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

Table 3

Data of FBG tensile strain test.

Load times	Load		Fiber Bragg Grating strain detected/
	Load/	Tension/	FBG1	FBG2	FBG3
0	0	0	0	0	0
1	6.53	2.22	165	106	5
2	13.06	4.44	235	196	8
3	19.59	6.66	347	290	12
4	26.12	8.88	451	413	15
5	32.65	11.1	573	506	18
6	39.18	13.32	650	560	22
7	45.71	15.54	761	669	25
8	52.24	17.76	875	734	28
9	58.8	20	970	836	32
10	64.68	22	1082	951	37
11	70.56	24	1164	1070	41
12	76.44	26	1264	1206	44