Development the method of direct phase demodulation Fabry–Perot interferometer for temperature measurements using frequency scanning

Kazachkova, I.D., Plotnikov, M.Y., Konnov, K.A., Konnov, D.A.

Publication in Journal of Optical Technology

For Russian citation (Opticheskii Zhurnal):

Казачкова И.Д., Плотников М.Ю., Коннов К.А., Коннов Д.А. Разработка метода прямой демодуляции фазы интерферометра Фабри–Перо для температурных измерений с использованием частотного сканирования // Оптический журнал. 2023. Т. 90. № 7. С. 86–93. http://doi.org/10.17586/1023-5086-2023-90-07-86-93

Kazachkova I.D., Plotnikov M.Y., Konnov K.A., Konnov D.A. Development the method of direct phase demodulation Fabry–Perot interferometer for temperature measurements using frequency scanning [in Russian] // Opticheskii Zhurnal. 2023. V. 90. № 7. P. 86–93. http://doi.org/10.17586/1023-5086-2023-90-07-86-93

For citation (Journal of Optical Technology):

Irina D. Kazachkova, Michael Y. Plotnikov, Kirill A. Konnov, and Dmitriy A. Konnov, "Development of a direct phase demodulation method for a Fabry-Pérot interferometer for temperature measurements using frequency scanning," Journal of Optical Technology. 90(7), 405-409 (2023). https://doi.org/10.1364/JOT.90.000405

Abstract:

Subject of study. The spectral characteristics of interference signal were studied using the method of direct phase demodulation for interrogator of fiber-optic sensor for high-temperature measurements. The aim of study is development of the method for measurement of absolute temperature of Fabry–Perot interferometer based on phase demodulation using frequency scanning. Method. A mathematical model of direct phase demodulation was implemented in the MATLAB environment. The developed method allows evaluating the change in the optical length of the interferometer under the influence of temperature by performing frequency modulation of the wavelength of the optical source according to the periodic sawtooth law. As a result of multipath interference in the resonator of Fabry–Perot interferometer, the photodetector registers a reflected interference response with a complex spectral composition. The current value of the phase difference in the interferometer is restored by estimation of the position of the local minima of the interference signal, and the absolute temperature of the interferometer is determined. Main results. The results of mathematical modeling of the method of direct phase demodulation for the wavelength range of the optical source 1308–1310 nm are presented. The length of the interferometer resonator was matched to the allowable range of vertical-cavity surface-emitting laser wavelength tuning to achieve the maximum phase sensitivity. The digital filter for the phase demodulation method of Fabry–Perot interferometer was selected and the potential accuracy of the temperature determination method was calculated considering the presence of noise in the measuring system. Practical significance. The method proposed in this work can be used in the interrogation system of the fiber-optic interferometric Fabry–Perot sensors, as well as for high-precision temperature monitoring systems above 300 °C.

Keywords:

fiber optic sensor, Fabry–Perot interferometer, phase demodulation, interrogator, temperature measurement

OCIS codes: 120.5050, 120.2230, 060.2370,070.6020

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