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Sensors 2012, 12(1), 481-488;

Measurement of Organic Chemical Refractive Indexes Using an Optical Time-Domain Reflectometer

Information and Communications Research Laboratories (ICL), Industrial Technology Research Institute (ITRI), Hsinchu 31040, Taiwan
Department of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan
Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan
Author to whom correspondence should be addressed.
Received: 2 December 2011 / Revised: 28 December 2011 / Accepted: 4 January 2012 / Published: 5 January 2012
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [303 KB, uploaded 21 June 2014]


In this investigation, we propose and experimentally demonstrate a method for measuring the refractive index (RI) of liquid organic chemicals. The scheme is based on a single-mode fiber (SMF) sensor and an optical time-domain reflectometer (OTDR). Here, due to the different reflectance (R) between the SMF and organic liquid chemicals, the reflected power level of the backscattering light (BSL) measured by the OTDR would be different. Therefore, we can measure the RI of chemical under test via the measured BSL level. The proposed RI sensor is simple and easy to manipulate, with stable detected signals, and has the potential to be a valuable tool for use in biological and chemical applications. View Full-Text
Keywords: fiber sensor; OTDR; refractive index (RI) fiber sensor; OTDR; refractive index (RI)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Yeh, C.-H.; Chow, C.-W.; Sung, J.-Y.; Wu, P.-C.; Whang, W.-T.; Tseng, F.-G. Measurement of Organic Chemical Refractive Indexes Using an Optical Time-Domain Reflectometer. Sensors 2012, 12, 481-488.

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