Abstract

The strain sensing performance of an optical fibre Bragg grating (FBG), demodulated using a state-of-the-art commercial interrogator, is compared directly with that of a fibre segment interferometer (FSI) of near equivalent gauge length. It is shown that the FSI segment displayed a 5 fold improvement in noise, $1\text{n}\epsilon /\sqrt{\text{Hz}}$ for a bandwidth of 1 kHz, compared to $5\text{n}\epsilon /\sqrt{\text{Hz}}$ at 1 kHz to that of the FBG. Furthermore, by exploiting a longer gauge length, it was also demonstrated that this could further reduce noise levels.

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