LED pulse light source type crop canopy vegetation index determining system

A measurement system, pulsed light source technology, applied in measurement devices, measurement of scattering properties, material analysis by optical means, etc., to achieve the effects of less optical channels, good stability, and strong practicability

CN107389613APending Publication Date: 2017-11-24GUANGXI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-11-24

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Abstract

The invention provides an LED (Light Emitting Diode) pulse light source type crop canopy vegetation index determining system. The system comprises three parts, namely, a sensor, a controller and a power circuit, wherein the sensor comprises an active light source module, an optical system module and a signal regulating and sampling module; the active light source module is controlled by a pulse signal outputted by the controller, is used for realizing the alternative illumination and pulse flickering of a red light LED set and a near-infrared LED set and is used as an active type LED pulse light source; the controller comprises an MCU module, a key module, a data storage module and a display module. The determining system provided by the invention is low in power consumption; the whole structure is high in practicability; the sensor adopts the pulse type light source design, the alternative type light source driving is adopted and a single detector is adopted, so that the light source stability is good and the optical channel is high in integrated degree and is simple; the determining system also is equipped with band-pass filter and software filter for reducing the data error; a friendly human-computer interface is adopted, so that the determining system is especially suitable for popularization and application in practical agricultural production.
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Description

technical field

[0001] The invention relates to a crop canopy vegetation index measurement system, in particular to an LED pulse light source type crop canopy vegetation index measurement system, which belongs to the technical field of agricultural information detection tools. Background technique

[0002] In recent years, scholars at home and abroad have studied the mechanism relationship between diffuse reflectance spectra and related crop growth information. It has been shown that the use of canopy spectral analysis technology can effectively realize the dynamic monitoring of crop growth characteristics and plant nutritional status. Among them, the difference vegetation index (DVI ), Normalized Difference Vegetation Index| (NDVI) and Ratio Vegetation Index (RVI) and other spectral indices are widely used to estimate the nutritional status of plants. The normalized difference vegetation index | (NDVI) is obtained by using the normalized ratio of the reflectance of the two ...

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings.

[0052] Such as figure 1 As shown, the LED pulse light source crop canopy vegetation index measurement system includes three parts: a sensor, a controller and a power circuit. The sensor includes an active light source module, an optical system module, a signal conditioning and sampling module.

[0053] The active light source module is equipped with a group of red LEDs, a group of near-infrared LEDs and a pulse drive circuit, and the pulse drive circuit is controlled by the controller to output pulse signals to alternately drive the red LED group and the near-infrared LED group, so that the red LED group and the near-infrared LED group The infrared LED group realizes alternate light emission and pulse flashing, as an active LED pulse light source. The circuit diagram of the active light source module is shown in figure 2 As shown, the pulse drive circuit uses two LE...