复杂混合溶液成分高光谱分析的可行性

采用高光谱技术对复杂混合溶液进行检测分析,同时利用被测物质的吸光度和散射特性信息以提高光谱的信噪比。实验设计了高光谱采集装置,采集生物组织模拟液(Intralipid-10%)的漫反射高光谱图像,并用Monte Carlo方法和漫射近似理论对其进行了正向和反向推导,获得了632nm波长下,Intralipid-10%吸收系数为0.002 0cm-1,与标准参数相对误差为11.1%;约化散射系数为63.35cm-1,与标准参数相对误差为6.49%,基本符合标准参数的误差范围,验证了该高光谱检测系统的准确性。还利用该高光谱系统对不同厂家出品的牛奶、果汁等样本进行了高光谱采集,得到不同样本间差异较传统二维光谱更为明显的结果,充分证明了高光谱方法在复杂混合溶液成分分析中具有很强的可行性。

Feasibility of composition analysis of complex mixed solution by hyperspectral technique

The complex mixed solution is a common material form in all walks of life. It was difficult to achieve the desired results if the complex mixed solution was detected by the traditional spectral analysis method. The hyperspectral technology was taken to detect the complex mixed solution to improve the signal to noise ratio of the spectrum by utilizing the absorbing and scattering characteristics of the analytes at the same time. A hyperspectral acquisition device was designed to collect the diffuse reflectance hyperspectral images of the analytes (Intralipid-10%). The Monte Carlo simulation and the diffuse approximation were used to validate the experimental device. The authors found that the absorption coefficient of the Intralipid-10% at 632 nm was 0.002 0 cm(-1) and the reduced scattering coefficient was 63.35 cm(-1); the corresponding relative error of the standard reference was 11.1% and 6.49%. The inversion result of the diffuse approximation validated the exactness of the experimental device. Finally, the hyperspectral images of milk and fruit juice from different manufacturers were taken, the images show that the differences between different samples were more obvious than that of traditional 2-dimensional spectrum. This research reveals that the hyperspectral technology is feasible in the component analysis of complex mixed solution.