How ultrasonics is produced by magnetostriction method experimentally?
By varying the length of rod high frequency oscillations can be obtained. A nickle rod 10 cm long gives out ultrasonic wave of frequency = 24kHz. This is how the ultrasonic waves are produced or generated by magnetostriction method.
How the ultrasonic waves are produced using the magnetostriction?
The rod starts vibrating due to magnetostrictive effect. The vibrations of the rod create ultrasonic waves. The longitudinal expansion and contraction of the rod produces an E.M. in the coil L2. This e.m.f is applied to the base of the transistor.
What are the methods for the production of ultrasonic waves?
Production of Ultrasonic Waves
- Magnetostriction method to produce ultrasonic waves.
- Production of Ultrasonic Waves by Piezoelectric method.
- Quartz Crystal Method.
- Thermal Detection Method.
- Sensitive Flame Method.
- Kundt’s Tube Method.
- Other application of Ultrasonic Waves.
- Application of Ultrasonic Waves in Medical field.
What is magnetostriction effect in ultrasonics?
Magnetostriction effect: When a ferromagnetic rod like iron or nickel is placed in a magnetic field parallel to its length, the rod experiences a small change in its length. This is called magnetostriction effect.
What is produced by using magnetostriction method?
When a magnetic field is applied parallel to the length of a ferromagnetic rod made of material such as iron or nickel, a small elongation or contraction occurs in its length. This is known as magnetostriction.
What is the principle behind magnetostriction oscillator?
It works under the principle of Magnetostriction effect. When a ferromagnetic rod is kept in an alternating magnetic field the rod is set into longitudinal vibrations, this happens due to change in the length of the rod. This longitudinal vibrations, result in the formation of ultrasonic waves at resonance.
What is magnetostriction oscillator?
Definition of magnetostriction oscillator : an electric oscillator in which the frequency is controlled by the mechanical vibrations induced in a body by magnetostriction.
What is principle of magnetostriction method?
What is meant by magnetostriction effect?
Magnetostriction is a property of ferromagnetic materials that causes them to change their shape when subjected to a magnetic field. The effect was first identified in 1842 by James Joule when observing a sample of nickel. This effect can cause losses due to frictional heating in susceptible ferromagnetic cores.
What is magnetostriction in magnetic materials?
Magnetostriction can be defined as the change in dimension of a piece of magnetic material induced by a change in its magnetic state. Generally, a magnetostrictive material changes its dimension when subjected to a change of the applied magnetic field.
What is magnetostriction effect in physics?
Magnetostriction (cf. electrostriction) is a property of magnetic materials that causes them to change their shape or dimensions during the process of magnetization. The variation of materials’ magnetization due to the applied magnetic field changes the magnetostrictive strain until reaching its saturation value, λ.
How is magnetostriction made?
Scientifically, magnetostriction refers to the change in dimensions resulting from the rotation of the saturation magnetization from one crystallographic direction to another in a single crystal. The strains are usually small, typically 10−5, and the standard measuring technique makes use of resistance strain gages.
What is magnetostriction phenomenon?
Introduction. Magnetostriction is defined as ability of a material to experience mechanical strain when subject to a magnatic field (Jack et al., 2015). Magnetostriction is a phenomenon observed in all ferromagnetic materials.
What is magnetostriction physics?
magnetostriction, change in the dimensions of a ferromagnetic material, such as iron or nickel, produced by a change in the direction and extent of its magnetization.
How to produce ultrasonics by magnetostriction?
By varying the length of rod high frequency oscillations can be obtained. A nickle rod 10 cm long gives out ultrasonic wave of frequency = 24kHz. This is how the Production of Ultrasonics by Magnetostriction method.
What is magnetostriction?
This is called Magnetostriction. The charge in length is propotional to the strength of megnetic field. The increase in length is very small in practice. Amongst all ferromagnetic substances, increase in length is maximum for Nickel.
How does a magnetostriction oscillator work?
Working – Magnetostriction Oscillator • When the key is closed, the tank circuit (LC circuit) is set into oscillation with a frequency of vibration given by F= 1/ (2π√ (LC)) where L1 =inductance of coil L1 and C1 =capacitance of the capacitor C1. • An alternating EMF is produced due to the vibration of the tank circuit.
How does a ferromagnetic rod produce ultrasonic waves?
• If the frequency of the tank circuit matches with the frequency of vibration of the ferromagnetic rod, ultrasonic waves are produced and the ultrasonic waves are emitted from the ends of the rod as shown in the diagram.