Phase sensitive diffraction sensor for high sensitivity refractive index measurement

2018 ◽  
Author(s):  
Nityanand Kumawat ◽  
Manoj Varma ◽  
Sunil Kumar
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Refractive Index Measurement ◽  
Index Measurement ◽  
Phase Sensitive

In-fiber Mach-Zehnder Interferometer Based on Cascading Fiber Air Bubble for High Sensitivity Liquid Refractive Index Measurement

2016 ◽  
Vol 45 (7) ◽  
pp. 70706006
Author(s):  
李辉栋 LI Hui-dong ◽  
傅海威 FU Hai-wei ◽  
邵敏 SHAO Min ◽  
闫旭 YAN Xu ◽  
贾振安 JIA Zhen-an
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Zehnder Interferometer ◽  
Refractive Index Measurement ◽  
Air Bubble ◽  
Index Measurement ◽  
Mach Zehnder Interferometer

scholarly journals High-Sensitivity, Large Dynamic Range Refractive Index Measurement Using an Optical Microfiber Coupler

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5078 ◽  
Author(s):  
Wang ◽  
Li ◽  
Fu ◽  
Li
Keyword(s):  
Refractive Index ◽  
Turning Point ◽  
Dynamic Range ◽  
Free Spectral Range ◽  
High Sensitivity ◽  
Fringe Order ◽  
Refractive Index Measurement ◽  
Index Measurement ◽  
Optical Microfiber ◽  
Index Unit

Wavelength tracking methods are widely employed in fiber-optic interferometers, but they suffer from the problem of fringe order ambiguity, which limits the dynamic range within half of the free spectral range. Here, we propose a new sensing strategy utilizing the unique property of the dispersion turning point in an optical microfiber coupler mode interferometer. Numerical calculations show that the position of the dispersion turning point is sensitive to the ambient refractive index, and its position can be approximated by the dual peaks/dips that lay symmetrically on both sides. In this study, we demonstrate the potential of this sensing strategy, achieving high sensitivities of larger than 5327.3 nm/RIU (refractive index unit) in the whole refractive index (RI) range of 1.333–1.4186. This sensor also shows good performance in narrow RI ranges with high resolution and high linearity. The resolution can be improved by increasing the length of the coupler.

Modal Interferometer Based on a C-Shaped Ultrathin Fiber Taper for High-Sensitivity Refractive Index Measurement

2011 ◽  
Vol 5 (1) ◽  
pp. 012502 ◽  
Author(s):  
Haimei Luo ◽  
Xinwan Li ◽  
Weiwen Zou ◽  
Wenning Jiang ◽  
Jianping Chen
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Refractive Index Measurement ◽  
Index Measurement ◽  
Fiber Taper

Temperature-Insensitive Miniaturized Fiber Inline Fabry-Perot Interferometer Fabricated by Femtosecond Laser

2008 ◽  
Author(s):  
Yukun Han ◽  
Cheng-Hsiang Lin ◽  
Hai-Lung Tsai ◽  
Tao Wei ◽  
Hai Xiao
Keyword(s):  
Refractive Index ◽  
Refractive Index Change ◽  
High Sensitivity ◽  
Temperature Dependent ◽  
Refractive Index Measurement ◽  
Index Measurement ◽  
Highly Sensitive ◽  
Fabry Perot ◽  
Fs Laser ◽  
One Step

This article presents a miniaturized fiber inline Fabry-Perot interferometer (FPI), with an open micro-notch cavity fabricated by one-step femtosecond (fs) laser micromachining, for highly sensitive refractive index measurement. The device was tested for measurement of the refractive indices of various liquids including isopropanol, acetone and methanol at room temperature, as well as the temperature-dependent refractive index of deionized water from 3 to 90°C. The sensitivity for measurement of refractive index change of water was 1163 nm/RIU at the wavelength of 1550 nm. The temperature cross-sensitivity of the device was about 1.1×10−6 RIU/°C. The small size, all-fiber structure, small temperature dependence, linear response and high sensitivity, make the device attractive for chemical and biological sensing.

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