| 摘要 |
By using an electric field sensor comprising a sensor head for producing a transmitted light wave having an intensity which varies in dependence upon an intensity of an electric field applied thereto, an optical fiber for delivering a light wave from a light source to the sensor head to make the light wave be incident thereto, an optical fiber for delivering the transmitted light wave of the sensor head to a photoelectric transducer, and a measuring unit for measurement and display of an electric signal from the photoelectric transducer, an electromagnetic noise or an electromagnetic leaking wave is detected as variation of the light intensity by locating the sensor head in the vicinity of a source of the electromagnetic noise or the leaking wave without contacting the source.
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