Narrow bandpass interference filters for infrared absorption gas analyzers

For Russian citation (Opticheskii Zhurnal):

Тропин А.Н. Узкополосные интерференционные фильтры для инфракрасных абсорбционных газоанализаторов // Оптический журнал. 2026. Т. 93. № 8. С. 67–73. http://doi.org/10.17586/1023-5086-2026-93-08-67-73

Tropin A.N. Narrow bandpass interference filters for infrared absorption gas analyzers [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 8. P. 67–73. http://doi.org/10.17586/1023-5086-2026-93-08-67-73

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Spectral transmission parameters of narrow bandpass infrared interference filters and their impact on performance in absorption gas analysis applications. Aim of study. Determination of the transmission wavelength at maximum (λmax) and half-width (Δλ0.5Tmax) of narrow bandpass infrared filters operating in the range of 7–12 µm and used for detection of some widely employed technical gases using infrared absorption spectroscopy method. Method. Mathematical modeling was performed using an expression that takes into account the spectral matching of narrow bandpass filter transmission spectra and characteristic infrared absorption spectra of analyzed gases. Main results. For such technological gases as sulfur hexafluoride (SF6), nitrogen trifluoride (NF3), octafluoropropane (C3F8), octafluorocyclobutane (C4F8), as well as certain types of freons, optimal values of λmax and Δλ0.5Tmax were determined, ensuring the sensitivity efficiency of optical gas sensors from the standpoint of the best spectral match between the shape of the gas absorption line and the filter’s transmission spectrum. The practical applicability of the obtained results is demonstrated through the creation of a narrow-band filter with a peak wavelength λmax = 10.57 µm, intended for detecting sulfur hexafluoride (SF6). Practical significance. The research findings obtained in this study serve as the basis for formulating technical requirements for designing and fabricating narrow-band infrared interference filters. Application of these filters is promising in the construction of optical sensors for monitoring technical gases using absorption infrared spectroscopy methods.

Keywords:

narrow bandpass interference filter, absorption spectroscopy, infrared gas analyzer

OCIS codes: 130.6010, 230.7408, 350.2460

References:

1. Hodgkinson J., Tatam R.P. Optical gas sensing: A review // Meas. Sci. Technol. 2013. № 24. P. 012004. DOI: 10.1088/0957-0233/24/1/012004
2. Jha R.K. Nondispersive infrared gas sensing technology: A review // IEEE Sensors Journal. 2022. V. 22. № 1. P. 6–15. DOI: 10.1109/JSEN.2021.3130034
3. Ramwell P.W. The infrared analysis of carbon dioxide during anaesthesia // Brit. J. Anaesth. 1957. № 29. P. 156–159. DOI: 10.1093/bja/29.4.156
4. Dubey R., Telles A., Nikkel J., Cao Ch., Gewirtzman J., Raymond P.A., Lee X. Low-cost CO2 NDIR sensors: Performance evaluation and calibration using machine learning techniques // Sensors. 2024. V. 24. P. 5675. DOI: 10.3390/s24175675
5. Popa D., Udrea F. Towards integrated mid-infrared gas sensors // Sensors. 2019.V. 19. P. 2076. DOI: 10.3390/s19092076
6. Xu M., Peng B., Zhu X., Guo Y. Multi-gas detection system based on non-dispersive infrared (NDIR) spectral technology // Sensors. 2022. V. 22. P. 836. DOI: 10.3390/s22030836
7. Kim Y., GooS.-G., Lim J.S. Multigas analyzer based on tunable filter non-dispersive infrared sensor: Application to the monitoring of eco-friendly gas insulated switchgears // Sensors.2022. V. 22. P. 8662. DOI: 10.3390/s22228662
8. Ельяшевич М.А. Атомная и молекулярная спектроскопия. М.: Гос. изд-во физ.-мат. лит., 1962. 892 с.
Elyashevich M.F. Atomic and molecular spectroscopy [in Russian]. Moscow: State publ. house of phys.-math. lit., 1962. 892 с.
9. Wang P., Fu X., Gibson D. et al. Optimised performance of non-dispersive infrared gas sensors using multilayer thin film bandpass filters // Coatings. 2018. V. 8. P. 472. DOI: 10.3390/coatings8120472
10. Electronic resource URL: https://webbook.nist.gov/ (NIST Chemistry WebBook).
11. Варфоломеев С.П., Горбунов Н.И., Дийков Л.К., Медведев Ф.К. Новые октроны для спектрально-аналитической аппаратуры // Компоненты и технологии. 2004. № 6. С. 46–49.
Varfolomeev S.P., Gorbunov N.I., Diikov L.K., Medvedev F.K. New octrons for spectrally analytical equipment // Components and technologies. 2004. № 6. P. 46–49.
12. Котликов Е.Н., Тропин А.Н. Оптические и структурные свойства пленок ZnS0,5Se0,5 и интерференционные фильтры на их основе // Оптический журнал. 2020. Т. 87. № 1. С. 56–61. DOI: 10.17586/1023-5086-2020-87-01-56-61
Kotlikov E.N., Tropin A.N. Optical and structural properties of ZnS0.5Se0.5 films and interference filters based on them [in Russian] // Journal of Optical Technology. 2020. V. 87. № 1. P. 45–49.DOI: 10.1364/JOT.87.000045