photometers

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• photometers — pho·tom·e·ter || fəʊ tÉ‘mɪtÉ™(r) / tÉ’ n. device used to measure the intensity of light …   English contemporary dictionary

• Photometrie [1] — Photometrie (Lichtmessung) wird in der Regel in zwei Gruppen eingeteilt: 1. die optische Photometrie; 2. die chemische Photometrie. Vgl. a. Beleuchtungsgrundsätze. I. Optische Photometrie. Photometer sind Vorrichtungen zum Messen von Helligkeiten …   Lexikon der gesamten Technik

• Photometry (optics) — This article deals with the usage of this term in optics and lighting .Photometry is the science of measurement of light, in terms of its perceived brightness to the human eye. It is distinct from radiometry, which is the science of measurement… …   Wikipedia

• Fettfleck-Photometer — Das sogenannte Fettfleck Photometer nach Robert Wilhelm Bunsen ermöglicht es, Lichtstärken einfach zu vergleichen. Inhaltsverzeichnis 1 Versuchsaufbau 2 Beispiel für eine Messung mithilfe des Fettfleck Photometers 3 Siehe auch …   Deutsch Wikipedia

• Photometer — In the broadest sense, a photometer is any instrument used to measure illuminance or irradiance. As applied in industrial photometry, a photometer is the general term covering instruments for detecting:*scattered light intensity *absorption… …   Wikipedia

• Photographic magnitude — Before the advent of photometers which accurately measure the brightness of astronomical objects, the apparent magnitude of an object was obtained by taking a picture of it with a camera. These images, made on photoemulsive film, were more… …   Wikipedia

• Methods of detecting extrasolar planets — Any planet is an extremely faint light source compared to its parent star. In addition to the intrinsic difficulty of detecting such a faint light source, the light from the parent star causes a glare that washes it out. For those reasons, only a …   Wikipedia

• Photometrie — Bei dem Photometer von Leonhard Weber vergleicht man die Helligkeiten zweier Milchglasplatten a in Rohr A und b in Rohr B (Fig. 1), von denen letztere zunächst durch die zu untersuchende Lichtquelle y beleuchtet wird, während a von der… …   Meyers Großes Konversations-Lexikon

• Multiangle light scattering — (MALS) is a technique for determining, independently, the absolute molar mass and the average size of particles in solution, by detecting how they scatter light. Collimated light from a laser source is most often used, in which case the technique …   Wikipedia

• Photometer — Fotometer * * * Pho|to|me|ter 〈n. 13〉 = Fotometer * * * Photometer   das, s/ , Fotometer, Gerät zur direkten Messung photometrischer Größen. Dient das Auge eines Normalbeobachters als Lichtempfänger, so spricht man von visuellen (subjektiven)… …   Universal-Lexikon

• Mariner 4 — Operator NASA Mission type Flyby Flyby of Mars …   Wikipedia