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Chapter 7 – Application of Graphene composites: Raman Strain Sensors sensors were calculated at two reference strain levels; 0.1 % and 0.3 % as shown in Figure 7.12a,d, Figure 7.14a,d, Figure 7.15a, Figure 7.16a and Figure 7.20a. It should be noted that, only the data where graphene in the composite coatings relaxed from its pre-strains were considered for the calculations (see Figure 7.12a,d, Figure 7.14a,d, Figure 7.15a, and Figure 7.16a). The calculated values of absolute accuracy and resolutions are given in Table 7-4. 7.3.3.1. Absolute accuracy – Example calculations In this context, the absolute accuracy of the system is defined as the accuracy in determining the strain levels. It could be calculated from the standard deviation of the difference in wavenumbers at one particular strain level to the ideal shift rate of that band. It could be explained with an example; Figure 7.21 is the applied strain and the response of 2D band for CVD graphene with uniform maximum strain levels. Figure 7.21: Applied strain and response of 2D band in model CVD coating. The absolute accuracy was calculated at 0.1% and 0.3% strain levels as indicated by the horizontal lines. It should be noted that for these calculations, only data after the relaxation of pre- strains were considered. The 2D band position at 0.1 % at 3rd deformation cycle was considered as the reference position (2646.36 cm-1). The calculations are shown in Table 7-3. 229PDF Image | PRODUCTION AND APPLICATIONS OF GRAPHENE AND ITS COMPOSITES
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