光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
Spectroscopy and Spectral Analysis
2015年
10期
2691-2696
,共6页
Vo Quang Sang%冯鹏%米德伶%汤斌%魏彪
Vo Quang Sang%馮鵬%米德伶%湯斌%魏彪
Vo Quang Sang%풍붕%미덕령%탕빈%위표
非球形悬浮颗粒物%T矩阵模型%光散射强度%水质检测
非毬形懸浮顆粒物%T矩陣模型%光散射彊度%水質檢測
비구형현부과립물%T구진모형%광산사강도%수질검측
Non spherical suspended particles%T matrix model%Light scattering intensity%Water quality measurement
水体中悬浮颗粒物的光散射特性是影响基于直接光谱法水质检测结果准确性的一个重要参数。依据 T矩阵模型，研究了紫外‐可见光照射下水体中非球形悬浮颗粒物的光散射强度特性。以藻类和泥沙类颗粒物为例，构造了椭球、圆柱和广义Chebyshev三种非球形粒子光散射模型，分析了入射光波长、悬浮颗粒物形状、复折射率与相对散射光强之间的关系，计算了不同悬浮颗粒物相对散射光强随波长、颗粒物尺寸以及旋转角变化的情况。数值仿真结果表明，不同种类非球形悬浮颗粒物的散射光强度均呈现出显著的变化。在200～800 nm波长范围内，随入射波长的增大，粒子几何尺寸所带来影响逐渐减小，散射特性主要由复折射率决定。当粒子尺寸小于0.2μm或接近1μm时，在入射光波长位于紫外或红外的条件下，散射光强度较大且呈现强烈振荡；而当粒子尺寸 r＝0.3～0.9μm ，散射强度较稳定，接近于0且受到入射光波长的干扰较小。这可为提高紫外‐可见吸收光谱法的检测精度、抑制散射干扰提供一定依据。
水體中懸浮顆粒物的光散射特性是影響基于直接光譜法水質檢測結果準確性的一箇重要參數。依據 T矩陣模型，研究瞭紫外‐可見光照射下水體中非毬形懸浮顆粒物的光散射彊度特性。以藻類和泥沙類顆粒物為例，構造瞭橢毬、圓柱和廣義Chebyshev三種非毬形粒子光散射模型，分析瞭入射光波長、懸浮顆粒物形狀、複摺射率與相對散射光彊之間的關繫，計算瞭不同懸浮顆粒物相對散射光彊隨波長、顆粒物呎吋以及鏇轉角變化的情況。數值倣真結果錶明，不同種類非毬形懸浮顆粒物的散射光彊度均呈現齣顯著的變化。在200～800 nm波長範圍內，隨入射波長的增大，粒子幾何呎吋所帶來影響逐漸減小，散射特性主要由複摺射率決定。噹粒子呎吋小于0.2μm或接近1μm時，在入射光波長位于紫外或紅外的條件下，散射光彊度較大且呈現彊烈振盪；而噹粒子呎吋 r＝0.3～0.9μm ，散射彊度較穩定，接近于0且受到入射光波長的榦擾較小。這可為提高紫外‐可見吸收光譜法的檢測精度、抑製散射榦擾提供一定依據。
수체중현부과립물적광산사특성시영향기우직접광보법수질검측결과준학성적일개중요삼수。의거 T구진모형，연구료자외‐가견광조사하수체중비구형현부과립물적광산사강도특성。이조류화니사류과립물위례，구조료타구、원주화엄의Chebyshev삼충비구형입자광산사모형，분석료입사광파장、현부과립물형상、복절사솔여상대산사광강지간적관계，계산료불동현부과립물상대산사광강수파장、과립물척촌이급선전각변화적정황。수치방진결과표명，불동충류비구형현부과립물적산사광강도균정현출현저적변화。재200～800 nm파장범위내，수입사파장적증대，입자궤하척촌소대래영향축점감소，산사특성주요유복절사솔결정。당입자척촌소우0.2μm혹접근1μm시，재입사광파장위우자외혹홍외적조건하，산사광강도교대차정현강렬진탕；이당입자척촌 r＝0.3～0.9μm ，산사강도교은정，접근우0차수도입사광파장적간우교소。저가위제고자외‐가견흡수광보법적검측정도、억제산사간우제공일정의거。
Scattering light properties of suspended particles in water is an important parameter which influences the accuracy of water quality measurement .In this paper ,based on T matrix model ,the authors study the UV‐Visible light irradiation intensity of 3 kinds of non‐spherical suspended particles including ellipsoid ,cylinder and generalized Chebyshev in water .The relationship between light scattering intensity and incident light wavelength ,shape parameters of suspended particles ,complex refractive in‐dex and rotation angle has been presented in detail .Simulation results show that when changing the particle size ,adjusting the wavelength of incident light ,all light scattering intensity of 3 kinds of non‐spherical suspended particles show significant chan‐ges .In the wavelength range from 200~800 nm ,the impact of geometric on the particles size decreases with increasing wave‐length and the sattering properites mainly depends on complex refractive index .The scattering intensity becomes stronger and exhibits strong oscillations for ultraviolet and infrared light when the diameter of particles are less than 0.2μm or approaching 1μm .However ,the scattering intensity is relatively stable and close to zero ,shows small disturbances with the change of wave‐length of incident light when the particles sizes are within 0.3 to 0.9 μm.
