Publication

Bi-directional Photogoniometer for advanced glazing materials based on digital imaging techniques

Marilyne Andersen
1999
Media

Abstract

The photogoniometer is composed of a computer-controlled movable mechanical support, presenting two main rotation axes that are powered by DC motors. It uses an accurate and reliable gear technology (harmonic drivers) and is controlled by a micro-computer. The light source is placed 6 meters above. It consists of a short-arc discharge lamp (2.5 kW HMI) combining high luminous efficiency (96 lumen/Watt) with a daylight-close spectum (5600 K); it is placed in a floodlight projector equiped with a hyperbolic mirrored reflector, Fresnel lens and an optical conic element to enhance beam uniformity. A high illuminance uniformity is observed on the sample (better than 3%).

Official source

https://infoscience.epfl.ch/entities/publication/1af594a5-baaf-48fb-a178-a5aa60af89e7

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Marilyne Andersen
1999
Media

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/1af594a5-baaf-48fb-a178-a5aa60af89e7

About this result

Related concepts (32)

Gas-discharge lamp

Gas-discharge lamps are a family of artificial light sources that generate light by sending an electric discharge through an ionized gas, a plasma. Typically, such lamps use a noble gas (argon, neon, krypton, and xenon) or a mixture of these gases. Some include additional substances, such as mercury, sodium, and metal halides, which are vaporized during start-up to become part of the gas mixture. Single-ended self-starting lamps are insulated with a mica disc and contained in a borosilicate glass gas discharge tube (arc tube) and a metal cap.

High-intensity discharge lamp

High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten electrodes housed inside a translucent or transparent fused quartz or fused alumina arc tube. This tube is filled with noble gas and often also contains suitable metal or metal salts. The noble gas enables the arc's initial strike. Once the arc is started, it heats and evaporates the metallic admixture.

Arc lamp

An arc lamp or arc light is a lamp that produces light by an electric arc (also called a voltaic arc). The carbon arc light, which consists of an arc between carbon electrodes in air, invented by Humphry Davy in the first decade of the 1800s, was the first practical electric light. It was widely used starting in the 1870s for street and large building lighting until it was superseded by the incandescent light in the early 20th century.

Related publications (1)

Bi-directional Photogoniometer for advanced glazing materials based on digital imaging techniques

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