[1] [1] LUIGI R, MATTEO B, PAOLO P.Design of a high-Performance optical system for angular position measurement: optical and electronic strategies for uncertainty reduction ［J］.IEEE Transactions on Instrumentation and Measurement, 2005,54(5):2075-2081.

[2] [2] DONG L L, XIONG J W, WAN Q H.Development of photoelectric rotary encoders ［J］.Opt.Precision Eng., 2000,8(2):198-202.(in Chinese)

[3] [3] HONG X, XU ZH J, YANG N.Error compensation of optical encoder based on RBF network ［J］.Opt.Precision Eng., 2008,16(4):598-604.(in Chinese)

[4] [4] CHEN Y, SUN CH P, HE H Y.Research on the encoding method of single ring absolute code disc ［J］.Acta Photonica Sinica, 2006,35(3):460-463.(in Chinese)

[5] [5] CHEN Y, ZHAO X G.Research on single-ring absolute photoelectric shaft encoder ［J］.Acta Photonica Sinica, 2008,37(2):230-233.(in Chinese)

[6] [6] SU H B, LIU E H.Research on single ring absolute encoder and its application ［J］.Opt.Precision Eng., 2002,10(1):74-78.(in Chinese)

[7] [7] QIU C, WANG Y, ZHU H J.Absolute encoder based on karnnaugh map ［J］.Chinese Journal of Scientific Instrument, 2007,28(6):1080-1086.(in Chinese)

[8] [8] LUO C ZH, SUN Y, GAO L M, et al..Virtual absolute optical encoder ［J］.Acta Photonica Sinica, 2003,32(5):628-631.( in Chinese)

[9] [9] LUO SH K, WANG G Q, WANG J X, et al..Application of pseudorandom code in absolute photoelectric angle encoder ［J］.Opt.Precision Eng., 2003,11(6):596-601.(in Chinese)

[10] [10] WANG Y, QIU C, ZHU H J.Absolute encoder based on pseudorandom sequence ［J］.Acta Metrologica Sinica, 2007,24(2):118-123.(in Chinese)

[11] [11] KUNIO M, TADASHI T, MUNESADA Y.Features of a magnetic rotary encoder ［J］.IEEE Transactions on Magnetics, 1987,23(5):2182-2184.

[12] [12] SECO F, MARTIN J M, JIMENEZ A R.Improving the accuracy of magnetostrictive linear position sensors ［J］.IEEE Transactions on Instrumentation and Measurement, 2009,58(3):722-729.

[13] [13] RMAYER J R.High-resolution of rotary encoder analog quadrature signals ［J］.IEEE Transactions on Instrumentation and Measurement, 1994,43(3):494-498.

[14] [14] TAN K K, ZHOU H X, LEE T H.New interpolation method for quadrature encoder signals ［J］.IEEE Transactions on Instrumentation and Measurement, 2002,51(5):1073-1079.

[15] [15] HAO SH H, LIU Y, LIU J, et al..Design of single pair-pole magnetic encoder based on look-up table ［J］.Proceedings of CSEE, 2006,26(19):165-168.(in Chinese)

[16] [16] KIKUCHI Y, NAKAMURA E, WAKIWAKA H, et al..Consideration for a high resolution of magnetic rotary encoder ［J］.IEEE Transactions on Magnetics, 1996,32(5):4959-4961.

[17] [17] KIKUCHI Y, NAKAMURA E, WAKIWAKA H, et al..Consideration of magnetization and detection on magnetic rotary encoder using finite element method ［J］.IEEE Transactions on Magnetics, 1997,33(2):2159-2162.

[18] [18] QIU C, WANG Y, ZHU H J.Absolute encoder based on karnaugh map ［J］.Chinese Journal of Scientific Instrument, 2007,28(6):1080-1086.(in Chinese)