中波红外土壤含水量的光谱偏振特性

Polarization spectral characteristics of soil surface moisture in the mid-wave infrared range

采用中波红外光谱偏振探测手段,对不同含水量的土壤表面进行了观测,结果表明,含水土壤表面自身热辐射的偏振特性很弱,其偏振特性主要是由太阳光反射所引起,并在太阳光较强的波段上,土壤表面的偏振度与土壤含水量存在单调递增关系,为土壤含水量的中波红外偏振遥感技术发展提供了科学依据.

The surfaces of soil with different moisture contents had been surveyed by the spectral polarimetry in the mid- wave infrared range. The results indicate that the thermal radiation from the water-beating soil surface is almost unpolarized, and the polarization characteristic of the soil surface is mainly caused by the reflection of solar light. Especially in the strong sunshine spectral range, the degree of polarization increases monotonically with the increase of soil moisture. This quantitative relationship provides basis for soil moisture monitoring by the remote sensing of the polarization of light in the mid-wave infrared range.