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Abstract
Due to the sensitivity of the fleld distribution within a resonant cavity to the presence of an object, conventional measurement techniques employing a probe sufier from a limited accuracy. Therefore we propose a new measurement technique of the electric fleld distribution that avoids the use of a probe. Based on the perturbation theory, it consists of a measure of the cavity resonant frequency variation while displacing a small perturbing object within the cavity. The choice of the perturbing object shape, dimension and material is discussed with the help of simulation and measurement results in a canonical case. The case of reverberation chamber equipped with a mode stirrer is also considered, as well as the insertion of a metallic box within the cavity. Our measurement setup is very low-cost, simple to set up and to use, and adapted to any cavity geometry.
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