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《Transactions of the Chinese Society of Agricultural Engineering》 2009-S2
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Water detection instrument design for living leaves based on near infrared spectroscopy

Hou Rui 1,2,Ji Haiyan 1,Rao Zhenhong 3,Shen Binghui 3(1.College of Information and Electrical Engineering,China Agricultural University,Beijing 100083,China;2.JinCheng Institute,Nanjing University of Aeronautics and Astronautics,Nanjing 211156,China;3.College of Science,China Agricultural University,Beijing 100083,China)  
In near infrared range,using low power consumption MCU MSP430 and light-to-frequency chip TSL230,a transmission water-measuring instrument was designed,which can realize non-destructive and in situ measurement of leaves.The instrument consisted of signal acquisition module,microprocessor system,software and calibration model.The signal acquisition module was made up of NIR LED,890 nm and 980 nm interference filter,light-to-frequency chip.The light-to-frequency chip simplified the signal acquiring circuit and decreased noise disturbance.The design of hardware and software,modeling and prediction of Chinese redbud leaves water were introduced.The predicted results were identical with the real values of leaf water,and the correlation coefficient was 0.900.The main features of the instrument were higher repetitiveness,stability and reliability.Compared with other apparatus,the instrument had advantages such as small volume,simple structure,lightweight,low power consumption and anti-interference.The experiment results indicated that this system was feasible to detect leaf water non—destructively and fast on fieldwork.
【Fund】: 国家高技术研究发展计划(“863计划”)(2007AA10Z211);; 国家科技支撑项目(2006BAD10A01)
【CateGory Index】: S237
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