Wuhan Guide IR136 Uživatelský manuál stáhnout pdf (Strana 72)

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

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Fluorescence

The spectral emission of long wave radiation such as visible or infrared illumination by some materials

when stimulated shorter wave radiation.

Focus

The ability of a lens or system to bring image radiation to a point of convergence within the confines of the

active detector sensing area.

Focal Length

The distance from the convergent point for the radiation (focal point) to its affiliated principal plane.

Focal Plane

The plane created by mapping the points of convergence for rays which pass through a lens assembly from

an object which is moved on a plane perpendicular to the optical axis at great distance from the lens

assembly (i.e. collimated rays). For a detector to work properly, all of its active elements must be placed in

the same focal plane for such an object. Otherwise, portions of the object space will appear defocused.

Frame Memory

A digital memory, usually of dynamic RAM chips, which is used to contain the entire image data scene at

once. This is usually a bit mapped memory where each pixel of image data is located in it properly scaled x

and y location. It is usually in the frame memory that the image scan conversion is completed.

Frequency

The number of cycles an operation occupies per period of time. The normal unit of measurement for

frequency is Hertz.

Front Surface Mirror

A mirror whose reflective surface is on the same side as the incident radiation. Front surface mirrors coated

for maximum reflection are normally used in infrared optics to maximize the signal strength of the reflected

radiation.

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Wuhan Guide IR136 Uživatelský manuál Strana 72