基于图像技术的铁离子分析方法研究  

Study of Iron Ions' Analytical Method Based on Image Technology

作　　者：曹生现[1] 郑丽婷[1] 王延红[1] 李国英[1] 李思博[1] 

机构地区：[1]东北电力大学自动化工程学院,吉林吉林132012

出　　处：《化工自动化及仪表》2014年第5期557-562,共6页Control and Instruments in Chemical Industry

基　　金：国家自然科学基金资助项目(50806010);吉林省科技发展计划项目(20125050);吉林市科技发展计划项目(201262504)

摘　　要：为准确、快速分析水质铁离子浓度，在磺基水杨酸分光光度法的基础上，提出了图像特征颜色测量铁离子浓度的方法，推导建立了铁离子浓度与图像色度值、光程长的数学方程，开发了基于图像技术的铁离子分析方法和装置。该装置利用高精度彩色摄像头替代人类视觉或分光光度计，基于Lab-VIEW8．6开发了分析测试软件，采集有色溶液的图像，采用无影稳压光源为背景光源，并将采集的图像R、G、B的均值由RGB颜色空间转换到HSI颜色空间，以提高测量准确度。以该装置为研究平台，进行了水质铁离子检测的影响因素分析和实验条件优选，给出了铁离子测量的最优分析条件。在最优条件下，进行了标准曲线绘制、重复性检测和测量结果分析。结果表明：该方法相关系数达为0．9992，检出限为0．002mg／L，相对偏差范围是-0．0570％～0．0780％，与分光光度法比较，该方法准确度高、稳定性好。Based on sulfosalicylic acid spectrophotometry , and making use of color image characteristics to de-tect the iron ion concentration in water was proposed; and the mathematical equation concerning the iron ion concentration , the image chrominance values and the optical path length were deduced , including the develop-ment of image technology-based method and device for analyzing the iron ion concentration .The device devel-oped can replace the visual or spectrophotometer with high-precision color webcam; the LabVIEW8.6-based analyzing and measuring software helps the device collect the image of colored solution automatically ; taking shadowless stabilize light as the background light , and transforming RGB of image R, G, B’ s mean collected to HSI color space so as to improve the detection accuracy .Taking the device as a platform , analyzing the fac-tors which influencing the iron ion detection in water and optimizing experimental conditions were implemen -ted , including the presence of optimal analysis conditions for iron ion detection .Under the optimal conditions , analyzing the standard curve , repeatability and detection result shows that this method outperforms the spectro-photometry in accuracy and stability , its linear correlation coefficient can reach 0 .999 2 , and its detection lim-it stays at 0.002mg/L together with a-0.057%~0.078 0%relative deviation.

关 键 词：铁离子浓度 图像技术 优化 标准曲线 

分 类 号：TH83[机械工程—仪器科学与技术]