A device and method for determining the effective irradiation area of ​​an active light source in the measurement of crop canopy reflection spectrum

Abstract

The invention discloses a device for measuring effective irradiation area of active light source in a crop canopy reflection spectrum measurement. The device comprises a measuring support, sliding tracks, two grayscale plates, and an installation box, the support is divided into two layers, the sliding tracks are arranged in the lower layer of the support, two grayscale plates are arranged on the left side and the right side of the sliding tracks and are capable of freely sliding in the horizontal direction, the installation box is arranged in the upper layer of the support and is used for installing a device for measuring canopy refection spectrum, and the installation position of the installation box is in the center of the planar projection of the measuring support. The invention aims to establish a method of determining the effective irradiation area of active light source in an active light source canopy reflection spectrum measuring device, through establishing a quantitatively mathematical relationship between the effective irradiation area and the canopy reflection spectrum response, provides an experiment measuring device and an experiment measuring method, and provides an evaluation basis for effectiveness of measuring data provided by an active light source type canopy reflection spectrum measuring device.

Description

technical field [0001] The present invention relates to technical fields such as geometric optics, non-destructive testing and spectral measurement, and especially establishes the relationship between the effective irradiation area of ​​an active light source and the spectral response characteristics through the study of the distribution characteristics of the diffuse reflection spectrum of the canopy. A method for quantifying the mathematical relationship between the effective irradiation area of ​​an active light source and spectral response characteristics, that is, a device and method for determining the effective irradiation area of ​​an active light source in the reflection spectrum measurement of a crop canopy. Background technique [0002] At present, using crop canopy diffuse reflectance spectra to obtain crop growth information is an important research direction in the field of agricultural information. Scholars at home and abroad have done in-depth and extensive re...

AI Technical Summary

Problems solved by technology

However, the larger the irradiation area, it is necessary to increase the radiation angle or increase the irradiation intensity. The former reduces the reflection intensity and makes detection difficult; the latter increases energy consumption, making it difficult for measuring instruments to achieve portable measurement

Therefore, the larger the irradiation area, the more difficult it is to realize the engineering; at the same time, it is difficult to achieve a uniform distribution of irradiation intensity in the irradiation area in theory, and it is difficult to obtain the contribution of each sub-area in the irradiation area to the measurement results through theoretical calculations Therefore, it is difficult to determine whether the theoretically designed maximum irradiation area is all effective

At present, judging from the literature at home and abroad, there is no relevant literature dedicated to the issue of the effective irradiation area

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