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Sensitivity for p mode as a function of α − ¯ α C for water ¯ n 2 = 1.3330 ( ) and water-glicerine 75% ¯ n 2 = 1.4353 ( with n 1 = 1.4865).

Sensitivity for p mode as a function of α − ¯ α C for water ¯ n 2 = 1.3330 ( ) and water-glicerine 75% ¯ n 2 = 1.4353 ( with n 1 = 1.4865).

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Figure 2: Moduli of Fresnel coefficients for s and p modes as a...
Figure 3: Phase of the Fresnel for s and p modes coefficients for the...
Figure 5: S ϕ s and S ϕ p as a function of α. ¯ n 2 = 1.3330 and two...
Figure 6: Sensitivity for p mode as a function of α − ¯ α C for water ¯...
Analytical study of optical dielectric interfaces for sensing applications
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  • Jul 2023
Dynamic optical sensors, as those based on the reflectivity of isotropic dielectrical interfaces, can be useful for measuring small changes in the refractive index of fluid media. Exact and approximated explicit formulas for their sensitivity are developed. These expressions clarify the influence of each of the constructive parameters of the device...
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... good way to compare different designs (geometry and materials) is to graph |S p | as a function of α − ¯ α C instead of α. This allows to compare the sensitivity in partial reflection and total reflection, plotting both cases in the same figure. Fig. 6 shows the sensitivity for this type of sensor for the p mode, using fixed n 1 = 1.4865 and different values for ¯ n 2 (¯ n 2 = 1.3330 and 1.4353). Since it diverges at ¯ α C , the graphs are made up to 0.04 o from ¯ α C . In partial reflection, the sensitivities are higher. Also, the closer ¯ n 2 is to n 1 , the greater the ...