Threshold evaluation of electric field perception using optical telemetry technique

Masaji Yamashita, Koichi Shimizu, Goro Matsumoto

Research output: Contribution to journalArticle


An optical telemetry technique was developed which enables us to evaluate physiological responses non-invasively without restraining the subject. The change in diameters of peripheral blood vessels is measured as the change in transmitted intensity of infra-red light across an ear auricle. The signal is transmitted to a remote place using infra-red light diffusely reflected from a ceiling and walls of a room. After the feasibility of this technique was verified with various stress-responses, it was applied to the study of biological effects of electromagnetic fields. A rabbit was exposed to a strong electric field, and the change in its peripheral circulation was detected with this technique. Different field strengths were applied from 5 kV/m - 100 kV/m. Both contraction and dilation of peripheral blood vessels were detected on the exposure to electric fields. The threshold level of the field strength to cause the response was analyzed.

Original languageEnglish
Pages (from-to)230-233
Number of pages4
JournalUnknown Journal
Publication statusPublished - 1994
Externally publishedYes


ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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