Application of Distributed Optical Fiber Sensing Technique in Monitoring the Ground Deformation

Table 1

The displacement values measured with micrometer and BOTDA.

Displacement (mm)	Optical fiber strain (με)	Displacement with micrometer (mm)	Displacement with BOTDA (mm)	Absolute error (mm)	Relative error (%)
4	708	4	3.54	0.46	11.5
8	1425	8	7.13	0.87	10.875
12	2210	12	11.05	0.95	7.917
16	3003	16	15.02	0.98	6.125
20	3838	20	19.19	0.81	4.05
24	4643	24	23.22	0.78	3.25
28	5481	28	27.41	0.59	2.107
32	6264	32	31.32	0.68	2.125
36	7045	36	35.23	0.77	2.139
40	7854	40	39.27	0.73	1.825
44	8673	44	43.37	0.63	1.432
48	9523	48	47.62	0.38	0.792
52	10343	52	51.72	0.28	0.538
56	11176	56	55.88	0.12	0.214
60	11997	60	59.99	0.01	0.017