Browsing by Author "Liang, Wen-Lie"

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High-sensitivity optically modulated scatterer for electromagnetic-field measurement
(2007-04-01)
Lao, Ray-Rong
;
Liang, Wen-Lie
;
Shay, Wen-Tron
;
Thompson, Richard P.
;
Dudley, Richard A.
The optically modulated-scatterer (OMS) technique is developed for electromagnetic-field-distribution measurement with minimum disturbance to the field under test. In this paper, an OMS with newly designed photoconductive-switching structure is proposed. The performances of the new OMS are evaluated with a monostatic-field-measurement system. Measurement results show that an improvement of 6 to 8 dB in sensitivity is achieved compared to previous OMS devices. The developed OMS was used in an electromagnetic-field-distribution mapping system to measure the field distribution in a cubic phantom radiated by a mobile phone. The results show the suitability of this OMS for specific-absorption-rate measurement application.