Emissivity measurement study on wide aperture microwave radiator

The comparison research of emissivity measurement methods is presented in this paper. Different from the computation and measurement of general plane absorbing material, the emissivity measurement of pyramid microwave blackbody need consider near field effect, scattering effect and influence coming from measurement system reflection. Hence the measurement modeling of the former can not work well at measuring the emissivity of the latter. To improve emissivity measurement methods, the BIRMM (namely author's address) and the VNIIFTRI (All Russia scientific research institute for physical technical and radio technical measurement) finished together an international comparison measurement on same sample. The measurement methods used by BIRMM and VNIIFTRI and data are presented in following sections.

I. INTRODUCTION

The absolute accuracy of microwave remote sensing radiometers is an important consideration for many applications. One method of achieving absolute radiometer calibration is through the use of blackbody calibration targets to provide reference brightness temperature.