Application of the Microclamped Fiber Bragg Grating (FBG) Sensor in Rock Bolt Support Quality Monitoring

Table 2

The calibration data of the force-measuring bolts integrated with the microclamped FBG.

Load/kN	Average wavelength drift of FBG1/nm	Average wavelength drift of FBG2/nm	Average wavelength drift of FBG3/nm
0	0	0	0
10	0.1758	0.1828	0.2204
20	0.3706	0.4595	0.5396
30	0.5954	0.7167	0.7549
40	0.7961	0.9882	1.1661
50	0.9759	1.0718	1.3626
60	1.1333	1.3341	1.6213
70	1.3509	1.6548	1.9028
80	1.6135	1.7880	2.3491
90	1.7680	2.1681	2.5352
100	1.8881	2.2510	2.7985