Resolution Improvement in Fabry-Perot Displacement Sensor Based on Fringe Counting Method

Nur Izzati Ismail, Nor Hafizah Ngajikin, Nor Fadzlina Mohd Zaman, Maisarah Awang, Asrul Izam Azmi, Nik Noordini Nik Abd. Malik, Norazan Mohd Kassim


This paper presents an improved Fringe Counting Method (FCM) technique in order to enhance the displacement resolution of a Fabry-Perot Displacement Sensor (FPDS). A simulation model of a FPDS based on the improved FCM has been developed and simulated for nanometer displacement range by using MATLAB mathematical software. Unlike conventional FCM that analyzed the number of fringes produced over one time period, the improved FCM analyzed the number of fringes for one largest Free Spectral Range (FSR). In this work, the initial length of Fabry-Perot Interferometer (FPI) cavity has been set at 75 μm due to limitation of the machining precision equipment. For the displacement analysis, the improved FCM technique is used as an algorithm. The research results prove that this FPDS could detect displacement at 10nm resolution over a working range of 40 nm. It showed that the improved FCM technique managed to enhance the capability of the conventional FCM in detecting nanometer displacement. 

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Chaurasiya H. Recent Trends of Measurement and Development of Vibration Sensors. International Journal of Computer Science Issues (IJCSI). 2012;9(4).

Santoso DR. A Simple Instrumentation System for Large Structure Vibration Monitoring. Indonesian Journal Of Elektrical Engineering. 2010;8(3):265-74.

Lee BH, Kim YH, Park KS, Eom JB, Kim MJ, Rho BS, et al. Interferometric fiber optic sensors. Sensors. 2012;12(3):2467-86.

Mhdi B, Ministry of S, Technology BI, Aljaber N, Ministry of S, Technology BI, et al. Design and construction of optical fiber sensor system for detection of stress and fine motion. International Journal of Nano Devices, Sensors and Systems (IJ-Nano). 2012;1(1):25-33.

García YR, Corres JM, Goicoechea J. Vibration detection using optical fiber sensors. Journal of Sensors. 2010;2010.

Chen J-H, Huang X-G, Zhao J-R, Tao J, He W-X, Liu S-H. Fabry–Perot interference-based fiber-optic sensor for small displacement measurement. Optics Communications. 2010;283(17):3315-9.

Zhou X, Yu Q. Wide-range displacement sensor based on fiber-optic Fabry–Perot interferometer for subnanometer measurement. Sensors Journal, IEEE. 2011;11(7):1602-6.

Seat H, Chawah P, Cattoen M, Sourice A, Plantier G, Boudin F, et al. Dual-modulation fiber Fabry-Perot interferometer with double reflection for slowly-varying displacements. Optics letters. 2012;37(14):2886-8.

Jia P, Wang D. Self-calibrated non-contact fibre-optic Fabry–Perot interferometric vibration displacement sensor system using laser emission frequency modulated phase generated carrier demodulation scheme. Measurement Science and Technology. 2012;23(11):115201.

Gangopadhyay TK, Henderson PJ. Vibration: history and measurement with an extrinsic Fabry–Perot sensor with solid-state laser interferometry. Applied optics. 1999;38(12):2471-7.

Gangopadhyay TK. Non-contact vibration measurement based on an extrinsic Fabry–Perot interferometer implemented using arrays of single-mode fibres. Measurement Science and Technology. 2004;15(5):911.

Sathitanon N, Pullteap S. A Fiber Optic Interferometric Sensor for Dynamic Measurement. International Journal of Computer Science & Engineering. 2008;2(2).

Seat HC, Pullteap S. An extrinsic fiber Fabry-Perot interferometer for dynamic displacement measurement. Mechatronics and Automation, 2007 ICMA 2007 International Conference; 2007: IEEE.

Pullteap S. Development of a Fiber based Interferometric Sensor for Non-contact Displacement Measurement. International conference on Computer, Electrical, and Systems Science, Paris (France); 2010.

Iizuka K. Elements of Photonics, In Free Space and Special Media: John Wiley & Sons; 2002.

Ngajikin NH, Kassim NM, Mohammad AB, Witjaksono G. Wide range of electrostatic actuation MEMS FPOTF. Progress In Electromagnetics Research C. 2009;9:155-69.

Ma C, Dong B, Gong J, Wang A. Decoding the spectra of low-finesse extrinsic optical fiber Fabry-Perot interferometers. Optics express. 2011;19(24):23727-42.



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