Novel Method of Detecting Movement of the Interference Fringes Using One-Dimensional PSDReport as inadecuate




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1

College of Information Science and Engineering, Northeastern University, Shenyang 110819, China

2

State Key Laboratory of Synthetical Automation for Process Industries, Northeastern University, Shenyang 110819, China

3

Academy of Ocean Science and Engineering, National University of Defense Technology, College of Optoelectronic Science and Engineering, Changsha 410073, China



These authors contributed equally to this work.





*

Author to whom correspondence should be addressed.



Academic Editor: Vittorio M.N. Passaro

Abstract 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





Author: Qi Wang 1,2,†,* , Ji Xia 3,†, Xu Liu 1 and Yong Zhao 1,2

Source: http://mdpi.com/



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