Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short...

Power in a Three-Phase Circuit

Power in a Three-Phase Circuit

Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...

Three-Phase Short Circuit—Unloaded Synchronous Machine

Three-Phase Short Circuit—Unloaded Synchronous Machine

Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...

$Influence of Earth's Curvature and Atmospheric Refraction on Leveling$ 01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.

Intensity Of Electromagnetic Waves

Intensity Of Electromagnetic Waves

The energy transport per unit area per unit time, or the Poynting vector, gives the energy flux of an electromagnetic wave at any specific time. For a plane electromagnetic wave with E0 and B0 as the peak electric and magnetic fields and traveling along the x-axis, the time-varying energy flux can be given by the following equation:

Line Protection with Impedance Relays

Line Protection with Impedance Relays

Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
Under normal conditions, low load currents keep the measured...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Phase imaging and analysis of the annihilation of a dislocation at a crystal surface.

Micron (Oxford, England : 1993)·2025

Same author

Diffracted beam interferometry - Differential phase contrast image of an amorphous thin film material.

Micron (Oxford, England : 1993)·2022

Same author

A high angle scattering, stable amorphous metal TEM specimen for measuring the information envelop of electron microscopes.

Micron (Oxford, England : 1993)·2019

Same author

Acid-treated Fe-doped TiO<sub>2</sub> as a high performance photocatalyst used for degradation of phenol under visible light irradiation.

Journal of environmental sciences (China)·2019

Same author

Coherence of k-space electrons: application to TDS electrons by DBI.

Microscopy (Oxford, England)·2013

Same author

Measurements validating the confocal scanning laser holography microscope.

Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·2011

Search research articles

Related Experiment Video

Updated: Jul 12, 2025

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

Measuring Power of Earth Disturbances Using Radio Wave Phase Imager.

Radwan N K Sharif¹, Rodney A Herring²

¹Department of Mechanical Engineering, MENG, University of Victoria, Victoria, BC V8W 2Y2, Canada.

Journal of Imaging

|October 27, 2023

Summary

This summary is machine-generated.

Ionospheric waves, or disturbances, are measured using a radio wave phase imager. This study found that power generated by local electricity consumers is captured by the ionosphere, not lost.

Keywords:

ionospheric waves phase imaging method with wavevectors power stations radio wave imager software-defined radio transmission line losses

More Related Videos

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Related Experiment Videos

Last Updated: Jul 12, 2025

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

Published on: June 25, 2021

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

Published on: July 30, 2020

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Tracking Infiltration Front Depth Using Time-lapse Multi-offset Gathers Collected with Array Antenna Ground Penetrating Radar

Published on: May 1, 2018

Area of Science:

Geophysics
Atmospheric Science
Radio Science

Background:

Ionospheric waves, also known as ionospheric disturbances, exhibit complex patterns influenced by solar, geomagnetic, meteorological, and anthropogenic activities.
Previous research characterized ionospheric wave properties like energy and wave vector using phase images from the Long Wavelength Array (LWA).

Purpose of the Study:

To directly measure the power of ionospheric waves using their phase shift.
To investigate the energy transfer from terrestrial power consumption to the ionosphere.

Main Methods:

Utilized a radio wave phase imager and software-defined radio (SDR) with the Long Wavelength Array (LWA) at the New Mexico Observatory.
Processed radio carrier wave data to generate phase and amplitude images, with phase images revealing ionospheric waves.
Measured the power and power density of the strongest set of ionospheric waves originating from a major local power consumer.

Main Results:

The strongest ionospheric waves measured had a power of 15.3 W and a power density of 0.018 W/m².
The calculated power density from local power generating stations matched the experimentally measured value.
Phase images successfully revealed ionospheric waves, while amplitude images did not.

Conclusions:

The study demonstrates that electrical power generated and consumed locally is captured by the ionosphere.
This finding suggests a direct link between human energy consumption and ionospheric wave phenomena.
The research validates the use of radio wave phase imaging for quantifying ionospheric wave power.