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Theoretical investigation of physical parameters measurements of a liquid in a vessel using optoelectronic oscillators

机译：Theoretical investigation of physical parameters measurements of a liquid in a vessel using optoelectronic oscillators

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Abstract Real-time access to the physical parameters of a liquid such as temperature, refractive index, and depth in a vessel could contribute to preserving the quality of the liquid. In this study, the optoelectronic oscillator-based measurement of these physical parameters is discussed. The refractive index, the temperature, and the depth of the liquid are translated into a variation in the oscillation frequency of the optoelectronic oscillators. For the temperature and refractive index, the phase-shifted fiber Bragg grating immersed in the liquid acts as a sensor. Contrariwise, the depth measurement of the liquid is achieved through the round-trip flow of the light in the vessel. Using appropriate values of the system parameters, the theoretical sensitivities for the temperature and depth were reported as 283 MHz/°C and 421.94MHz/cmdocumentclass12pt{minimal} usepackage{amsmath} usepackage{wasysym} usepackage{amsfonts} usepackage{amssymb} usepackage{amsbsy} usepackage{mathrsfs} usepackage{upgreek} setlength{oddsidemargin}{-69pt} begin{document}$$421.94, text{MHz/cm}$$end{document}, respectively. It is also noticed that when tuning the cubic-nonlinear parameter, the cubic-nonlinear optoelectronic oscillator significantly increases the measurement sensitivity.

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