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

Yasin, Moh and Harun, Sulaiman Wadi and Ahmad, Harith (2011) Fiber optic displacement sensor based on micro-thickness measurement using bundled fiber and concave mirror. Journal of Optoelectronics and Advanced Materials, 13 (8). pp. 933-935. ISSN 1454-4164

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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.

Item Type: Article
Uncontrolled Keywords: Concave mirror; Fiber optic; Fiber optic displacement sensor; Micro-thickness measurement
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Faculty of Science > Dept of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 02 Jan 2019 02:16
Last Modified: 02 Jan 2019 02:16
URI: http://eprints.um.edu.my/id/eprint/19863

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