Related Experiment Video
Updated: Jun 15, 2026
11:57
Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
Published on: May 20, 2013
Unified coordinate system for retroreflectance measurements
Applied Optics
|March 12, 2010
Summary
A new geometric system for measuring retroreflectance is proposed. This system aims for universal application and standardization in material properties.
Area of Science:
- Optics and Photonics
- Materials Science
- Measurement Science
Background:
- Retroreflectance is a critical property for various applications, including safety signage and vehicle lighting.
- Standardization of retroreflectance measurement is essential for consistent performance evaluation.
- Existing methods may lack universal applicability or a standardized geometric framework.
Purpose of the Study:
- To introduce a novel geometric system for specifying and measuring retroreflectance.
- To provide a foundation for a universally applicable standard in retroreflectance measurement.
- To facilitate the adoption of a recommended practice for retroreflectance characterization.
Main Methods:
- Development of a comprehensive geometric system based on established optical principles.
- Definition of precise parameters for specifying retroreflectance measurement geometries.
- Consideration of practical aspects for implementation in measurement devices.
Main Results:
- A defined geometric system suitable for universal retroreflectance specification and measurement.
- A framework proposed for international adoption as a recommended practice.
- Potential for enhanced consistency and comparability of retroreflectance data.
Conclusions:
- The proposed geometric system offers a standardized approach to retroreflectance measurement.
- Adoption of this system will improve the reliability and comparability of material retroreflectance data.
- This initiative by CIE Committee 2.3 aims to advance the field of optical materials characterization.
Related Concept Videos
01:13Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...
01:30Polar Coordinate System
The polar coordinate system provides a natural way to describe points in the plane when distances and directions are more meaningful than horizontal and vertical displacements. It is especially useful for modeling non-rectangular regions such as circles and spirals, where symmetry about a center point is easier to express than it is in a rectangular grid. A familiar example is a ship’s plan position indicator, which marks detected targets as dots positioned relative to the ship at the display’s...
01:29Radian and Degree Measure
Angular motion is measured using two primary units: degrees and radians. These units describe the extent of rotation around a fixed point. A complete rotation corresponds to 360 degrees or 2π radians, depending on the unit used. Although both represent the same angular displacement, they differ in origin and application.Degrees divide a circle into 360 equal segments. Due to its intuitive structure, this unit is historically rooted and widely used in general applications such as navigation,...
01:30Electronic Distance Measuring Instruments
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...
01:28Geoid and Ellipsoid
The Earth's shape is best described as an ellipsoid, a slightly flattened sphere created by rotating an ellipse around its minor axis. This flattening results in the polar axis being about 21 kilometers shorter than the equatorial axis. In contrast, the geoid represents the Earth's gravitational shape and aligns with the mean sea level (MSL). The geoid is an irregular equipotential surface where gravity is perpendicular at every point. Variations in Earth's mass distribution cause geoid...
01:02Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview
Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for electronic transitions. As a result...