光谱学与光谱分析 |
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Study on Discrimination of Varieties of Fire Resistive Coating for Steel Structure Based on Near-Infrared Spectroscopy |
XUE Gang, SONG Wen-qi*, LI Shu-chao |
Tianjin Fire Research Institute of Ministry of Public Security, Tianjin 300381, China |
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Abstract In order to achieve the rapid identification of fire resistive coating for steel structure of different brands in circulating, a new method for the fast discrimination of varieties of fire resistive coating for steel structure by means of near infrared spectroscopy was proposed. The raster scanning near infrared spectroscopy instrument and near infrared diffuse reflectance spectroscopy were applied to collect the spectral curve of different brands of fire resistive coating for steel structure and the spectral data were preprocessed with standard normal variate transformation(standard normal variate transformation, SNV)and Norris second derivative. The principal component analysis(principal component analysis, PCA)was used to near infrared spectra for cluster analysis. The analysis results showed that the cumulate reliabilities of PC1 to PC5 were 99.791%. The 3-dimentional plot was drawn with the scores of PC1, PC2 and PC3×10, which appeared to provide the best clustering of the varieties of fire resistive coating for steel structure. A total of 150 fire resistive coating samples were divided into calibration set and validation set randomly, the calibration set had 125 samples with 25 samples of each variety, and the validation set had 25 samples with 5 samples of each variety. According to the principal component scores of unknown samples, Mahalanobis distance values between each variety and unknown samples were calculated to realize the discrimination of different varieties. The qualitative analysis model for external verification of unknown samples is a 100% recognition ration. The results demonstrated that this identification method can be used as a rapid, accurate method to identify the classification of fire resistive coating for steel structure and provide technical reference for market regulation.
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Received: 2014-02-27
Accepted: 2014-06-18
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Corresponding Authors:
SONG Wen-qi
E-mail: songwenqi@tfri.com.cn
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