基于主動(dòng)光源的作物生長信息監(jiān)測儀的設(shè)計(jì)與實(shí)現(xiàn)
[Abstract]:Precise management of crop production is a kind of modern agricultural cultivation technology based on information technology and data knowledge. It combines the technical measures of crop information collection, data processing and management control. It can maximize the use of production resources and achieve high efficiency, high yield and low pollution of agricultural production. It is of great significance to the development of modern agriculture. Acquisition of crop information is the basis of accurate management of crop production. How to obtain crop information quickly and accurately is the key problem to be solved urgently in precision agriculture nowadays. Firstly, the paper clarifies the problems faced by traditional agriculture and the importance of precision agriculture development in China, and analyzes the important role of crop growth information acquisition in the realization of accurate management of crop production. The development and existence of spectral monitoring equipment for crop growth information at home and abroad in recent years are summarized. According to the contents of this study, the characteristics and advantages of non-destructive monitoring based on spectroscopy are analyzed, and the response mechanism of near-infrared spectroscopy for non-destructive monitoring of crops, the description method of reflectance spectroscopy characteristics of crop canopy and the monitored light are briefly described. Secondly, according to the characteristics of crop canopy row-seeding distribution and the needs of acquiring sensitive bands 730 nm and 810 nm of rice and wheat, a crop canopy reflectance spectrum sensor was designed to obtain the reflectance spectrum of 730 nm and 810 nm of crop canopy. The sensor mainly consists of a light source system consisting of a light source driving circuit and a light source light path unit, a spectrum signal acquisition system consisting of a spectrum signal acquisition light path unit and a weak signal conditioning circuit, and a double laser precise ranging system. The modulation frequency of the light source is 1 KHz, the central wavelength of the filter is 730 nm and 810 nm, and the bandwidth is 10 nm. The light source system of the crop canopy reflectance spectrum sensor emits 730 nm of constant light intensity, 810 nm modulated spectral signal to irradiate the crop canopy, and the spectral signal acquisition system receives the modulated spectral signal reflected by the crop canopy to obtain the intensity of the crop canopy reflectance spectrum. Thirdly, according to the output signal of crop canopy reflectance spectrum sensor and the need of field test, this paper uses ATmega32 integrated with ADC module as the core control chip, with temperature and humidity sensor, keyboard. Input, LCD display, acoustooptic reminder, SD card storage and power management and other components of the control part of the hardware circuit; C language design embedded control software to achieve crop growth information collection, display and storage, using SolidWorks designed the monitor structure diagram, and according to the structure diagram of the monitor for mechanical processing. The function test includes stability test, anti-light interference test, return error test, calibration test and temperature performance test, and field test includes reflectance test, crop growth information test and leaf area index test. The results of functional test and field test show that the designed crop growth information monitor has good performance and can meet the needs of fast and accurate acquisition of crop growth information.
【學(xué)位授予單位】:南京農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:S126
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