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Bidirectional reflection distribution function measurement method for typical target in field environment

A bidirectional reflection distribution and typical target technology, applied in the field of bidirectional reflection distribution function measurement, can solve the problems of large measurement error and heavy measurement workload, and achieve the effect of improving measurement efficiency, measurement accuracy and operability

Active Publication Date: 2019-06-25
BEIJING INST OF ENVIRONMENTAL FEATURES
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a two-way reflection of a typical target in the field environment, aiming at the defects that the measurement workload of the typical target BRDF is large and the measurement error is relatively large under strong scattering weather conditions in the prior art. Distribution function measurement method

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  • Bidirectional reflection distribution function measurement method for typical target in field environment
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  • Bidirectional reflection distribution function measurement method for typical target in field environment

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specific Embodiment approach 1

[0032] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 1. The present invention provides a method for measuring the bidirectional reflectance distribution function of a typical target in a field environment. figure 1 shown, including:

[0033] Under different observation geometric conditions in the field environment, the imaging detection system is used to measure the reflected radiation intensity of the typical target to be tested under natural light irradiation and the reflected radiation intensity of the standard plate natural light irradiation;

[0034] At the same time, based on the atmospheric radiation transfer model, calculate the sky diffuse light reflection radiation intensity of the typical target to be measured and the standard plate sky diffuse light reflection radiation intensity in the field environment;

[0035] Calculate the reflected radiation intensity of the typical target to be measured by the natural light irradiation reflected radiation intensity of th...

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Abstract

The invention relates to a bidirectional reflection distribution function measurement method for typical target in a field environment. The method includes the following steps that: an imaging detection system is adopted to measure the natural light irradiation reflection radiation intensities of a typical target to be tested and a standard plate under different observational geometric conditionsin a field environment; the sky diffused light reflection radiation intensities of the typical target to be tested and the standard plate in the field environment are calculated on the basis of an atmospheric radiation transmission model; the sun direct light reflection radiation intensities of the typical target to be tested and the standard plate are correspondingly obtained according to the natural light irradiation reflection radiation intensities and the sky diffused light reflection radiation intensities; and the bidirectional reflectance ratio of the typical target to be tested is calculated according to a comparative measurement method, and the BRDF (bidirectional reflectance distribution function) value of the typical target to be tested is obtained according to a relationship between the bidirectional reflectance ratio and the bidirectional reflectance distribution function model. With the bidirectional reflection distribution function measurement method for the typical target in the field environment of the invention adopted, the influence of sky diffused light on the measurement of the BRDF value of the typical target can be effectively reduced, and therefore, the measurement accuracy of the BRDF of the typical target under different climatic conditions can be improved.

Description

technical field [0001] The invention relates to the technical field of bidirectional reflection distribution function measurement, in particular to a method for measuring a bidirectional reflection distribution function of a typical target in an outdoor environment. Background technique [0002] The phenomenon of reflected radiation produced during the interaction between light waves and matter reveals the inherent properties of matter itself. This property is usually characterized by the Bidirectional Reflectance Distribution Function (BidirectionalReflectance DistributionFunction, BRDF), which is defined as the ratio between the outgoing irradiance and the incident irradiance on the surface of the object, which represents the reflection of the surface of the object at any observation angle under different incident conditions. characteristic. The bidirectional reflectance distribution function is an important physical quantity describing the light spatial reflection charac...

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Application Information

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IPC IPC(8): G01N21/55G01N21/47
Inventor 杨敏徐文斌吴志宏黄来玉刘畅李军伟郑崇修鹏孙宪中刘菁
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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