Monitoring strain is important in precision engineering applications that require maintaining the precise alignments of structures over time such as those found in machine tools and metrology frames. We present a fiber optic strain measurement technique based upon broadband interferometry that is variously configurable in terms of gauge length and sensitivity. This is achieved by the use of an unbalanced interrogation interferometer configuration which alleviates the cavity length limit imposed by the temporal coherence of the system. We also demonstrate that dispersion in fiber sensors based on intrinsic Fabry-Perot interferometers must be considered to optimise performance. The possibility of multi-sensor interrogation using the same optical system is also reported.
|Number of pages||8|
|Journal||Journal of the Optical Society of America A: Optics and Image Science, and Vision|
|Early online date||2 Oct 2020|
|Publication status||Published - 1 Dec 2020|