Non-contact refractive index measurement based on fiber optic beam-through technique

Rahman, Husna Abdul and Harun, Sulaiman Wadi and Yasin, Moh and Ahmad, Harith (2011) Non-contact refractive index measurement based on fiber optic beam-through technique. Optoelectronics and Advanced Materials-Rapid Communications, 5 (10). pp. 1035-1038. ISSN 1842-6573,

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A simple refractive index sensor for various concentrations of sodium chloride (NaCl) in de-ionized water is proposed and demonstrated. The beam-through technique is used to obtain output voltage of liquids with known refractive indices, namely methanol, de-ionized water, acetone and ethanol. Based on the output voltage of these liquids, the sensor characteristic curve is determined and the refractive indices of 2 % to 12 % sodium chloride concentrations are obtained. A sensitivity and detection limit of 23.07 mV/refractive index unit (RIU) and 2.28 × 10-3 RIU have been derived from measurements, respectively, with a linearity of more than 97 %. The fiber optic sensor is a promising alternative to other well-established methods for the measurement of liquid refractive index due to its simplicity of design, linearity, non-contact sensing, ruggedness and low fabrication cost.

Item Type: Article
Uncontrolled Keywords: Beam-through technique; Fiber optic; Fiber optic displacement sensor; Refractive index measurement; Sodium chloride in de-ionized water
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 02 Jan 2019 04:19
Last Modified: 02 Jan 2019 04:19

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