Hydrogen Sulfide

Chemical Formula: H2S

Typical Detection Wavelength: 2.65µm

Filter Type: Narrow Bandpass (NBP)

Description: Hydrogen Sulfide can be found in a variety of both natural and industrial environments.  It is colourless but has a very distinctive odour that can be compared to the unpleasant smell of ‘rotten eggs’.  Hydrogen Sulfide gas is very poisonous and flammable, meaning that early detection is critical to health and safety. 

An infrared optical filter can be successfully used for the early detection and warning of the presence of Hydrogen Sulfide in the atmosphere, as the H2S gas absorbs IR radiation at a specific wavelength with typical absorption around 2.65µm.

Example Transmission Curve:

Centre Wavelength: 2.65µm ± 0.5%

Half Bandwidth: 300nm ± 30nm

Transmission Peak: >70%


Umicore has significant experience in producing IR Filters to the highest standards for the early detection of Hydrogen Sulfide and many other gasses.

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