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Related Experiment Video

Updated: Jul 6, 2026

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

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Published on: May 20, 2013

Instrument to measure the bidirectional reflectance distribution function of surfaces.

K J Voss, A Chapin, M Monti

|March 21, 2008

Summary

A novel instrument precisely measures the in situ bidirectional reflectance distribution function (BRDF) of surfaces across various angles and colors. This advancement offers accurate BRDF data for diverse applications.

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Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Diffuse Reflectance Spectroscopy: Getting the Capillary Refill Test Under One's Thumb

Published on: December 2, 2017

Area of Science:

Optics and Photonics
Surface Science
Remote Sensing

Background:

Accurate measurement of surface optical properties is crucial for applications in remote sensing, computer graphics, and material science.
Existing methods for measuring the bidirectional reflectance distribution function (BRDF) often lack in situ capabilities or comprehensive angular coverage.

Purpose of the Study:

To introduce and validate a new instrument designed for in situ measurement of the bidirectional reflectance distribution function (BRDF).
To demonstrate the instrument's capability in capturing detailed BRDF data across a wide range of illumination and viewing angles and multiple wavelengths.

Main Methods:

The instrument measures BRDF for eight illumination zenith angles (0-65 degrees) and over 100 viewing angles (zenith: 5-65 degrees; azimuth: 0 to ±180 degrees).
Measurements were conducted using three specific color wavelengths: 475 nm, 570 nm, and 658 nm.
System performance was evaluated through extensive testing on flat surfaces.

Main Results:

The instrument achieves a measurement precision of 1-5% for the BRDF of flat surfaces.
The accuracy of the measured reflectance is within 10% of the actual value.
Sample BRDF data for dry and wet sand were successfully acquired and presented.

Conclusions:

The developed instrument provides a reliable and precise method for in situ BRDF measurements.
The instrument's capabilities are demonstrated through the analysis of sand samples, highlighting its utility in surface characterization.
This new tool enhances the ability to study surface optical properties under realistic conditions.