Calibration and using an electro-optical E-field sensor to study tuner panel and raised floor effects in a reverberation chamber

The construction of a reverberation chamber determines the overall quality factor of the chamber and also the uncertainty of field strength. Details are given in [1]. Especially in chambers constructed for large and heavy test objects a raised floor is installed on top of the ground shield. For the reverberation of the field a tuner is installed which needs a significant size for low frequencies. The quality factor should not be lowered by these installations. A lithiumniobate-based electro-optical field sensor system [2] is used to measure the electrical field between the raised floor, the ground shield and within a tuner paddle. First the sensor system is calibrated in a micro TEM-Cell and its results are verified in a larger TEM cell, a semi-anechoic room and in the empty reverberation chamber. Finally the change of field strengths caused by better shielding of the raised floor and tuner is given.