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Outdoor high optical spectrum BRDF automatic detection method

An automatic measurement and hyperspectral technology, which is applied in the fields of remote sensing science and spectroscopy, can solve the problems of low spectral resolution of the detector, many influencing factors, and long measurement cycle, so as to achieve high spectral resolution, improve measurement accuracy and measurement speed fast effect

Inactive Publication Date: 2010-05-12
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] Due to the simple operating mechanism, the traditional measurement method mainly manually positions the detector to measure the reflection brightness of the target, and measures the reflection brightness of the reference plate during the measurement process to measure the BRDF characteristics of the relative measurement target. Shortcomings of long length and many influencing factors, and the spectral resolution of the detector is low

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  • Outdoor high optical spectrum BRDF automatic detection method
  • Outdoor high optical spectrum BRDF automatic detection method
  • Outdoor high optical spectrum BRDF automatic detection method

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Embodiment Construction

[0016] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method and device for outdoor hyperspectral BRDF automatic measurement with a high degree of automation.

[0017] The technical scheme of the present invention is as follows:

[0018] The outdoor hyperspectral BRDF automatic measurement method is characterized by setting an azimuth circular orbit and a zenith arc orbit. Support feet are installed under the azimuth circular orbit. The lower end of the zenith arc orbit can roll on the azimuth circular orbit. The arc orbit and the azimuth circular orbit have the same radius R, and the rolling trajectories of the azimuth circular orbit and the zenith arc orbit conform to a spherical surface with a radius of R; a mobile spectral radiance meter is installed on the zenith arc orbit, in the azimuth circular orbit A spectral irradiance meter is installed next to it. The spectral irradiance meter is used to measure the incident illumina...

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Abstract

The disclosed BRDF measurement method comprises: setting an azimuth circle orbit with support feet and a zenith arc orbit with a movable spectrum amplitude luminance meter, arranging a spectrum irradiation meter. Wherein, when keeping the luminance meter on set position, it measures data to acquire and process to obtain target BRDF. This invention is benefit to improve measurement precision.

Description

Technical field [0001] The invention belongs to the field of remote sensing science and spectroscopy, and is specifically a method for measuring outdoor spectral BRDF. Background technique [0002] Most of the natural targets are non-Lambertian. The reflection characteristics of the target are related to the wavelength and the incident and reflection geometric positions. The Bidirectional Reflectance Distribution Function can accurately describe this anisotropy of the object. The definition of the bidirectional reflection distribution function (BRDF) is: the target in a certain direction (θ r , Φ r ) DL r [W·m -2 ·Sr -1 ·Nm -1 ] And the incident direction (θ i , Φ i )Illuminance dE i [W·m -2 ·Nm -1 ] Ratio ( figure 1 ). f r [sr -1 ] Stands for BRDF, expressed as: [0003] [0004] θ i : Incident zenith angle; Azimuth angle of incidence; θ r : Reflection zenith angle; Reflection azimuth; dE i : Incident illuminance; dL r : Reflected brightness [0005] Outdoor BRDF (Bidirectional ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/55G01N21/47G01J3/42
Inventor 李新郑小兵洪津汪元钧张运杰汤伟平吴浩宇寻丽娜王乐意乔延利
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI