Fiber optic displacement sensor for micro‐thickness measurement

Ahmad, Harith and Yasin, Moh and Thambiratnam, Kavintheran and Harun, Sulaiman Wadi (2012) Fiber optic displacement sensor for micro‐thickness measurement. Sensor Review, 32 (3). pp. 230-235. ISSN 0260-2288

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Official URL: https://doi.org/10.1108/02602281211233223

Abstract

Purpose-The purpose of this paper is to propose and demonstrate a simple yet accurate optical fibre based sensor capable of performing micron and sub-micron thickness measurement. Design/methodology/approach-The proposed sensor consists of a multimode plastic probe, three He-Ne lasers and translation stages along with a silicon photodiode and a lock-in amplifier to measure the output voltage as the displacement of the sensor is increased. Findings-The system operating with a source wavelength of 633 nm can provide measurements of up to 3mm with a sensitivity of 0.0054 mV/mm. Originality/value-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.

Item Type: Article
Uncontrolled Keywords: Electrical measurement; Fiber optic displacement sensor; Fiber optics; Fibre optic sensors; Micro-thickness measurement; Voltage
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: 07 Jan 2019 07:15
Last Modified: 07 Jan 2019 07:15
URI: http://eprints.um.edu.my/id/eprint/19925

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