Research Article
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 |
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