摘要
偏振光遥感是近来备受关注的一种新兴对地观测方法。在早期的传感器多以目标的反射辐射或自身的辐射强度来推断目标的状态和性质,而把传感器接收信号中的偏振作为一种“噪音”来处理,随着空间遥感科学的发展,科学家们发现偏振特性是一种良好的地表监测手段。
液体的折射率与液体的密度之间存在着一定的关系,通过折射率的测量可以反演出液体的密度。目前液体密度测量折射率的方法有多种,如折射法、布儒斯特角法等。布儒斯特角法即偏振测量,通过偏振度、探测角计算出折射率,从而反演液体的密度。
偏振遥感测量对于地物的光滑程度和折射率特别敏感,因而利用偏振遥感来测量液体密度相对于其他遥感手段具有一定的理论优势。本文以盐水为例(NaCl溶液),在固定的入射角和探测角下,测量偏振度在盐水浓度改变情况下的变化规律。利用物理公式以探测角和偏振度为输入量计算出盐水的折射率及其变化规律。利用最小二乘法拟合出液体浓度于其折射率之间的关系,并建立回归公式。
偏振遥感测量液体密度具有很大的实践意义,在海洋遥感、水质监测、环境评估等领域都有广泛的应用前景。
Polarization is an abserved method emerging to the place. the early sensors conclude the condition and the nature by the goal reflected radiation or own radiation intensity , and takes the sensor received signals in polarization as“the noise”to process. Along with spatial remote sensing science development, The scientists discovered that the polarization characteristic is one good surface monitor method.
Between the liquid refractive index and liquid density has certain relations.we can invers the liquid density through the measurement of the refractive index,at present,the measurement of refractive index has many methods,such as refraction method、Brewster method. Brewster method is polarization measurement,witch can figure out the refractive index through the degree of polarization and zenith angle.
Polarization measurement is specially sensitive regarding smooth degree of ground objects and the refractive index.Therefore using the polazation that measure the liquid density has more theory superiority than other remote sensing method. This article take the salt water as an example(NaCl solution),under the fixed azimuth angle and detection angle,we can measure the rule of polarization degree when the liquid density change.When we take the detection angle and polarition degree as the input ,we can figure out the refractive index and the rules of the salt water using the physical equation .using least square method,we can find the relation between liquid density and refractive index,and establish the regression formula.
using the polarization that measure the liquid density has the great practice significance. Polarization has the widespread application prospect in marine remote sensing,water quality monitoring,environmental assessment and so on.
引文
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