Charge-coupled device (CCD) sensors are used in many of today’s advanced digital cameras and imaging systems. CCDs were first developed in 1969 by physicists Willard Boyle and George Smith. They based CCD technology on Albert Einstein’s theory of the photoelectric effect, through which light is converted into electrons. A CCD sensor captures those electron signals in the form of image points, or pixels, enabling them to be read digitally.
In this article, we discuss unique measurement considerations for ensuring the quality of LED sources, and equipment for measuring LED displays, individual sources, and luminaires.
Southern California-based Deco Lighting is a manufacturer of innovative and intelligent LED lighting solutions. Learn how Radiant's Near-Field Measurement System is helping this leading company to deliver value to its customers.
For optical design and product qualification, the output color and luminance distributions of large light sources are needed to qualify and predict the performance of architectural, automotive, street, security, entertainment and other lighting systems. However, these distributions are difficult to measure because of both the size of the source and the large space required for the measurement.
In this article, we describe a method for the measurement of large light sources in a limited space that efficiently overcomes the physical limitations of traditional far-field measurement techniques. The measurement is performed from within the near-field of the light source, enabling a compact measurement set-up, and generates a detailed near-field color and luminance distribution model that can be directly converted to ray sets for optical design and that can be extrapolated to far-field
Take a look at the basic operating principles and performance tradeoffs of imaging colorimeters, a class of instruments that enable spatially resolved measurements of color and luminance that are directly applicable to displays and solid-state sources.
The invention of the electric light bulb changed the world. It enables human activity at all times of day or night, and in all ambient light conditions. The first commercially available bulbs were released in 1880, manufactured by Thomas Edison’s company, the Edison Electric Light Company. The resulting demand for electric lighting propelled the building of vast electrical distribution infrastructure to bring power to homes and businesses in the following decades.
In this article, learn how photometric and colorimetric technology matches the visual sensitivity of human vision. We discuss the advantages and applications of CCD imaging for light and color measurement, as well as component and surface inspection, that most accurately reflects the human visual experience.
This year’s Nobel Prizes in physics were announced on October 2. The three recipients include American Arthur Ashkin, at 96 the oldest Nobel Laureate, for his work developing “optical tweezers.” The other 2018 recipients are Frenchman Gerard Mourou and Canadian Donna Strickland—only the third woman in history to ever receive the Nobel for Physics—for their work with pulsed lasers.
The PM-NFMS™ system performs brightness and color measurements as a function of view angle for large light sources. It provides accurate near-field luminance distribution data for developers of large light sources, for automotive, transportation, architectural, and other applications.
Scientific methods allow us to understand and quantify our perception of visible light and color. In this infographic, you will learn the language of light, understand color spaces and color matching functions, and other principles of light & color measurement. This tool is a useful reference for anyone with a passion for light metrology, or who works in applications dealing with light & color measurement.
The properties of light that stimulate the eye and build our visual perception—when thoughtfully designed into lighted devices—can create unrivalled visual experiences. Thanks to well-established scientific methods, we can quantify the human eye's response to light in a mathematical context for use in optical metrology.
The most important part of any camera is the lens, which directs light in ways that create images to mirror reality. Today’s photographic lenses are sophisticated instruments composed of multiple elements (individual glass or plastic lens discs), paired with an aperture, shutter, and controls, all arranged along a central axis, and held within the lens casing.
Blue light has been getting some attention in popular news lately regarding the potential negative effects of exposure to humans. The widespread adoption of phosphor-coated white LEDs (which encompass blue light wavelengths) in everyday use has raised concerns and spurred new research. Blue light from LED-based display devices such as smart phones and laptops has sometimes been blamed for retinal damage, insomnia, and even cancer.
Human visual perception is the ultimate standard of quality for any lighting or display product that’s intended to be viewed by humans. No machine vision or other sensing system has been able to fully replicate the level of discernment and accuracy of the human eye, but we can get very close using CCD-based imaging technology.
Did you know that 2019 is the 150th anniversary of the periodic table of elements? In 1869, Russian chemistry professor Dmitri Mendeleev published his version of a periodic table, which gained broad acceptance for two reasons: