The Preliminary Research on Isolated Leaf Moisture Detection Using Terahertz Technology
LONG Yuan1, 2, 3, ZHAO Chun-jiang1, 2, 3, 4, 5, LI Bin1, 2, 3*
1. Beijing Research Center for Information Technology in Agriculture, Beijing 100097, China
2. National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China
3. Key Laboratory of Agri-informatics, Ministry of Agriculture, Beijing 100097, China
4. Beijing Engineering Research Center of Agricultural Internet of Things, Beijing 100097, China
5. Key Laboratory of Quantitative Remote Sensing in Agriculture of Ministry of Agriculture, Beijing 100097, China
Abstract：Leaf moisture is an important parameter of plant health, and Terahertz is sensitive to leaf moisture. When terahertz spectra penetrate the leaf, the leaf can be imaged according to different moisture contents at different positions. In this research, Terahertz technology was used to detect the isolated leaf moisture. The relationship between leaf moisture and terahertz spectroscopy data was studied. Terahertz data were obtained by scanning the leaf in vitro. Then the time domain amplitude was obtained and the frequency domain spectra were extracted to rebuild the leaf images. The distribution of the leaf moisture could be clearly observed. This study showed that the image quality with the minimum time domain performed the best. Also, the optimal model was established. The correlation coefficient and the root mean square error of the prediction model were 0.981 7 and 0.023 7 g, respectively. The result of the research provides a guidance to predict live leaf moisture using Terahertz technology in the future.
Key words：Terahertz imaging; Time domain spectra; Leaf moisture
龙 园，赵春江，李 斌. 基于太赫兹技术的植物叶片水分检测初步研究[J]. 光谱学与光谱分析, 2017, 37(10): 3027-3031.
LONG Yuan, ZHAO Chun-jiang, LI Bin. The Preliminary Research on Isolated Leaf Moisture Detection Using Terahertz Technology. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2017, 37(10): 3027-3031.
[1] John F Federici. Journal of Infrared, Millimeter, and Teraherz Waves, 2012, 33: 97.
[2] Qin Jianyuan, Ying Yibin, Xie Lijuan. Applied Spectroscopy Reviews, 2013, 48: 439.
[3] WANG Dong, PAN Li-gang, LIU Long-hai，et al(王 冬, 潘立刚, 刘龙海，等). Quality and Safety of Agro-Products(农产品质量与安全), 2015, 6: 57.
[4] ZHANG Zeng-yan, JI Te, XIAO Ti-qiao, et al(张增艳，吉 特，肖体乔，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2015, 35(12): 3315.
[5] DENG Hu, SHANG Li-ping, ZHANG Ze-lin, et al(邓 琥，尚丽平，张泽林，等). Infrared and Laser Engineering(红外与激光工程)，2015, 14(3): 979.
[6] LIU Huan, HAN Dong-hai(刘 欢，韩东海). Journal of Food Safety and Quality(食品安全质量检测学报)，2014，5(3)：725.
[7] YANG Hang, ZHAO Hong-wei, ZHANG Jian-bing, et al(杨 航，赵红卫，张建兵，等). Journal of Infrared Millimeter Waves(红外与毫米波学报), 2014, 33(3): 263.
[8] Castro-Camus E, Palomar M，Covarrubias A A. Scientific Report, 2013, 1: 5.
[9] Gente R，Born N，Vo N，et al. Journal of Infrared, Millimeter, and Terahertz Waves, 2013. 1.
[10] Christian Jansen, Steffen Wietzke, Ole Peters, et al. Applied Optics, 2010, 49(19): 49.
[11] Zuo Jian，Zhang Zhenwei，Zhang Liangliang，et al. Chinese Optics Letters, 2012, 10：S13001-1.
[12] GE Jin, WANG RENG, ZHANG Lei, et al(葛 进，王 仍，张 雷，等). Laser and Infrared(激光与红外)，2010，40(4)：383.
[13] YANG Zhen-gang, LIU Jin-song, WANG Ke-jia(杨振刚，刘劲松，王可嘉). Journal of Optoelectronics·Laser(光电子·激光)，2013，24(6)：1158.
[14] Bjrn Breitenstein，Maik Scheller, Mohammad Khaled Shakfa, et al. Journal of Applied Botany and Food Quality, 2011, 84：158.
