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Theoretical and experimental study of fiber-optic displacement sensor using multimode fiber coupler

SAMIAN1,* , Y. H. PRAMONO2, A. Y. ROHEDI2, F. RUSYDI1, A. H. ZAIDAN1

Affiliation

  1. Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia
  2. Department of Physics, Faculty of Mathematics and Natural Sciences , Sepuluh Nopember Institute of Technology Surabaya 60115, Indonesia

Abstract

This paper studies the displacement sensor using multimode fiber coupler based on intensity modulation. Fiber coupler used is handmade from plastic optical fiber 1 mm diameter; it has coupling ratio 0.25, excess loss 1.37 dB, and directivity 25 dB. He-Ne laser (632.8 nm) and OPT 101 (Burr Brown) detector is used to detect the change in power-output due to object displacement. The correlation function between power-output and object displacement is analyzed theoretically by Gaussian electromagnetic beam approximation and characterize the dynamic range sensor 4 mm (with linear region 1 mm) and sensitivity is 55.4 55.5 μW/mm. The experiment shows that the sensor is able to detect object displacement (in front of silvered mirror) accurately in order of 5 μm.

Keywords

Fiber coupler, Multimode fiber optic, Displacement sensor.

Citation

SAMIAN, Y. H. PRAMONO, A. Y. ROHEDI, F. RUSYDI, A. H. ZAIDAN, Theoretical and experimental study of fiber-optic displacement sensor using multimode fiber coupler, Optoelectronics and Advanced Materials - Rapid Communications, 3, 5, May 2009, pp.411-414 (2009).

Submitted at: April 6, 2009

Accepted at: May 25, 2009