What is magnetostriction oscillator?
What is magnetostriction oscillator?
: an electric oscillator in which the frequency is controlled by the mechanical vibrations induced in a body by magnetostriction.
What is an oscillating ventilator?
High-frequency oscillatory ventilation (HFOV) is a lung-protective strategy that can be utilized in the full spectrum of patient populations ranging from neonatal to adults with acute lung injury. HFOV is often utilized as a rescue strategy when conventional mechanical ventilation (CV) has failed.
What is magnetostriction effect draw the diagram of magnetostriction oscillator and explain its working?
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 are the disadvantages of magnetostriction oscillator?
They frequency o oscillation depends upon the temperature. Breadth o the resonance curve is large. It is due to vibrations of elastic constants of ferromagnetic material with the degree of magnetization. So we cannot get a constant single frequency.
Which principle law is used in magnetostriction oscillator?
8. What is the principle behind the magnetostriction oscillator or what is called as magnetostriction effect? Magnetostriction effect is the principle of producing ultrasonic waves by using the magnetostriction oscillator.
What are the conditions for oscillator?
To start the oscillations, the total phase shift of the circuit must be 360° and the magnitude of the loop gain must be greater than one. Here, bridge does not provide phase shift at oscillating frequency as one arm consists of lead circuit and other arm consists of lag circuit.
How ultrasonic waves can be produced?
Crystals of materials such as quartz vibrate very fast when electricity is passed through them—an effect called “piezoelectricity.” As they vibrate, they manipulate the air around them and the fluids they come in contact with, producing ultrasound waves.
Why can’t humans hear ultrasound waves?
Humans. The upper frequency limit in humans (approximately 20 kHz) is due to limitations of the middle ear. Auditory sensation can occur if high‐intensity ultrasound is fed directly into the human skull and reaches the cochlea through bone conduction, without passing through the middle ear.
Which material is used in magnetostriction oscillator?
A magnetostriction oscillator consists of a core of magnetostrictive material (nickel, special alloys, ferrites, and so on) and a winding.
What are the advantages of a magnetostriction generator?
The principle advantage of magnetostriction generator is the simplicity and low cost of construction. Further of low ultrasonic frequencies, large power output is possible without the risk of damage of the oscillatory circuit system even under temporary over-load. The main drawbacks are : upper limitation of frequency,
What is the circuit diagram of magnetostriction ultrasonic generator?
The circuit diagram of magnetostriction ultrasonic generator is as shown in the figure1.3.2. A short permanently magnetized nickel rod is clamped in the middle between two knife edges. A coil L1 is wound on the right hand portion of the rod. C is a variable capacitor. L1 and C1 form the resonant circuit of the collector-tuned oscillator.
What kind of power does a magnetostriction oscillator produce?
Magnetostriction Oscillators are mechanically rugged. The construction cost is low. They are capable of producing large acoustical power with fairly good efficiency. It can produce frequencies up to 3MHz only. They frequency o oscillation depends upon the temperature. Breadth o the resonance curve is large.
What is the principle of the magnetostriction method?
Magnetostriction method: Principle: The general principle involved in generating ultrasonic waves is to cause some dense material to vibrate very rapidly. The vibrations produced by this material than cause air surrounding the material to begin vibrating with the same frequency.