Review: distributed time-domain sensors based on Brillouin scattering and FWM enhanced SBS for temperature, strain and acoustic wave detection

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Table 1 Comparison of the proposed BOTDA schemes in this work

	[40] compound spectrum analysis method in 1998	[41] Dark pulse in 2005	[42] Ppp method in 2005	[44] Dpp method in 2009	[45] Brillouin echo technique in 2010	[83] tailored compensation in 2017	[84] Image Denoising methods in 2018
Spatial Resolution	50 cm	5 cm	10 cm	10 cm	5 cm	20 cm	2 m
Sensing Accuracy	40 μɛ	±20 μɛ	25 μɛ	16 μɛ	60 μɛ	29 μɛ	20 μɛ
Sensing Range	100 m	100 m	kilometers	12 km	5 km	51.2 km	100 km