic field is alternating and has frequency equal to the natural frequency of the rod, a large amplitude longitudinal vibration can be set up. The frequency of Oscillation is ...