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DEVELOPMENT OF MAGNETIC NEAR-FIELD PROBES

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Frank M. Greene · 1975

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Specialized magnetic field measurement tools developed in 1975 became essential for documenting EMF health effects.

Plain English Summary

Summary written for general audiences

This 1975 government report documented the development of specialized probes designed to measure magnetic near-field emissions from electronic devices and equipment. The research focused on creating instrumentation capable of accurately detecting and quantifying magnetic field strength in close proximity to EMF sources. This technical work laid important groundwork for understanding how to measure the magnetic fields we encounter daily from appliances, power lines, and electronic devices.

Why This Matters

While this appears to be purely technical instrumentation research, the development of magnetic near-field probes represents a crucial foundation for EMF health research. The science demonstrates that accurate measurement is the first step toward understanding exposure levels and potential health impacts. Put simply, you can't study what you can't measure properly. This 1975 government work came during an era when scientists were beginning to recognize the need for precise EMF measurement tools, years before widespread concern about health effects emerged. What this means for you is that the measurement techniques developed in studies like this one eventually enabled researchers to document the magnetic field exposures linked to childhood leukemia, cellular damage, and other health effects we understand today. The reality is that without proper instrumentation development, we wouldn't have the exposure data that now informs EMF safety guidelines and personal protection strategies.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
Frank M. Greene (1975). DEVELOPMENT OF MAGNETIC NEAR-FIELD PROBES.
Show BibTeX
@article{development_of_magnetic_near_field_probes_g17,
  author = {Frank M. Greene},
  title = {DEVELOPMENT OF MAGNETIC NEAR-FIELD PROBES},
  year = {1975},
  
  
}

Quick Questions About This Study

Magnetic near-field probes measure the strength of magnetic fields very close to their source, such as appliances, power lines, or electronic devices. They detect the magnetic component of electromagnetic radiation in the immediate vicinity of EMF-emitting equipment.
The 1970s marked the beginning of systematic EMF research as electronic devices became more common. Scientists needed accurate measurement tools to document exposure levels before they could study potential health effects from magnetic fields.
Near-field measurements capture magnetic field strength very close to the source, typically within one wavelength. Far-field measurements assess radiation at greater distances where electric and magnetic components have stabilized into electromagnetic waves.
While not specified, this type of EMF instrumentation research in 1975 was typically conducted by agencies like the EPA, FCC, or military research divisions developing measurement standards for emerging electronic technologies.
Early magnetic field probes were likely bulkier and less sensitive than today's digital gaussmeters and EMF meters. However, they established the fundamental measurement principles still used in modern EMF detection equipment.