A device for multi-angle observation of brdf with non-lambertian bodies

Abstract

The invention relates to a device for observing a BRDF (Bidirectional Reflectance Distribution Function) in multiple angles through a non-Lambert reflector. The device is structurally characterized in that two semicircular I-shaped tracts are of concentric circles with an arc of an arched rocker; a sliding trolley is arranged on the tracks; four synchronous wheels are mounted at the bottom of the sliding trolley along the two semicircular I-shaped tracts and are respectively embedded into grooves of the two semicircular I-shaped tracts; the sliding trolley is internally provided with a singlechip and wireless remote control device, a pitching stepper motor and turbine worm speed reducer and an orientation stepper motor and turbine worm speed reducer; the orientation stepper motor and turbine worm speed reducer is connected with a manual adjusting wheel outside the trolley; a pitching scale disc is arranged on a side surface outside the sliding trolley; an arched pitching rocker is connected with the sliding trolley through an arched pitching arm pullback spring; a detector clamp is mounted at the other end of the arched pitching rocker. The device establishes a platform for a spectrograph and achieves the effect of improving the non-Lambert reflector BRDF observation precision.

Description

technical field [0001] The invention relates to a non-Lambertian multi-angle observation device for BRDF. Background technique [0002] At present, in field spectral data collection, manual hand-held methods are usually used to observe only the direction of the probe perpendicular to the surface, and rarely observe the spectral characteristics of different angles of ground objects. In fact, homogeneous medium and isotropic Lambertian is an idealized surface, while most natural surfaces are non-Lambert. Therefore, when observing the bidirectional reflectance distribution function (BRDF-BidirectionalReflectanceDistributionFunction) of the non-Lambertian surface, an auxiliary device must be used. Based on this, there are also some manual and automatic multi-angle observation frames for auxiliary measurement, but the platform mainly has the following problems: [0003] 1) The measurement is time-consuming. It takes 2 hours to complete a set of BRDF observations at intervals of...

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Problems solved by technology

[0003] 1) The measurement is time-consuming. It takes 2 hours to complete a set of BRDF observations at intervals of 10° (azimuth angle 0-360°, zenith angle 0-70°), and during the observation process, due to the change of the sun angle The observation results are inaccurate, and the time efficiency is difficult to meet the needs of the research;

[0004] 2) The angular accuracy is not enough, the angular accuracy of the observation device is usually above 5°, for accurate quantitative research, it is difficult for this observation device to meet the accuracy requirements;

[0005] 3) It is difficult for the observation device to ensure that the spectral observation can observe the same fixed point from different angles every time, and if there is heterogeneity on the observation surface, it will affect the observation results

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