Study of Plant Growth Regulators Detection Technology Based on Terahertz Spectroscopy
CHEN Xi-ai1,2,3, WU Xue1, ZHANG Song1, WANG Ling1
1. School of Mechanical and Electrical Engineering, China Jiliang University, Hangzhou 310018, China
2. State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
3. Zhejiang Yalong Educational Equipment Joint-Stock Co., Ltd., Wenzhou 325105, China
Abstract：The terahertz spectra of gibberellin, forchlorfenuron and thidiazuron in the range of 0.2 to 2.0 THz were obtained by THz time-domain spectroscopy, based on which their absorption and refraction spectra were calculated. The results showed that all of them had obvious characteristic absorption peaks in the terahertz band. The terahertz absorption spectra of nineteen different substances were classified and tested by least squares support vector machine. Particle swarm optimization and genetic algorithm were applied for the parameter optimization of the least squares support vector machine, and the stability of the model was tested with noise addition. This study demonstrates the feasibility of terahertz spectroscopy for identification of plant growth regulators and will provide a new approach for the detection of plant growth regulators.
Key words：Terahertz spectroscopy; Plant growth regulators; Absorption coefficient; Least squares support vector machines; Multi-class classification
