Investigation of stray light influence in spectrometers on precision of fiber-optic temperature sensor

Kabiev R.A., Gribaev, A.I., Miroshnichenko, G.P.

For Russian citation (Opticheskii Zhurnal):

Кабиев Р.А., Грибаев А.И., Мирошниченко Г.П. Влияние рассеянного излучения в спектрометрах на точностные характеристики волоконно-оптического датчика температуры // Оптический журнал. 2026. Т. 93. № 1. С. 50–58. http://doi.org/10.17586/1023-5086-2026-93-01-50-58

Kabiev R.A., Gribaev A.I., Miroshnichenko G.P. Investigation of stray light influence in spectrometers on precision of fiber-optic temperature sensor [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 1. P. 50–58. http://doi.org/10.17586/1023-5086-2026-93-01-50-58

For citation (Journal of Optical Technology):

Abstract:

Subject of study. Parasitic radiation caused by reflection and scattering on the internal surfaces and elements of Hamamatsu C12880MA mini-spectrometers. Aim of study. Reduction of the component of the measurement error of a fiber-optic temperature sensor, caused by the scattering of radiation outside the working spectral range of the spectrometer, by means of introducing an infrared filter into the pyrometer’s optical system. Method. The optical radiation of the СИ10-300 lamp in the temperature range of 1200–2300 K was registered in the presence and absence of СЗС25 colored glass in the sensor’s optical scheme. The analysis of the results included a comparison of the experimental data with the spectral characteristics of blackbody radiation. Temperature determination was performed by the method of spectral pyrometry in the 600–700 nm range. Main results. The presence of a parasitic signal in the 300–500 nm wavelength range, arising due to the scattering of radiation at wavelengths greater than 800 nm inside the device, was experimentally confirmed. A method for determining distortions in the spectrometer’s response, applied to analyze the contribution of scattered radiation in different spectral regions, is presented. A quantitative comparison of the magnitude of the parasitic signal in the sensor channels was performed. The introduction of an infrared filter into the optical system led to a substantial weakening of the parasitic radiation at lamp temperatures of 1200–1600 K and a reduction in the measurement error from 8% to 1.5%. Practical significance. The research results were used to improve the accuracy characteristics of the spectral fiber-optic temperature sensor.

Keywords:

spectral pyrometry, fiber optic sensor, spectrometer, blackbody, stray light, spectrum distortions

Acknowledgements:

the research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (project № FSER-2024-0006)

OCIS codes: 290.2648, 300.6190, 280.6780, 290.6815, 280.4991, 120.1740

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