Abstract

A new light modulated array technique for measuring electromagnetic fields is described. The array element used is a dipole made using a photodiode. A modulated laser scanning system is used to scan the array. When the photodiode element is illuminated by the modulated laser beam, the selfimpedance of the dipole is itself modulated, and the secondary wave is detected by a remote receiver. Because the array is isolated and of small scatter cross-section, the disturbance to the measured field is minimised. An example measurement at 8.5 GHz is described. The results indicate that the technique provides a rapid method of imaging electromagnetic fields. The limitations of this approach are also discussed.

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