Infrared – 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 Applications
The applications for IR filters are diverse. Ootee Optics supplies a broad range of infrared filters and coatings :
Environmental monitoring equipment
Emission monitoring for power plants and factories
Flame detection for petrochemical plants and oil rigs
Home and industrial security
Automotive exhaust analysis
Spectroscopy equipment
Ozone layer monitoring equipment
Blood analyzer equipment (breathalyzers)
IR cameras
Aircraft avionics
Missile and space applications
To determine your infrared filter requirement consider the kind and intensity of the source, detector characteristics, and optical path geometry.Ootee Optica will assist you in selecting a suitable standard IR filter or in developing the specification for a custom-made infrared filter.
