Abstract
In Hei Longjiang Province of China, ten million tons of soybean straws are produced every year, most of which are burned or discarded. The comprehensive utilization rate is less than 5 %. However, as a kind of high-quality raw material resources, the soybean straw is the main material when producing fuel ethanol and biodiesel. The traditional chemical detection technology was always applied to test the quality of straws’ internal components, which needs long time and high cost. Therefore, this research adopted near-infrared spectroscopy technology to establish models to achieve rapid detection of straw’s internal components. One hundred and fifty-two samples of straw were collected within Heilongjiang Province, and the main ingredients, lignin and hemicellulose, were chosen as the research objects. K-stone method is used to divide into calibration and validation sets. The correlation coefficient is adopted to select and validate characteristic bands. After removal of the abnormal sample by concentration of residual method, the emphasis is put on the effect of removal of spectrum noise by applying the wavelet transform. The experimental results are that the model has good stability under the full spectrum band 4000–12,000 cm−1. After the removal of 3 lignin and 3 hemicellulose samples, respectively, the R 2 of calibration set of lignin and hemicellulose models increased significantly, from 0.5836436 and 0.4994598 to 0.6994097 and 0.6943559, respectively. However, after the 5-layer decomposition of DB2 wavelet, the R 2 increased to 0.8075574 and 0.8214309 separately. The validation set’s root mean square error prediction (RMSEP) fell from 0.7738772 and 0.3069899 to 0.5979685 and 0.2761462. After the conversion, the relative standard deviations (RSD) are 1.92 and 1.86 %, respectively. Unknown samples can be real-time predicted in short times after building the model, and the prediction process needs only 1960s. The experiments show that it is feasible to employ near-infrared spectroscopy method for rapid detection of straw components, which provides a new method to detect the straw ingredients rapidly in the future.
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Acknowledgments
We would like to acknowledge the editors and reviewers, whose valuable comments greatly improved the manuscript. This work was supported in part by the National High Technology Research and Development Program of China (863 Program) (2013AA102303), the Natural Science Foundation of Heilongjiang Province of China (F201402) and Key Technologies R&D Program of Heilongjiang Province of China (GA15B107).
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Kong, Q., Cui, G., Yeo, SS. et al. DBN wavelet transform denoising method in soybean straw composition based on near-infrared rapid detection. J Real-Time Image Proc 13, 613–626 (2017). https://doi.org/10.1007/s11554-016-0642-7
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DOI: https://doi.org/10.1007/s11554-016-0642-7