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Performance of optical displacement sensor using a pair type bundled fiber from a theoretical and experimental perspective

M. YASIN1,* , S. W. HARUN2, H. A. ABDUL-RASHID3, KUSMINARTO4, KARYONO4, A. H. ZAIDAN1, H. AHMADd5

Affiliation

  1. Department of Physics, Faculty of Mathematics and Natural Science, Airlangga University, Surabaya 60115, Indonesia
  2. Department of Electrical Engineering, Faculty of Engineering, University of Malaya 50603 Kuala Lumpur, Malaysia
  3. Faculty of Engineering, Multimedia University, 63100 Cyberjaya, Malaysia
  4. Department of Physics, Faculty of Mathematics and Natural Science, Gadjah Mada University, Yogyakarta, Indonesia
  5. dPhotonics Laboratory, Department of Physics, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract

An optical displacement sensor using a pair type bundled fiber is investigated from both the theoretical and experiment perspectives. The theoretical analysis uses an electromagnetic Gaussian beam approach to determine a transfer function of the sensor. The displacement between a flat mirror and the bundled fiber end is measured using an intensity modulation technique. The sensor has two operating ranges with a good linearity; namely the front slope and back slope. On the front slope the sensitivities are obtained at 1.71 and 1.0 mW/μm for the theoretical and experimental approaches respectively while on the back slope the sensitivities are 0.38 and 0.22 mW/μm for theoretical and experimental approaches respectively. This discrepancy in theoretical and experimental values is due to neglecting the effect of Gaussian beam truncation in our simple theoretical model. The front slope is highly sensitive and useful for close distance targets while the back slope is less sensitive and useful for large displacement movements.

Keywords

Fiber-optic displacement sensor, A pair bundled fiber, Paraxial Gaussian beams.

Citation

M. YASIN, S. W. HARUN, H. A. ABDUL-RASHID, KUSMINARTO, KARYONO, A. H. ZAIDAN, H. AHMADd, Performance of optical displacement sensor using a pair type bundled fiber from a theoretical and experimental perspective, Optoelectronics and Advanced Materials - Rapid Communications, 1, 11, November 2007, pp.549-553 (2007).

Submitted at: Oct. 3, 2007

Accepted at: Oct. 31, 2007