Wuhan Guide IR136 Manual do Utilizador descarregar pdf (Página 78)

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

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Micron (Micrometer)

A measurement of length in the metric system appropriate for measuring infrared radiation wavelengths.

1,000,000 microns equals one meter.

Microscope

An optical-assembly made for magnifying objects too small to be seen with the human eye. Infrared

microscopes operate in the infrared instead of the visible.

Mid Infrared (MWIR)

The middle infrared spectrum, usually from 2.4 to 7.0 microns.

Milli Radians

A measure of small angles. Two thousand-pi mill radians can be measured in a complete circle. There are

17.4 mrads per degree of angle.

Mosaic

See FPA - focal plane array.

Narrow Band Pass Filter

A multilayer filter usually based on interference effects whose cut-on and cut-off frequencies are very close

to each other. In infrared, the half width of a narrow band pass filter will be 0.5 to 1.0 micron.

Near Infrared (SWIR)

The shortest wavelength infrared radiation band - 0.7 to 1.4 microns.

Neutral Density Filter

A filter which attenuates radiation uniformly over a wide range of wavelengths; used in infrared systems as

a temperature range extension filter.

Noise

Unwanted signal interference - usually separated into various forms of signal cross talk and random noise

generated by means internal to the sensor.

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