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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 detectors, low position accuracy, and many influencing factors, and achieve high spectral resolution, improved measurement accuracy, and accurate positioning Effect

Inactive Publication Date: 2007-03-14
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

Method used

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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

[0029] The main components of the measuring system of the present invention:

[0030] 1. Mechanical mechanism, including azimuth circle track and zenith arc track;

[0031] 2. Travel driving mechanism, including two servo motors and their driving parts;

[0032] 3. Spectral detectors, including visible-short-wave infrared continuous band radiance meters and irradiance meters of the same band;

[0033] 4. The overall control system, including electrical control, man-machine interface, control software and hardware, and computer communication modules.

[0034] Each component is described below:

[0035] The mechanical mechanism is a ground BRDF automatic measurement frame, including azimuth circle track 1, zenith arc semicircle track 2, driving car 3, sensor car 4 is installed on zenith arc semicircle track 2, and a spectral radiance meter is installed on the sensor car , the drive trolley 3 and the zenith arc semicircular track 2 are connected by 3 pull rods to form a space ...

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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 fields of remote sensing science and spectroscopy, in particular to a measurement method for outdoor spectral BRDF. Background technique [0002] Most of the targets in nature are non-Lambertian. The reflection characteristics of the target are related to the wavelength and the geometric position of the incident and reflection. Bidirectional Reflectance Distribution Function (Bidirectional Reflectance Distribution Function) can accurately describe the anisotropy of the object. The bidirectional reflectance distribution function (BRDF) is defined as: the target in a certain direction (θ r , φ r ) reflective brightness 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;  i : incident azimuth; θ r : reflection zenith angle;  r : reflection azimuth...

Claims

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Application Information

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Patent Type & Authority Applications(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
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