Electromagnetic Field (EMF) Monitoring Articles

  • What is a Spectrometer?

    The characteristics of a white LED light differs greatly, when compared to a yellow CFL. Without any special tools, one can see that the LED emits a clear white color, while the CFL generates yellow light. Going one step further, using a spectrometer, one will be able to “dissect” the light sources and see that they are composed of other colors in the visible light spectrum, such as ...


    By Larson Electronics LLC

  • Measuring IR Light and Near-IR Light

    Infrared (IR) light emits a broad range of non-visible wavelengths in the electromagnetic spectrum. Applications for infrared, including near-infrared, are defined by the respective IR bands during output. For example, LIDAR (Light Detection and Ranging) equipment uses 1,000 nm and 1,550 nm IR bands while surveying an area. In the military sector, 850 nm, 1,060 nm and 1,500 nm (and up) are used ...


    By Larson Electronics LLC

  • Use of Electromagnetic Induction Tools in salinity assessment/appraisals in eastern Colorado

    Abstract Electromagnetic induction (EMI) is a relatively low-cost and rapid method for measuring, assessing spatially soil salinity. The two studies were conducted to evaluate data obtained with a single-frequency (EM38 meter) and multi-frequency (GEM300 sensor) EMI instruments and to relate apparent conductivity measured by these instruments with the more conventional conductivity of the ...


    By Geonics Limited

  • UXO discrimination using time domain electromagnetic induction

    Introduction An explosive ordnance is a munition that is either launched or fired with the intent of detonation at a specified target. An unexploded ordnance (UXO) is an explosive ordnance that, due to some malfunction, remains undetonated. As a result, the ordnance can be found at the ground surface, partially buried, or buried at a depth of up to 8 m beneath the surface. Practical and ...


    By Geonics Limited

  • Ferrography Made Easy With The FerroCheck 2000

    The measurement and trending of abnormal ferrous wear debris in machinery lubrication oils is arguably the most significant indicator of machinery health and a key predictor of catastrophic machinery failure. There are several methods available to measure the ferrous content of lubrication oil. ...


    By Spectro Scientific

  • Port of London Authority Tidal Monitoring System - POLATIDE 5: High Level - Case Study

    Background: Valeport recently worked with marine data specialists, Oceanwise, to design and deliver a complete tidal monitoring system for the Port of London Authority (POLA), please read on to find out more about the system referred to as ‘POLATIDE 5’. Introduction: Valeport and OceanWise ...


    By Valeport Ltd

  • The importance of including the natural variability of lightning strength in assessment of thunderstorm range uncertainty

    A method of estimating lightning distance from a single-site lightning detector is to measure the change in electrostatic field produced by the lightning strike. This can be measured directly using slow-response antennas or indirectly by identifying features of the electromagnetic (radio) signal. Other techniques are used, but tend to suffer from increased range uncertainty due to increased ...

  • Mitigation of marine biofouling on tubes of open rack vaporizers using electromagnetic fields

    This study quantitatively evaluates the antifouling action of the continuous physical treatment with electromagnetic fields (EMFs) of seawater used as heat exchanger fluid in an open rack vaporizer (ORV) pilot plant to reduce the growth of biofouling on external rib-tube surfaces. The results demonstrate that the biofilm adhered on the treated rib-tubes was reduced by 33% in thickness and by ...


    By IWA Publishing

  • Locate buried monitoring wells case study

    A Phase II Environmental Site Investigation was being conducted at a gasoline station in Fort Myers, Florida. In order to minimize costs, our client intended to use several existing on-site monitoring wells rather than installing new wells. However, five of the existing wells had been covered with asphalt and were no longer visible. GeoView was tasked with performing a shallow geophysical study ...


    By GeoView, Inc.

  • Pre-Colombian artifacts case study

    Cordillera de Mérida mountain range, Northeastern Colombia A pipeline is planned to transport oil from the Cordillera de Mérida mountain range of northeastern Colombia west towards the Pacific Ocean. An archeological investigation is being conducted by others along the proposed pipeline route to determine potential areas of historical significance. As part of ...


    By GeoView, Inc.

  • Buried debris case study

    Saufley Field, Escambia County, Florida GeoView was tasked with performing a geophysical investigation at a military base in the southeastern United States. The purpose of the investigation was to locate a reported debris burial pit. The burial pit was reported to be 60 feet (ft) in length and up to 10 ft deep. Historical records indicated that the pit  contained buried drums and ...


    By GeoView, Inc.

  • Obtaining the magnetic characteristics of 3/4 salient–pole brushless DC machine from 3–D FEM analysis

    This paper deals with accurate electromagnetic field analysis of 3/4 salient–pole structure brushless DC generator (BLDG) with concentrated stator winding, which does not use a permanent magnet in the rotor. The permanent magnet is replaced with assisted field coil in the rotor. To evaluate the generator performance the numerical technique has been utilised. In the numerical analysis, 3–D finite ...


    By Inderscience Publishers

  • Electromagnetic (EMI) surveys

    EMI (EM-34) surveyDesigned and performed an EM-34 soil conductivity (soil mapping) survey of a 26-acre wood-waste landfill in Omak, Washington.  This soil mapping survey was designed to detect buried drums at a depth of 60 feet and was augmented by a total-field magnetometer survey. While employed with the Arkansas Department of Environmental Quality (ADEQ), performed approximately 40 ...


    By ECA Geophysics

  • Reaching underground resources

    Accessing critical resources such as geothermal energy and natural gas requires drilling — an expensive, energy-intensive, messy process with today's technology. An MIT team has been looking into a more elegant approach. Instead of grinding rock to bits, they would use a continuous beam of energy to vaporize it and then blow out the tiny particles that form with a high-pressure stream of ...

  • New EU RoHS finally here – significant changes for EEE on the horizon

    After three years of debate, the revised RoHS Directive (65/2011/EU) has finally been adopted by the European Parliament and the Council resulting in significant changes  for electrical and electronic equipment. In 2008, the European Commission launched the review of the related directives of WEEE, addressing  the collection and recycling of electrical and electronic equipment (EEE), ...

  • Vibrating feeders for stockpiling and reclaim

    The expanding applications of vibratory feeders for controlling the flow of bulk materials, and their adaptation for processing requirements, have developed considerable interest in stockpiling and reclaim systems. The general design of these units consists of a material transporting trough, or platform, driven by a vibratory force system. The flexibility and variety of designs is limited only by ...


    By General Kinematics

  • TRaC UK – LDS V984 vibration testing of fuel probes for the V22 Osprey

    The Partnership Founded in 1934 as Flight Refuelling Limited (FRL), Cobham plc is a British manufacturing company based in Wimborne Minster, Dorset, England. It is organised into four core technology divisions – Mission Systems, Defence Systems, Avionics and Surveillance, and Aviation Services. The Cobham Mission Systems Division claims to be the world market leader for air-to-air ...

  • Monitoring the magnetic field in houses under 50 Hz high-voltage overhead transmission lines

    This paper deals with a one-week monitoring of the 50 Hz magnetic field on the ground floor and the first floor of houses under 150, 220 and 380 kV high-voltage overhead three-phase AC transmission lines. The field strength varied with the current intensity, the conductor height, and the storey of the house. Because current intensity varies with time the magnetic field depended on the time of day ...


    By Inderscience Publishers

  • Contemporary approach to determination of magnetic induction in wind generator air gap

    Abstract The paper describes a system for measuring of magnetic induction on the wind generating unit. The manner of operation and the application of the Hall effect probe are detailed. Dynamic electromagnetic field computing results are shown through application of MKE on the synchronous generator model installed in a windmill unit and compared to the actual metering results. Two subsequent ...

  • Environment and Health

    Public concerns, evidence from research and increasing scientific knowledge are all driving widespread discussions on environment and health problems. The issue of environment and health is characterised by multi-causality with different strengths of association. This means that the links between exposures and their health consequences depend on the environmental pollutants and diseases being ...

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