https://doi.org/10.1051/epjconf/202532103007
Three-band interference filters for open flame sensors
Saint Petersburg State University of Aerospace Instrumentation, 67, Bol’shaya Morskaya st., Saint-Petersburg, 190000, Russian Federation
* Corresponding author: adele1993@mail.ru
Published online: 10 March 2025
This paper describes a methodology of synthesizing of interference filters for open flame sensors for the absorption line of 4.4 μm. Its feature is the simultaneous use of reference lines at two wavelengths: 4 and 5 μm. In addition, the paper provides calculations of the transmission spectra of the interference filter at these wavelengths on a sapphire substrate, which blocks long-wave radiation above 6 μm. The use of such filters will increase the reliability of detection of open flames by sensors.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
