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Related Concept Videos

Faraday's Law01:10

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...
Faraday Disk Dynamo01:23

Faraday Disk Dynamo

A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Magnetic Field Of A Current Loop01:16

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.
Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.

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Design, Instrumentation and Usage Protocols for Distributed In Situ Thermal Hot Spots Monitoring in Electric Coils using FBG Sensor Multiplexing
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Fiber Faraday circulator or isolator.

E H Turner1, R H Stolen

  • 1Bell Laboratories, Holmdel, New Jersey 07733, USA.

Optics Letters
|August 25, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel Faraday circulator/isolator using birefringent fiber and permanent magnets. This fiber optic device offers a new approach for optical isolation and circulation applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science

Background:

  • Faraday circulators and isolators are crucial components in optical systems.
  • Traditional devices often involve bulky or complex magnetic field generation.

Purpose of the Study:

  • To demonstrate a compact and potentially cost-effective Faraday circulator/isolator.
  • To utilize birefringent fiber as the active medium for optical isolation.

Main Methods:

  • Fabrication of circulators using silica-core, single-mode, birefringent fiber.
  • Employment of small permanent magnets to generate the required magnetic field.
  • Testing devices at wavelengths of 632.8 nm and 830 nm with approximately 2 m of fiber.

Main Results:

  • Successful construction of working Faraday circulators/isolators in birefringent fiber.
  • Demonstration of devices operating at visible and near-infrared wavelengths.
  • Initial investigation into the bandwidth and temperature dependence of the fiber-based devices.

Conclusions:

  • Birefringent fiber is a viable and novel medium for creating Faraday circulators and isolators.
  • This approach offers a potentially simpler and more compact alternative to existing technologies.
  • Further characterization of bandwidth and temperature stability is warranted for practical applications.