Title :
An optically modulated field sensor to make TEM cells traceable to the NPL calculable standard dipole antenna
Author :
Loader, B. ; Liang, W. ; Alexander, M. ; Gregory, A.
Author_Institution :
Nat. Phys. Lab., Teddington, UK
Abstract :
This paper describes the evaluation of an electric field sensor based on a lithium niobate optical modulator, and also the modifications made to the field sensor system to improve its performance. The results of the calibration of the sensor against the NPL calculable standard dipole antenna, and also in three transverse electromagnetic (TEM) cells are presented. These indicate that the antenna factor of the modified field sensor system is stable to within /spl plusmn/0.3 dB. Further development of the system is outlined.
Keywords :
calibration; dipole antennas; electric field measurement; electric sensing devices; electro-optical modulation; lithium compounds; LiNbO/sub 3/; LiNbO/sub 3/ optical modulator; NPL; TEM cells; antenna factor; calibration; electric field sensor; optically modulated field sensor; standard dipole antenna; transverse electromagnetic cells; Dipole antennas; Optical attenuators; Optical fiber polarization; Optical filters; Optical interferometry; Optical modulation; Optical receivers; Optical sensors; Sensor systems; TEM cells;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2000 Conference on
Conference_Location :
Sydney, NSW, Australia
Print_ISBN :
0-7803-5744-2
DOI :
10.1109/CPEM.2000.850987
