[1] LIU R Q, LIU P K, FU ZH, et al..Operation principle of a bend enhanced curvature optical fiber sensor ［J］.Acta Optica Sinica, 2007,27(5):807-812.(in Chinese)

[2] GENTILE C, WALLACE M.Angular displacement sensors ［P］.United States: 5086785, 1992.

[3] QIAN J W, SUN L CH, SHEN L Y, et al..On sensing apparatus for bending deformation in trenchless underground pipeline detection ［J］.Opt.Precision Eng., 2005,13(2):179-184.(in Chinese)

[4] ZHAO SH G, WANG X, YUAN L B.Four core fiber based bending sensor ［J］.Acta Optica Sinica, 2006, 26(7): 1001-1006.(in Chinese)

[5] DAVIS C, MAZZOLINI A.A new sensor for monitoring chest wall motion during high frequency oscillatory ventilation ［J］.Medical Engineering & Physics, 1999,21(9):619-623.

[6] DANIAH L.Fiber optic bending and positioning sensor including a light emission surface formed on a portion of a light guide ［P］.United States: 5321257, 1994.

[7] DJORDJEVICH A.Thin Structure deflection measurement ［J］.IEEE Transactions on Instrumentation and Measurement, 1999,48(3):705-710.

[8] KOVACEVIC M S, DJORDJEVICH A, NIKEZIC D.Analytical optimization of optical fiber curvature gauges ［J］.IEEE Sensors Journal, 2008,8:227-232.

[9] DANISCH L, ENGLEHART K, TRIVETT A.Spatially continuous six degree of freedom position and orientation sensor ［J］.SPIE, 1999,3541:48-56.

[10] FAN H CH, QIAN J W, ZHANG Y N, et al..Sensor net work design for flexible surface shape measurement ［J］.Optics and Precision Engineering, 2008,16(6):1087-1092.(in Chinese)

[11] YANG D Y, WU J Q, QIAN J W.A research on the 3D reconstruction of the shape of the endoscope ［J］.Journal of Applied Sciences, 2003,21(4):406-410.(in Chinese)

[12] WU J Q, YANG D Y, QIAN J W.Calibration error analysis and way of calibration for spatial curvature measurement ［J］.Opt.Precision Eng., 2003,11(2):166-170.(in Chinese)

[13] FU Y L, DI H T.Simultaneous measurement of torsion and curvature using curvature fiber optic sensor ［J］.Key Engineering Material, 2008,392-394:400-405.