A Multi-Range Fiber-Optical Non-Contact Displacement Micrometer


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A multi-fiber reflection displacement micrometer is developed. The device consists of a light source and a receiving fiber-array of identical fibers and photo detectors that detect the light reflected from the surface being measured. The differential output of each neighboring fiber pair is proportional to the surface displacement in a section of the total range. The light intensity variation of the source and the reflectance change of the surface are compensated when the differential output is divided by the summation output. A scale voltage is given to each output of neighboring fibers in order to shift each output to correspond to the actual displacement within the total range, which can be varied by selecting the number of fibers in the receiving fiber array. The micrometer offers the advantages of wide range, non-contact, no electrical interference, simplicity, and low cost. It can be used in medical experiments and laboratory instruments.



Key Engineering Materials (Volumes 295-296)

Edited by:

Yongsheng Gao, Shuetfung Tse and Wei Gao




G.J. Hwang and W.H. Ko, "A Multi-Range Fiber-Optical Non-Contact Displacement Micrometer", Key Engineering Materials, Vols. 295-296, pp. 307-312, 2005

Online since:

October 2005





[1] R.O. Cook and C.W. Hamm: Appl. Opt., Vol. 18 (1979), p.3230.

[2] T.E. Hansen: Sensors and Actuators, Vol. 4 (1983), p.545.

[3] W.H. Ko: IEEE Trans. Biomed. Eng., Vol. BME-33 (1986), p.153.

[4] W.H. Ko, K.M. Chang and G.J. Hwang: Sensors and Actuators A, Vol. 49 (1995), p.51.

[5] W.H. Ko, A.J. Maniglia and R.X. Zhang: Proc. IEEE-EMBS 9 th Ann. Conf., Boston, MA, USA, 1987, Section 404.

[6] L. Yuan, J. Pan, T. Yang and G. Han: Sensors and Actuators A, Vol. 36 (1993), p.177.

[7] C.P. Cockshott and S.J. Pacaud: Sensors and Actuators, Vol. 17 (1989), p.167.

[8] L. Yuan and A. Qiu: Sensors and Actuators A, Vol. 28 (1991), p.29.