Frequently used abbreviations of sensor technologies in the range of optics

This chapter explains frequently used abbreviations, which describe the optical behaviour of pyroelectric detectors. In addition, this section includes abbreviations connected with special characteristics of infrared filters.

AOI

Angle Of Incidence, see figure.

ARC

Anti-reflection coating is a single or multi layer coating without filter function to improve transmittance of windows or filters.

Cut-on/Cut-off

This is a possible form of specification of the NBP, it is the wavelength at 5 % or 50 % of peak transmission on both flanks (left side Cut-on, right side Cut-off).

CWL

Center wavelength is the center of the pass band of a band pass filter, see figure.

FOV

Here: Field of view of IR detector. It is mostly limited by the detector's aperture hole, see figure.

FSR

Free spectral range: the spacing in optical frequency or wavelength between two successive reflected or transmitted optical intensity maxima or minima of an interferometer.

FWHM

Full width half measure: Another vocable for HPBW.

HPBW

Half power Bandwidth: Bandwidth at 50 % of peak transmittance, see figure.

IR

Infrared: radiation with a wavelength between (0.78 and 1,000) µm.

LWP

Long Wave Pass is a filter with cut-on wavelength but no specification of cut-off. All wavelength longer than cut-on are able to pass, all wavelengths below are blocked. Opposite from SWP (Short Wave Pass), see figure.

MIR

Mid Infrared, radiation with a wavelength between (3 and 50) µm.

NBP

Narrow Band Pass is a band pass filter with a bandwidth of < 10 % of the center wavelength, see figure.

NIR

Near Infrared: Radiation with a wavelength between (0.78 and 3) µm.

UV

Ultraviolet (radiation), see figure.

VIS

Human visible radiation with a wavelength between (0.38 and 0.78) µm.

WBP

Wide Band Pass is a band pass filter with a bandwidth of > 10 % of the center wavelength, see figure.

Contact

Branch office:

InfraTec infrared Ltd
Chesterfield, UK
workPhone:+44 1246 267562

Headquarters:

InfraTec GmbH
Infrarotsensorik und Messtechnik
Dresden, GERMANY
workPhone:+49 351 871-8625
Fax:+49 351 871-8727
sensor@InfraTec.de

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