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Related Concept Videos

Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed to be a...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Determining Electric Field From Electric Potential01:12

Determining Electric Field From Electric Potential

The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
Calculation of Electric Flux01:25

Calculation of Electric Flux

Consider the electric field of an oppositely charged, parallel-plate system and an imaginary box between those plates. Let the bottom face of the box be ABCD, and the top face be FGHK. The electric field between the plates is uniform and points from the positive plate toward the negative plate. The calculation of this field's flux through the box's various faces shows that the net flux through the box is zero. Why does the flux cancel out here?
Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the positive...

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Related Experiment Video

Updated: May 13, 2026

Lens-free Video Microscopy for the Dynamic and Quantitative Analysis of Adherent Cell Culture
09:04

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Published on: February 23, 2018

Kalman filtering techniques for focal plane electric field estimation.

Tyler D Groff1, N Jeremy Kasdin

  • 1Department of Mechanical and Aerospace Engineering, EQuad, Olden Street, Princeton, New Jersey 08544, USA. tgroff@princeton.edu

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|March 5, 2013
PubMed
Summary

A new Kalman filter estimator reduces the number of exposures needed for coronagraph wavefront control. This method improves exoplanet detection by stabilizing image-based electric field estimation.

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Last Updated: May 13, 2026

Lens-free Video Microscopy for the Dynamic and Quantitative Analysis of Adherent Cell Culture
09:04

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Published on: February 23, 2018

Determining 3D Flow Fields via Multi-camera Light Field Imaging
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Published on: March 6, 2013

Evaluating Targeting Accuracy in the Focal Plane for an Ultrasound-guided High-intensity Focused Ultrasound Phased-array System
08:08

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Published on: March 6, 2019

Area of Science:

  • Astronomy and Astrophysics
  • Optical Engineering

Background:

  • Coronagraphs require advanced focal plane wavefront control for exoplanet detection.
  • Current methods necessitate numerous images for electric field estimation, disrupting science observations.

Purpose of the Study:

  • To develop a more efficient method for estimating the electric field in coronagraph systems.
  • To reduce the number of required exposures for wavefront control algorithms.

Main Methods:

  • Demonstration of a Kalman filter estimator incorporating prior knowledge.
  • Utilizing prior state estimate history for electric field estimation.

Main Results:

  • Dramatically reduced number of exposures needed for image plane electric field estimation.
  • Stabilized suppression performance against poor signal-to-noise ratios.
  • Comparison of Kalman filter performance against non-history-based estimation schemes.

Conclusions:

  • The Kalman filter estimator significantly improves efficiency in coronagraph wavefront control.
  • This method enhances robustness and reduces estimation errors.
  • The developed filter paves the way for adaptive algorithms for optical train parameter estimation.