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Open AccessArticle

Novel Method of Detecting Movement of the Interference Fringes Using One-Dimensional PSD

by Qi Wang 1,2,*,†, Ji Xia 3,†, Xu Liu 1 and Yong Zhao 1,2
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China
Academy of Ocean Science and Engineering, National University of Defense Technology, College of Optoelectronic Science and Engineering, Changsha 410073, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Vittorio M.N. Passaro
Sensors 2015, 15(6), 12857-12871;
Received: 23 March 2015 / Revised: 26 May 2015 / Accepted: 27 May 2015 / Published: 2 June 2015
(This article belongs to the Section Physical Sensors)
In this paper, a method of using a one-dimensional position-sensitive detector (PSD) by replacing charge-coupled device (CCD) to measure the movement of the interference fringes is presented first, and its feasibility is demonstrated through an experimental setup based on the principle of centroid detection. Firstly, the centroid position of the interference fringes in a fiber Mach-Zehnder (M-Z) interferometer is solved in theory, showing it has a higher resolution and sensitivity. According to the physical characteristics and principles of PSD, a simulation of the interference fringe’s phase difference in fiber M-Z interferometers and PSD output is carried out. Comparing the simulation results with the relationship between phase differences and centroid positions in fiber M-Z interferometers, the conclusion that the output of interference fringes by PSD is still the centroid position is obtained. Based on massive measurements, the best resolution of the system is achieved with 5.15, 625 μm. Finally, the detection system is evaluated through setup error analysis and an ultra-narrow-band filter structure. The filter structure is configured with a one-dimensional photonic crystal containing positive and negative refraction material, which can eliminate background light in the PSD detection experiment. This detection system has a simple structure, good stability, high precision and easily performs remote measurements, which makes it potentially useful in material small deformation tests, refractivity measurements of optical media and optical wave front detection. View Full-Text
Keywords: fiber M-Z interferometer; centroid detection; movement measurement; PSD fiber M-Z interferometer; centroid detection; movement measurement; PSD
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Wang, Q.; Xia, J.; Liu, X.; Zhao, Y. Novel Method of Detecting Movement of the Interference Fringes Using One-Dimensional PSD. Sensors 2015, 15, 12857-12871.

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