Fiber gratings to nuclear power plant Temelin and theirs calibration by laser interferometer

We present application of the optical fiber sensors to measurement the shape deformation of the containment of the nuclear power station Temelin. The presented method can be used to measure any concrete buildings. To prepare optical fiber sensors we developed method of measurement of fiber Bragg gratings (FBG) stretching by laser interferometer. We are oriented to research, development and to methodology of the production and application of FBGs. The elongation of FBGs can calculated from frequency drift of the Bragg resonance wavelength and from the change of the grating period during stretching