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近年来,微波遥感愈来愈受到各国的重视。特别是在海洋探测中,微波更是必不可少的手段。用微波辐射计测量了目标的亮温,要根据物质的比辐射率进行判读,这就必须知道目标物的介电特性。我们用空腔微扰法在1.43GHz测量了不同浓度的NaCl溶液及海水的相对复介电常数,得到了与文献所载相近的结果。本文对测量方法、实验设备作了简单介绍,对结果进行了分析。
In recent years, microwave remote sensing has gained more and more attention from all the countries. Especially in the ocean exploration, the microwave is an indispensable means. Using a microwave radiometer to measure the target’s bright temperature, according to the material’s emissivity for interpretation, which must know the dielectric properties of the target. We used the cavity perturbation method to measure the relative complex permittivity of different concentrations of NaCl solution and seawater at 1.43GHz, and got the similar result as the literature. This article gives a brief introduction of measurement methods and experimental equipment, and analyzes the results.