Reflectometer for measuring the bidirectional reflectance of rough surfaces.
نویسندگان
چکیده
A fully automatic, four-axis gonioreflectometer is described. It has an angular accuracy of 0.3 degrees and a range of 90 degrees in both the theta(i) and the theta(r) zenith angles. The gonioreflectometer is simpler than previous designs because of its use of rotating arms rather than moving carriages to mount the optical components. Where possible, commercial components have been used to reduce the cost. A novel off-axis angular encoding scheme is also described.
منابع مشابه
NIST High Accuracy Reference Reflectometer-Spectrophotometer
A new reflectometer-spectrophotometer has been designed and constructed using state-of-the-art technology to enhance optical properties of materials measurements over the ultraviolet, visible, and near-infrared (UV-Vis-NIR) wavelength range (200 nm to 2500 nm). The instrument, Spectral Tri-function Automated Reference Reflectometer (STARR), is capable of measuring specular and diffuse reflectan...
متن کاملReflectance from locally glossy thoroughly pitted surfaces
Current reflectance models for glossy surfaces assume that the reflectance from such objects can be represented by a linear combination of specular and diffuse reflectance functions. This assumption is based on the physics of reflectance of smooth dielectric materials such as plastic and holds quite well for perfectly smooth convex dielectric objects such as billiard balls. In this paper, howev...
متن کاملBidirektionale Reflektanz von städtischen Oberflächen (Bidirectional Reflectance of Urban Surfaces) Dissertation zur Erlangung des Doktorgrades des Fachbereichs Physik der Universität Hamburg
The reflectance of a surface usually depends on the angles, at which the surface is illuminated and viewed. The dependence can be described by the Bidirectional Reflectance Distribution Function BRDF. In this study, the BRDFs of several samples typically found in urban areas (roof tiles, asphalt, etc.) were measured at the European Goniometric Facility EGO in Ispra, Italy with hyperspectral sen...
متن کاملUse of Virtual Surfaces for Prediction of Real Rough Soil Surfaces Brightness in Any Illumination and Viewing Conditions
Virtual surfaces discussed in the paper are sets of input data of the geometrical model of soil bidirectional reflectance in the optical domain which predict the reflectance behaviour of rough soil surfaces in any illumination and viewing conditions. Equal-sized opaque spheroids lying on a freely sloping plane, describe the soil surface. They are absorbed into the ground of the slope plane havi...
متن کاملSimple equation to approximate the bidirectional reflectance from vegetative canopies and bare soil surfaces.
A simple equation has been developed for describing the bidirectional reflectance of some vegetative canopies and bare soil surfaces. The equation describes directional reflectance as a function of zenith and azimuth view angles and solar azimuth angle. The equation works for simulated and field measured red and IR reflectance under clear sky conditions. Hemispherical reflectance can be calcula...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Applied optics
دوره 37 16 شماره
صفحات -
تاریخ انتشار 1998