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Fiber optic displacement sensor for thickness measurement based on transmission and reflection of transparent plate

M. ABDULLAH1,* , N. BIDIN1, M. YASIN1,2, PUJIYANTO2, S.W. HARUN3, M. S. SHAHARIN1,*

Affiliation

  1. Advance Photonic Science Institute, Faculty of Science, UniversitiTeknologi Malaysia, 81310, Johor Bahru, Johor, Malaysia
  2. Department of Physics, Faculty of Science and Technology, Airlangga University, Surabaya 60115, Indonesia
  3. Photonics Research Centre, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract

A comparison in measuring thickness of transparent plate between transmission and reflection based fiber optic displacement sensor is reported. A series of standard glass slide each with thickness of 150 μm is utilized as specimens. The performance both of the sensor is characterized based on the estimation of the peak voltage, sensing displacement, and slope’s variation. The thickness sensor based beam through technique is found to be more pronounces in all aspects compared to reflection one. It is realized to be three times better in sensitivity. Even more prominently in slope variation whereby 65 times compare to front slope and 657 times to back slope. Inherently the transmission based also shown higher resolution. Hence transmission based FODS is more precision system for measuring the thickness of transparent plate in comparison to reflection. Directionality, lack of beam losses during insertion, no scattering, diffusions and absorption involve attribute to such high accuracy of beam through thickness sensor. Furthermore it is more reliable and user friendly sensor since its simplicity in setting, low cost and nondestructive testing and yet enables to provide precision measurement..

Keywords

Fiber optic, Fiber displacement sensor, Thickness measurement, Transmission, Reflection.

Submitted at: Oct. 18, 2013
Accepted at: May 15, 2014

Citation

M. ABDULLAH, N. BIDIN, M. YASIN, PUJIYANTO, S.W. HARUN, M. S. SHAHARIN, Fiber optic displacement sensor for thickness measurement based on transmission and reflection of transparent plate, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 5-6, pp. 665-671 (2014)