Affiliation:
1. Henan Provincial Key Laboratory of Grain Photoelectric Detection and Control
2. Henan University of Technology
Abstract
Terahertz spectrum is easily interfered by system noise and water-vapor absorption. In order to obtain high quality spectrum and better prediction accuracy in qualitative and quantitative analysis model, different wavelet basis functions and levels of decompositions are employed to perform denoising processing. In this study, the terahertz spectra of wheat samples are denoised using wavelet transform. The compound evaluation indicators (T) are used for systematically analyzing the quality effect of wavelet transform in terahertz spectrum preprocessing. By comparing the optimal denoising effects of different wavelet families, the wavelets of coiflets and symlets are more suitable for terahertz spectrum denoising processing than the wavelets of fejer-korovkin and daubechies, and the performance of symlets 8 wavelet basis function with 4-level decomposition is the optimum. The results show that the proposed method can select the optimal wavelet basis function and decomposition level of wavelet denoising processing in the field of terahertz spectrum analysis.
Funder
the Cultivation Programme for Young Backbone Teachers in Henan University of Technology
the Open Fund Project of Key Laboratory of Grain Information Processing & Control, Ministry of Education, Henan University of Technology
the Program for Science & Technology Innovation Talents in Universities of Henan Province
Key Science and Technology Program of Henan Province
The Innovative Funds Plan of Henan University of Technology
Natural Science Foundation of Henan
National Natural Science Foundation of China
Subject
Atomic and Molecular Physics, and Optics