The Effects of Signal to Noise Ratio of Instrument and Number of Wavelengths on the Accuracy of Spectral Analysis
LI Gang1, ZHAO Zhe1, WANG Hui-quan1, LIN Ling1, WU Xiao-rong2, ZHANG Bao-ju2*
1. State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China 2. College of Physics & Electronic Information, Tianjin Normal University, Tianjin 300387, China
Abstract：In order to study the influence of the two factors, the signal to noise ratio (SNR) of instrument and number of wavelengths, on the accuracy of quantitative analysis in spectral modeling analysis, the influences of different SNRs, the number of wavelengths participating in partial least square regression, and multi-wavelength modeling in different SNR bands were taken into account. The relationships between these factors and quantitative analysis accuracy were explored by modeling analysis experiments. The results show that the analysis accuracy is directly related to the SNR of instrument. And increasing wavelengths, especial the ones with high SNR, reflects a phenomenon that four times of wavelength number will bring 2 times accuracy increasing, which can compensate for the lack of SNR. The research provides the experimental basis and theoretical guidance to improve the model’s quality and reduce the prediction error by the utilization and improvement of the instrument’s SNR and the reasonable choice of wavelengths and bands of modeling.
Key words：Signal to noise ratio;Number of wavelengths;Spectral analysis accuracy;Pure absorption;Partial least square
李 刚1，赵 喆1，王慧泉1，林 凌1，吴晓荣2，张宝菊2* . 光谱仪器信噪比与建模波长数对光谱分析精度的影响[J]. 光谱学与光谱分析, 2012, 32(08): 2286-2289.
LI Gang1, ZHAO Zhe1, WANG Hui-quan1, LIN Ling1, WU Xiao-rong2, ZHANG Bao-ju2* . The Effects of Signal to Noise Ratio of Instrument and Number of Wavelengths on the Accuracy of Spectral Analysis. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(08): 2286-2289.
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