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Self-Inductance

Self-Inductance

Mutual inductance arises when a current in one circuit produces a changing magnetic field that induces an emf in another circuit. On the other hand, self-inductance arises when the current passing through the circuit changes, creating a changing magnetic flux, resulting in inductance in the same circuit.
Consider a circuit connected to an AC source. As the current varies with time, the magnetic flux through the circuit correspondingly changes. Faraday's law tells us that an emf would therefore...

Calculation of Self-inductance

Calculation of Self-inductance

The self-inductance of a circuit, often simply called the inductance, is a purely geometric factor that depends only on the circuit component's structure. More specifically, it depends on the shape and size of the component that lets the flux pass through it, thus inducing an electric field that opposes any current passing through it.
Since the effect of the induced electric field and the back EMF generated depends on the rate of change of current and the self-inductance, the inductance...

Magnetic Field Of A Current Loop

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.

Inductors

Inductors

An inductor is a passive component built to store energy within its magnetic field. It can be fabricated by coiling a wire around a magnetic core. When current is permitted to flow through this inductor, it is observed that the voltage across the inductor is directly proportional to the time rate of change of the current. Mathematically,

Inductors

Inductors

An inductor, also known as a choke, is a circuit component created to have a specific inductance. Inductors are among the crucial circuit components used in modern electronics, along with resistors and capacitors. They serve as a barrier against changes in a circuit's current. An inductor tends to suppress current changes in an alternating-current circuit that are faster than desired. In a direct-current circuit, an inductor aids in preserving a constant current despite changes in the applied...

Inductor in an AC Circuit

Inductor in an AC Circuit

The basic components of an inductor are coils or loops of wire that are either wound around a hollow tube former or a ferromagnetic material (iron-cored) to increase their inductive value or inductance. When a voltage is applied across an inductor's terminals, a magnetic field is created, where the inductor stores its energy. The inductor's own self-induced or back emf value controls the growth of the current flowing through it. This back emf voltage is proportional to the rate of variation of...

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Self-integrating inductive loop for measuring high frequency pulses.

Mónica V Rojas-Moreno¹, Guillermo Robles, Juan M Martínez-Tarifa

¹Departamento de Ingeniería Eléctrica, Universidad Carlos III de Madrid, Madrid, Spain. mvrojas@ing.uc3m.es

The Review of Scientific Instruments

|September 8, 2011

Summary

This summary is machine-generated.

This study introduces a new inductive sensor for measuring high-frequency current pulses. The self-integrating sensor offers non-contact measurement, protecting equipment and providing accurate results.

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Area of Science:

Electrical Engineering
Electromagnetism
Sensor Technology

Background:

Inductive sensors enable non-contact measurement of high-frequency pulses.
Non-contact methods protect sensitive measuring equipment.
Accurate measurement of rapidly varying currents is crucial in various applications.

Purpose of the Study:

To implement and validate a novel inductive sensor for measuring rapidly varying currents.
To demonstrate the sensor's ability to provide an output proportional to current pulses.
To assess the sensor's performance against established measurement techniques.

Main Methods:

Design of a rectangular inductive loop with a terminal resistor.
Application of Faraday's law to relate the loop's output to the current derivative.
Modification of the frequency response using the resistor for current proportionality.
Validation using a non-inductive resistor and a commercial high-frequency current transformer.

Main Results:

The implemented inductive sensor successfully measured high-frequency current pulses.
The sensor's output was shown to be proportional to the current pulse.
Comparison with validation sensors highlighted the probe's advantages and drawbacks.
The self-integrating inductive sensor proved to be an adequate inductive transducer.

Conclusions:

The developed self-integrating inductive sensor is effective for measuring rapidly varying currents.
Non-contact measurement capability offers significant advantages in protecting equipment.
The sensor design provides a viable alternative for high-frequency current monitoring.