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IR Filter TechnologyInfrared - IR - filters are normally combinations of thin film deposition interference filters. Out of band blocking can be achieved by the proper choice of substrate, reflectance filter stacks or by adding absorption glass. The thin film infrared filters are comprised of stacks of thin layers (of different optical materials) in controlled thicknesses. Light is reflected at each film interface and by the correct choice of parameters can be made to interfere with that from other interfaces, constructively for certain wavelengths giving high reflectance, and destructively for others giving high transmittance. Long wave pass, short wave pass and bandpass filters can be designed and manufactured in this way.
IR Filter ApplicationsThe applications for IR filters are diverse. EOC supplies a broad range of mid infrared filters and coatings for a variety of detector applications including Pyroelectric, Thermopile, Lead Selenide (PbSe), Lead Salt (PbS) and MerCadTeluride (MCT) Detectors:
To determine your infrared filter requirement consider the kind and intensity of the source, detector characteristics, and optical path geometry. EOC will assist you in selecting a suitable standard IR filter or in developing the specification for a custom-made infrared filter. Mid IR Filter and Coating Types
Narrow Bandpass Filters (NBP) |
NBP Filter Scans
Wide Bandpass Filters (WBP) |
WBP Filter Scans
Long Wave Pass Filters (LWP) |
LWP Filter Scans
Short Wave Pass Filters (SWP)
Neutral Density Filters
AR
(Anti-Reflection) Coatings |
AR
Coating Scans IR Filter Technical Notes:
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