Cameras and imaging

Interference Bandpass Filters for Gas Sensors

May 31, 2018

Gas Detection Systems use Interference Bandpass Filters to identify the emission of a type of gas.

Different gases emit at a specific wavelength which makes it identifiable when using a relevant Interference Bandpass Filter.  These wavelengths are:

ü  Carbon Monoxide (CO) @ 4.73μm

ü  Nitric Oxide (NO) @ 5.24μm

ü  Nitrogen Dioxide (NO₂) @ 6.17μm

ü  Sulphur Dioxide (SO₂) @ 7.42μm

ü  Hydrogen Chloride (HCl) @ 3.55μm

ü  Carbon Dioxide (CO₂) @ 10.7μm

Knight Optical provide a wide range of interference bandpass filters that can be used with gas detection. The Interference Bandpass Filters would be need to transmit in the infrared region. These would be a customised item, which we are very experienced in. We provide narrow, standard, broadband and extra broadband filters with a high optical density of 4 as standard, however this can be customised for you.

Find out more information on our website regarding our Interference Bandpass Filter offerings and the various other optical components used in Gas Sensors that we can help with.

All our Interference Bandpass Filters  are fully inspected on their quality in our ISO 9001:2015 certified, state-of-the-art Metrology laboratory, using our Varian Cary 5000 for precise transmission/blocking data, and Starrett AV300 video microscope for high accuracy diameter testing. This allows us to work to the highest QA standards and meet the tolerance specifications on these precision components.


Contact our technical sales team to discover how Knight Optical’s high quality Interference Bandpass Filters bring quality into focus.

UK, Europe, Asia & RoW: E-Mail Tel 44 (0)1622 859444

USA & Canada: E-Mail usasales@knightoptical.comTel 001 401-583-7846