12 December 2018 Research of nitrate concentration prediction based on GA
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Proceedings Volume 10850, Ocean Optics and Information Technology; 1085008 (2018) https://doi.org/10.1117/12.2504459
Event: International Symposium on Optoelectronic Technology and Application 2018, 2018, Beijing, China
Abstract
High concentration of nitrate will cause many problems, such as water eutrophication and compromise of human beings’ health. A fast and stable approach was applied to predict nitrate concentration in solutions using the dual optical active correction continuous spectrum analyzer designed by our research group. Firstly, standard normal variate (SNV) was used to pretreat the spectral data. Then characteristic wavelengths of spectral curve were selected by using successive projections algorithm (SPA) and genetic algorithm (GA) respectively. Finally, partial least-squares regression (PLSR) was applied to build the spectral prediction model to predict nitrate concentration, and coefficient of determination (R2) and root mean square error of prediction (RMSEP) were introduced as the evaluation indicators of prediction models. For SNV-GA-PLS model, R2=0.9966 and RMSEP=0.1712, which outperformed than SNV-UVE-SPA-PLS model (R2=0.9896, RMSEP=0.3952). It demonstrated that he model which selects spectral characteristic wavelengths by GA can decrease the complexity of prediction model building and ensure the accuracy as well. Hence, SNV-GA-PLS model can be used to predict nitrate concentration in water with quick and steady performance.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Xueji Wang, Bingliang Hu, Tao Yu, Qingsong Liu, Hongbo Li, and Yao Fan "Research of nitrate concentration prediction based on GA", Proc. SPIE 10850, Ocean Optics and Information Technology, 1085008 (12 December 2018); doi: 10.1117/12.2504459; https://doi.org/10.1117/12.2504459
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