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Initiative light source type crop canopy reflection spectral measurement device and method

A technology of crop canopy and reflection spectrum, which is applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of unusability, achieve the effect of enhancing operability and improving signal-to-noise ratio

Inactive Publication Date: 2013-09-11
NANJING AGRICULTURAL UNIVERSITY
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Problems solved by technology

The passive light source measuring instrument uses sunlight as the detection light source. Its biggest limitation is that its use is affected by factors such as the intensity of sunlight and the angle of incidence of the sun, and its measured value will also change due to changes in the natural light environment. It is used when the weather has a large sun angle, and it cannot be used on rainy days

Method used

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  • Initiative light source type crop canopy reflection spectral measurement device and method
  • Initiative light source type crop canopy reflection spectral measurement device and method
  • Initiative light source type crop canopy reflection spectral measurement device and method

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with accompanying drawings and implementation.

[0031] (1) Specific implementation plan of the optical path system

[0032] The optical path system as a whole consists of a mounting base (such as figure 2 , 3), adjusting gasket (such as Figure 5 ), Cylindrical mirror mounting bracket (such as Figure 5 ), LED mounting locators (such as Figure 4 ) and optical components (the optical components include LED light-emitting array 12, cylindrical mirror, plano-convex lens, optical filter 10 and optical sensitive components), after the combination of the adjusting gasket and the cylindrical mirror mounting frame, it can be embedded in the mounting base from below , and assembled together by bolts. The LED installation locator can install the LED array on the installation base. After installation, the LED array is aligned with the light belt shaping groove. The overall appearance after installation is a...

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Abstract

The invention provides an initiative light source type crop canopy reflection spectral measurement device and method and belongs to the field of geometrical optics and agricultural information nondestructive testing. A driving light source is a double-channel narrow-band LED (Light Emitting Diode) light source and adopts a special structure with adjustable light path parameters; the change of initiative light source irradiation characteristic parameters is realized according to measurement requirements so that spectral reflectance measurement of canopies with different scales can be met; a light path structure of a measurement system can guarantee that a constant value proportion relation can be kept when the height change is measured by a double-channel reflection spectral response value, so that measurement values of specific value type spectral indexes including NDVI (Normalized Difference Vegetation Index), RVI (Ratio Vegetation Index) and the like are theoretically not changed along with the measurement height.

Description

technical field [0001] The invention relates to the structural design of the optical path system of a crop canopy reflection spectrum non-destructive detection device based on an active light source, which belongs to the field of geometric optical technology design, but it has special features in special application fields, especially its light-gathering form and detection unit The combined form and structural form reflect the special certificate in the field of non-destructive testing of agricultural information, specifically a kind of narrow-band LED active light that can be integrated into a strip light with special geometric characteristics that is suitable for crop canopy detection, and canopy The optical detection mechanism that converts the reflected light of the layer into a photoelectric signal for easy detection. Combined with the crop growth information model, the measured values ​​can be transformed into various crop growth indicators to realize the diagnosis of cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/27
Inventor 丁永前朱艳曹卫星李杨王致情谭星祥徐志刚
Owner NANJING AGRICULTURAL UNIVERSITY
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