空间比平时大。 数字相同，空间比平时大。
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\chapter[]{Experimental and grating sensors}
\textbf{jimmy GHFARD}
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\section{Introduction}
For both numerical and experimental inve using the following equation:
\begin{equation}
\varepsilon_{c}=\frac{\lambda_{k}-\lambda_{m}}{(1-\rho_{\varepsilon}) \lambda_{B}}
\label{eq:c_strain}
\end{equation}
where indexes \textit{m} and \textit{B} are related to measured and base Bragg wavelengths, respectively.
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