Experimental Study on Slope Deformation Monitoring Based on a Combined Optical Fiber Transducer

Table 5

Comparison of this method with other methods.

Testing method	Precision of initial measurement		Max sliding distance		Dynamic range (mm)	Determination of the loading direction	Unit price (USD/m)
	Value (mm)	Reflectometry Correlation/loss	Value (mm)	Reflectometry Correlation/loss
TDR [4]	5.0	0.005 ()	25.4	0.123 ()	0–20.4	Can not	13.5
Single fiber [17]	0.3	0.5 (dB)	3.60	54 (dB)	0–3.3	Can not	0.03
COFT [14, 15]	1	0.11 (dB)	26.5	9.1 (dB)	0–23.2	Can	0.2