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Data collector of tree coronal layer analyzer

A technology of data acquisition and analyzer, applied in the direction of measuring devices, analyzing materials, and analyzing materials through optical means, can solve problems such as errors and differences, and achieve the effect of reducing errors and reducing optical imaging errors

Inactive Publication Date: 2009-04-22
SUN YAT SEN UNIV
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Problems solved by technology

[0009] Moreover, the hemispherical sensor measures the information within the field of view of the lens at the installation point of the instrument, but the openness of this field of view varies with the lens. In addition, the non-linear geometric distortion of the camera lens, the image plane and the CCD plane are caused by misalignment. Factors such as linear geometric distortion also bring errors

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  • Data collector of tree coronal layer analyzer
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Embodiment Construction

[0023] The working principle of the present invention is as follows: (1) replace the problem that the TRAC instrument measures along a straight line on the ground with long-time measurement. Because the sun goes from rising to setting, the light passes through the canopy on a strip in the direction of the sun's movement and projects the light spots onto the measuring plate, that is, the movement of the instrument is replaced by the movement of the sun. During the entire measurement process, the light spots detected on the flat plate represent the projection of the leaf gaps at different positions on the strip, so that the spatial distribution of the leaves can be deduced. (2) Taking a typical spherical tree crown as an example, the sun irradiates from different angles and passes through the tree crown to reach the flat-panel instrument, which is equivalent to recording the solar radiation under different zenith angles. The current commonly used instrument is to obtain the sola...

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Abstract

A data acquisition device of a tree canopy analyzer comprises an optical filter, a sensing device which is connected with the optical filter in a sealing way; the sensing device is connected with an acquisition control unit and a memory device; the sensing device is an array which comprises a plurality of opto-electrical sensing units arranged in the same plane. The device measures characteristic parameterS of the tree canopy structure on the plane; when in working, the device is arranged under the canopy of trees or forest; the intensity of the sun illumination permeating the canopy and the change process of the facula structure in a period of time are measured so as to calculate leaf area indexes, extent of porosity, extinction coefficient of the canopy and anisotropic characters of the structure parameters; as the leaf space distribution, the zenith angle of the sensor and the solar altitude can be considered at the same time, the error can be reduced; in addition, as a photoelectric sensor is adopted, the optical imaging error is reduced; and the sensing unit is connected with a memory device, thus realizing data measurement in long period.

Description

technical field [0001] The invention relates to the field of tree canopy measurement, in particular to a data acquisition device of a tree canopy analyzer. technical background [0002] Tree canopy parameters are the main parameters to evaluate the characteristics of plant photosynthesis in the fields of forestry and agronomy, and are of great significance in scientific research and production practice. Sensors that measure these parameters fall into two categories: linear sensors and hemispherical sensors. [0003] Linear sensors such as Sunfleck Ceptometer, AccuPAR PAR-80, AccuPAR LP-80 and other types of plant canopy analyzers from Decagon Corporation of the United States measure the photosynthetically active radiation intensity in the 400-700nm band of the plant canopy through 80 sensors on the probe rod, and Calculate the leaf area index. The SunScan canopy analyzer of Delta Company in the United Kingdom uses 64 sensors on a 1-meter-long probe rod to measure the ellip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/00G01N33/00
Inventor 林广发夏北成
Owner SUN YAT SEN UNIV
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