High-Sensitivity Optically Modulated Scatterer for Electromagnetic-Field Measurement

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...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2007-04, Vol.56 (2), p.486-490
Main Authors: Ray-Rong Lao, Wen-Lie Liang, Wen-Tron Shay, Thompson, R.P., Dudley, R.A., Merckel, O., Ribiere-Tharaud, N., Bolomey, J.-C., Jenn-Hwan Tarng
Format: Article
Language:English
Subjects:
Cell phones
Devices
Disturbances
Electromagnetic measurements
Electromagnetic scattering
Imaging phantoms
Instrumentation
Mapping
Mobile handsets
Noise levels
Optical modulation
Optical scattering
Optical sensors
Optically modulated scatterer (OMS)
Performance evaluation
Photoconductivity
radiated field
specific absorption rate (SAR)
Testing
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2007.890627