Wuhan Guide IR136 Instrukcja Użytkownika Pobierz pdf (Strona 64)

Thermografie in der Theorie und Praxis (INTERNET: www.irPOD.net / e-MAIL: [email protected] ) © Bernd Schindel 2007

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Infrared Glossary (internationale Begriffe in englischer Sprache)

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Absolute Temperature Scale

A temperature measurement scale based on the coldest possible temperature equal to 0 degrees. (See

Rankine and Kelvin).

Absorptions (Absorptive)

The ratio between the amount of energy absorbed and the total energy incident (irradiance), usually

measured at a surface. The absorption of a surface is equal to its emissivity.

Accuracy

A measure of the similarity of an instrument reading to the actual value for that reading. Instrument

accuracy is affected by many things - instrument drift, environment, temperature, time, operator expertise,

etc.

Active Element

The area on a detector which responds to radiation by creating a signal output. Many detectors contain

both unused (inactive) elements and unused areas which are not part of the active, or responsive element

area.

Active IR System

A system using an (active) IR source to illuminate a scene - much like a visible image scene is illuminated

with a flood light. An active IR system monitors the illuminated scene in much the same way as a passive

system.

Afocal

Usually refers to radiation in image space for a system adjusted for infinity focus. This radiation is fairly

telecentric, having a very long focal length (no-focal-length).

Ambient Temperature

The temperature of the surrounding air and environment considered the baseline measurement for heat

transfers around an object.

Amorphous

Having an irregular structure. Amorphous crystal structures are more useful in optical assemblies since

they are not as prone to fracture along a crystal boundary. Crystals can sometimes be converted from

mono-crystalline to poly-crystalline to amorphous by proper annealing.

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Wuhan Guide IR136 Instrukcja Użytkownika Strona 64