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Related Concept Videos

Calculation of Self-inductance01:29

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...
Self-Inductance01:24

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...
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.
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...
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.
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.

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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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Force measurement using an inductively coupled sensor.

H A Ashworth1, J R Milch

  • 1Department of Physics, Princeton University, Princeton, NJ 08540, USA.

The Review of Scientific Instruments
|November 1, 1978
PubMed
Summary
This summary is machine-generated.

This study introduces a novel force sensor with high bandwidth and low compliance. It achieves high resolution by measuring quartz plate bending via oscillator frequency changes, enabling precise force detection.

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Area of Science:

  • Physics
  • Engineering
  • Materials Science

Background:

  • Accurate force measurement is crucial in various scientific and engineering applications.
  • Existing force sensors often face limitations in bandwidth, compliance, or resolution.
  • Development of advanced sensing technologies is essential for progress in fields like robotics and biomechanics.

Purpose of the Study:

  • To develop and characterize a novel low-compliance, high-bandwidth force sensor.
  • To demonstrate the sensor's capability for precise force detection using a unique transduction mechanism.
  • To establish the performance metrics, including resolution and bandwidth, of the developed sensor.

Main Methods:

  • A quartz plate was employed as the sensing element, designed for low compliance.
  • Bending of the quartz plate was transduced into an analog voltage signal.
  • A phase-locked loop (PLL) circuit was utilized to measure frequency changes in inductively coupled oscillators, correlating these to plate deformation.
  • The sensor's resolution and bandwidth were experimentally determined.

Main Results:

  • The developed force sensor exhibits a low-compliance and high-bandwidth (approximately 1 kHz) performance.
  • A high resolution of approximately 10(-5) N was achieved.
  • The phase-locked loop method effectively converted mechanical bending into a measurable electrical signal.

Conclusions:

  • The described force sensor offers a promising solution for applications requiring precise and rapid force measurements.
  • The novel transduction method utilizing oscillator frequency changes provides a sensitive and robust sensing mechanism.
  • This technology has potential applications in advanced robotics, haptic feedback systems, and precision measurement instrumentation.