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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...
Patch Clamp01:18

Patch Clamp

Many fundamental cell functions such as muscle contraction and nerve transmission rely on the electrical signals produced by the movement of positively and negatively charged ions across the cell membrane. One competent method to record current flowing across the whole cell or single ion channel is the patch-clamp technique.
In this method, a glass micropipette containing electrolyte solution is tightly sealed against a small portion of the cell membrane. As a result, a patch of the cell...
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.
Galvanometer01:24

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of  two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform magnetic...
Amperometry: Overview01:10

Amperometry: Overview

Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...

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Faraday effect optical current clamp using a bulk-glass sensing element.

Y N Ning, D A Jackson

    Optics Letters
    |October 6, 2009
    PubMed
    Summary
    This summary is machine-generated.

    A novel openable Faraday current sensor offers high resolution (7.2 mA/√Hz) for measuring currents from 1 to 1500 A. Its clamp-like design allows flexible use in permanent or temporary electrical system diagnostics.

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    Area of Science:

    • Electrical Engineering
    • Physics
    • Sensor Technology

    Background:

    • Accurate current measurement is crucial for electrical system monitoring and diagnostics.
    • Existing Faraday current sensors may lack the flexibility for diverse installation scenarios.

    Purpose of the Study:

    • To present a new topology for an openable Faraday current sensor.
    • To evaluate the performance characteristics of the developed sensor, including its resolution and sensitivity.
    • To highlight the sensor's applicability in various installation and diagnostic settings.

    Main Methods:

    • Fabrication of an openable Faraday current sensor utilizing a novel topology.
    • Experimental setup to measure current sensor resolution and sensitivity.
    • Testing the sensor across a wide current range (1-1500 A).

    Main Results:

    • Demonstrated sensor resolution of 7.2 mA/√Hz.
    • Achieved measurement range from 1 to 1500 A.
    • Measured sensitivity of 2.21 x 10⁻⁵ rad/A.

    Conclusions:

    • The developed openable Faraday current sensor provides high-resolution measurements.
    • The clamp-like, openable design enhances versatility for both permanent installations and diagnostic studies.
    • This sensor technology offers a valuable tool for electrical current monitoring applications.