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

Table 1

Resistance strain gauges experimental data under different tensile load.

Load times	Load		Load times	Resistance strain gauge measurements/
	Load/	Tension/		Resistance strain gauges 1	Resistance strain gauges 2	Resistance strain gauges 3
0	0	0	14:01:21	0	0	0
1	6.51	2.20	14:01:54	223	155	8
2	13.03	4.41	14:02:31	287	243	9
3	19.55	6.62	14:02:52	402	360	11
4	26.09	8.82	14:03:14	547	476	16
5	32.61	10.05	14:03:50	630	563	19
6	39.13	13.25	14:04:01	717	615	23
7	45.70	15.52	14:04:28	824	725	26
8	52.23	17.75	14:04:48	934	795	29
9	58.59	19	14:05:05	1028	887	33
10	64.66	21	14:05:34	1143	1008	37
11	70.54	23	14:05:55	1224	1133	40
12	76.42	24	14:06:21	1325	1263	44