Physical units to report intensity of electromagnetic wave

Authors: R Ramirez-Vazquez, I Escobar, T Franco, E Arribas

Year: 2021 Nov 2

Category: Environmental Research

Journal: Environ Res

DOI: 10.1016/j.envres.2021.112341

URL: https://pubmed.ncbi.nlm.nih.gov/34740620/

Abstract

Overview

The study aims to provide a unified methodology for reporting the intensity of electromagnetic waves, addressing inconsistencies in measurement units used within the scientific community.

Findings

  • The current practice shows a division: some researchers use Watts per square meter (W/m2) while others prefer Volts per meter (V/m).
  • The study advocates for the use of W/m2, referring to it as 'wave intensity' instead of 'power flux density' from a physics standpoint.
  • A critical observation made is the quadratic relationship between the electric field and the intensity of the wave, necessitating complex calculations.
  • For precision, when intensities are low, they should be reported in microwatts per square meter (μW/m2) limited to three significant figures, which matches the current sensitivity of exposimeters.

Conclusion

Standardizing the measurement unit to W/m2 for electromagnetic wave intensity is recommended to enhance clarity and accuracy in the field's data reporting systems.

electromagnetic waves exposimeters W/m2 V/m measurement physics sensitivity
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