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Fiber optic displacement sensor based on micro-thickness measurement using bundled fiber and concave mirror

M. YASIN1,2, S.W. HARUN2,3, H. AHMAD2

Affiliation

  1. Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia
  2. Photonics Research Centre, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
  3. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.

Abstract

In this paper, we propose and demonstrate a simple yet accurate optical fiber based sensor capable of performing micron and sub-micron thickness measurement. The proposed sensor is based on reflective displacement sensor, which consists of a 785 nm light source, multimode plastic bundle fiber probe, a concave mirror target and a silicon detector. A mechanical chopper is used in conjunction with lock in amplifier to allow sensitive detection free from ambient light interference. The thickness of the sample can be obtained from a linear equation correlating the thickness of the sample to the displacement of the sensor at which the peak output voltage is obtained, or by correlating the thickness of the sample directly to the peak output voltage measured. The sensitivity of the sensor is obtained at 1.0188mV/mm in the range of 0-0.64 mm of cover slips thickness..

Keywords

Fiber optic, Fiber optic displacement sensor, Micro-thickness measurement, Concave mirror.

Submitted at: June 20, 2011
Accepted at: Aug. 10, 2011

Citation

M. YASIN, S.W. HARUN, H. AHMAD, Fiber optic displacement sensor based on micro-thickness measurement using bundled fiber and concave mirror, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 8, pp. 933-935 (2011)