Figure 4 | Scientific Reports

Figure 4

From: Rayleigh scatter based order of magnitude increase in distributed temperature and strain sensing by simple UV exposure of optical fibre

Figure 4

Examples of distributed measurements of temperature change.

(a) for a uniform temperature along the fibre (in a thermally stable and insulated container), the difference in noise between UV-exposed and un-exposed SMF-28 can be observed clearly. (b) For a local heating done by a thin wire (0.2 mm in diameter), we can observe the point spread function of the distributed sensor (spatial resolution) in UV-enhanced fibre. The curves (blue to red) are from an increasing current on the thin wire. As shown, a heating of 20 mK can be detected by such a distributed sensor. The sensor integration length was 2 cm, which is also shown by the width of the point spread function. A spatial averaging of surrounding points (1 cm wide) was performed to further reduce noise.

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