Abstract

We derive fundamental thermodynamic limits on the strain resolution of a class of fiber optic distributed acoustic sensing (DAS) techniques based on optical time domain reflectometry. The results indicate a lower limit of around $10^{-14}$ strain/ $\sqrt{\mathrm{Hz}}$ for a 2 m long (10 ns) optical pulse. These limits indicate that interrogation of unmodified fiber optic cable is unlikely to achieve sensing performance approaching that of engineered acoustic sensors.

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