[1] [1] GUBIN V P, ISAEV V A, MORSHNEV S K, et al. Use of Spun optical fibres in current sensors［J］. Quantum Electronics, 2006, 36(3): 287-291

[2] [2] GALTAROSSA A, GRIGGIO P, PALMIERI L, et al. Polarization properties of randomly-birefringent spun fibers［J］. Optical Fiber Technology, 2006, 12(3): 205-216..

[3] [3] PENG N, HUANG Y, WANG S, et al. Fiber optic current sensor based on special spun highly birefringent fiber［J］. IEEE Photonics Technology Letters, 2013, 25(17): 1668-1671.

[4] [4] AMPEM-LASSEN E, HUNTINGTONS T, DRAGOMIR N M, et al. Refractive index profiling of axially symmetric optical fibers: a new technique［J］. Optics Express, 2005, 13(9): 3277-3282.

[5] [5] WHITE K I. Practical application of the refracted near-field technique for the measurement of optical fibre refractive index profiles［J］. Optical and Quantum Electronics, 1979, 11(2): 185-196.

[6] [6] GISIN N, PASSY R, PEMY B. Optical fiber characterization by simultaneous measurement of the transmitted and refracted near field［J］. Journal of Lightwave Technology, 1993, 11(11): 1875-1883.

[7] [7] WAHBA H H, KREIS T. Characterization of optical fibers by digital holographic interferometry［C］. SPIE Europe Optical Metrology. International Society for Optics and Photonics, 2009: 73890K.

[8] [8] WAHBA H H, KREIS T. Characterization of graded index optical fibers by digital holographic interferometry［J］. Applied Optics, 2009, 48(8): 1573-1582.

[9] [9] WAHBA H H. Reconstruction of 3D refractive index profiles of PM PANDA optical fiber using digital holographic method［J］. Optical Fiber Technology, 2014, 20(5): 520-526.

[10] [10] ZHOU Wen-jing, YU Ying-jie, XU Qing-sheng. Micro-structure measurement of phase grating based digital micro-holography［J］. Acta Photonica Sinica, 2008, 37(11): 2234-2238.

[11] [11] PAN Z L, LI S P, ZHONG J G. Digital holographic microtomography for geometric parameter measurement of optical fiber［J］. Optical Engineering, 2013, 52(3): 035801.

[12] [12] PAN Zhe-lang, LI Shi-ping, ZHONG Jin-gang. Measurement of inner diameter and wall thickness for micro-capillary by digital holographic tomography［J］. Optics and Precision Engineering, 2013, 21(7): 1643-1650.

[13] [13] SU Ling-long, MA Li-hong, WANG Hui, et al. Three-dimensional refractive index quantitative measurement for optical fiber by digital holographic tomography［J］. Chinese Journal of Lasers, 2013, 40(10): 188-193.

[14] [14] GU Ting-ting, HUANG Su-juan, YAN Cheng, et al. Refractive index measurement research for optical fiber based on digital hologram［J］. Acta Physica Sinica, 2014, 64(6): 064204

[15] [15] YAN C, HUANG S J, MIAO Z, et al. 3D refractive index measurements of special optical fibers［J］. Optical Fiber Technology, 2016, 31: 65-73.

[16] [16] SOKKAR T Z N, EL-FARAHATY K A, RAMADAN W A, et al. Nonray‐tracing determination of the 3D refractive index profile of polymeric fibres using single‐frame computed tomography and digital holographic interferometric technique［J］. Journal of Microscopy, 2015, 257(3): 208-216.

[17] [17] LI Jun-chang. FFT Computation of angular spectrum diffraction formula and its application in wavefront reconstruction of digital holography［J］. Acta Optica Sinica, 2009, 29(5): 1163-1167.

[18] [18] WANG T J, SZE T W. The image moment method for the limited range CT image reconstruction and pattern recognition［J］. Pattern Recognition, 2001, 34(11): 2145-2154.