Water turbidity estimation using a hand‐held spectropolarimeter to determine surface reflection polarization in visible, near and short‐wave infrared bands
Water turbidity estimation using a hand‐held spectropolarimeter to determine surface reflection polarization in visible, near and short‐wave infrared bands
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使用手持式分光旋光计测定可见光、近波和短波红外波段的表面反射偏振来估计水浊度
DOI：
10.1080/01431160701395153
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发表时间：
2007
影响因子：
3.4
通讯作者：
K. Sugahara
中科院分区：
文献类型：
--
作者：
M. Shibayama;K. Kanda;K. Sugahara
这封信描述了一种使用手持式分光偏振仪评估陆地沃茨（例如灌溉渠、小溪、池塘、溪流和小河）浊度（悬浮固体浓度，SSC）的辐射测量技术。使用具有不同浊度水平的水的容器进行现场实验。在可见光、近红外和短波红外波段测量了从水中反射的太阳光的强度和偏振度。将反射光及其非偏振分量的强度除以入射太阳光强度，以分别得出辐射系数（Q，%）和非偏振辐射系数（Qnp，%）。用SSC的测量值对几个波段的Q和Qnp进行了回归。使用多波段Qnp的多元回归模型上级优于使用多波段Q的类似模型，因为Qnp模型不需要视角作为解释变量，而使用Q的模型需要这些角度。文中还介绍了在真实的水流中的初步试验结果。
This letter describes a radiometric technique to evaluate the turbidity (suspended solids concentration, SSC) of terrestrial waters (e.g. irrigation canals, creeks, ponds, streams and small rivers) using a hand‐held spectropolarimeter. A field experiment was conducted using a container of water with different turbidity levels. The intensity and degree of polarization of sunlight reflected from the water were measured in visible, near and short‐wave infrared bands. The intensity of the reflected light and its non‐polarized component were divided by the incident sunlight intensity to derive the radiant coefficient (Q, %), and the non‐polarized radiant coefficient (Qnp, %), respectively. The Q and Qnp in several wavelength bands were regressed against measured values of SSC. The multiple regression model using multi‐band Qnp is superior to a similar model using multi‐band Q because the Qnp model does not need viewing angles as explanatory variables, whereas the model using Q requires these angles. A result from preliminary testing in real streams is also presented.