Method Research of Coal Mine Roof Strain Detection Based on the Fiber Bragg Grating Sensor with Thermodynamic Couple Numerical Condition

Table 2

Data of FBG strain test.

Load times	Load		Fiber Bragg Grating Sensor Wavelength shift/pm			Temperature compensation/pm
	Load/	Tension/	FBG1	FBG2	FBG3	FBG4
0	0	0	0.34	0.34	0.34	0.341
1	6.52	2.21	200.02	127.70	6.12	0.132
2	13.05	4.43	284.29	238.00	11.00	0.204
3	19.58	6.65	419.10	349.30	14.50	0.150
4	26.11	8.87	544.40	498.69	19.50	0.201
5	32.64	11.0	691.22	610.52	21.80	0.126
6	39.17	13.31	784.12	674.50	26.81	0.331
7	45.70	15.53	917.85	807.16	31.77	0.473
8	52.23	17.75	1055.10	885.30	31.70	0.408
9	58.7	20	1168.27	1007.66	40.05	0.380
10	64.67	21	1304.40	1147.31	46.30	0.513
11	70.55	23	1401.86	1289.85	49.77	0.371
12	76.43	25	1523.38	1453.08	54.46	0.291