Oscillator

The free oscillator

A free oscillating is a system undergoing a force which tends to bring back it towards a position of balance around of which it oscillates. It is the case of a oscillating Pendule under the effect of the Gravité.

The forced oscillator

An oscillating forced is a free oscillator to which one adds a oscillating force . A swing is one when one balances his feet in order to make it accelerate. Indeed, this swinging constitutes an additional force which, adapted at the speed of the swing, can make assemble this one more and more high.

Many forced oscillators exist in physics. For example, the radiation of the Sun force the electron S of the Molecule S of the atmosphere to be oscillated. That has as a consequence the blue color of the sky.

The self-sustained oscillator

A self-sustained oscillating uses a continuous energy source, and produces a periodic variation. One meets two types of them, but this distinction is not always clear.

One can in general summarize their mechanism in two principal functions: a profit and a filter . The profit is simply the amplification of the signal permitted by the energy source continues. The filter makes it possible to select some beach of Fréquence S with which the system will oscillate.

The quasi-sinusoidal oscillator

When the periodic variation of a self-sustained oscillator approaches a Sinusoïde, it is said that it is quasi-sinusoidal. That corresponds to a filter of very good quality, i.e. it selects only one frequency. This is why a sinusoid is observed. Whenever the quality of this filter is not also good, this sinusoid can become deformed.

This kind of oscillators often meets in electricity. It is the case of an oscillator with Pont of Wien.

A more unexpected example is that of the Laser. Indeed a laser produces a Light wave sinusoidal. The profit is the amplifying Milieu and the filter is the optical Cavité in which the light makes return tickets.

The oscillator of relieving

If the system passes periodically from a well defined state to another, it is said that it is an oscillating of relieving . That can be obtained, for example, with a quasi-sinusoidal oscillator to which one provides a very high profit which will saturate the sinusoid very quickly. This one takes then the form of Créneau X, which corresponds well in the passing of a state to another periodically.

An astonishing example is the Vase of Tantalum, which, filled continuously by water, is emptied and filled periodically. To include/understand why it is about an oscillator of relieving, a study a little thorough is necessary.

Examples in electronics

Oscillating Circuit RLC
with quartz, OCXO
Chopper
Oscillating Oscillating Colpitts
of Oscillating Van DER pol.
of Duffing

See too

Oscillating electronics
Oscillating traditional harmonic
Oscillating quantum harmonic
oscillating Systems with a degree of freedom
Anharmonicité

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