In this paper, accuracy calibration experiments and the related analyses of two fiber-optic sensing technologies, the fiber-optic grating (FBG) and optical frequency domain reflectometry (OFDR), are carried out using a standard beam of equal strength and a mature resistive. In this paper, accuracy calibration experiments and the related analyses of two fiber-optic sensing technologies, the fiber-optic grating (FBG) and optical frequency domain reflectometry (OFDR), are carried out using a standard beam of equal strength and a mature resistive. In this paper, accuracy calibration experiments and the related analyses of two fiber-optic sensing technologies, the fiber-optic grating (FBG) and optical frequency domain reflectometry (OFDR), are carried out using a standard beam of equal strength and a mature resistive strain gauge (ESG). The. Fraunhofer IPT develops fiber-optic sensors for challenging measurement tasks such as measuring the smallest of boreholes. Using fiber-integrated beam steering and shaping, individual sensors up to a diameter of 80 microns can be manufactured. Therefore, we decided to commercialize the results of our successful research activities in a university spin-off (www. OFDR technology (O ptical F requency D omain R eflectometry) makes it possible to carry out measurements with very high resolution and high readout rates using fibre optic sensors. The. The scope of the book includes the following chapters: 1. The chapters in this edited volume are by scholars/experts working in academia in Taiwan, Egypt, Israel, Germany and Japan.