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Enhanced resolution fiber optic strain sensor based on Mach-Zehnder interferometer and displacement sensing principles

Sadeghi Jahed, N. M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1109/ELECO.2009.5355231
  3. Abstract:
  4. In this study, a novel scheme for fiber optic strain sensor has been introduced. This scheme is indeed a Mach-Zehnder interferometer followed by a displacement sensor. The strain is applied to an optical fiber which is the main branch of the Mach-Zehnder interferometer and causes an alteration in the interferometer's output intensity. The output beam is then spread on a mirror located in front of the fiber head. The head of the fiber and the mirror form a displacement sensor configuration. The portion of the reflected beam, gathered by the fiber, is a function of the distance between the fiber head and the mirror. So, applying strain causes a new change in the gathered intensity due to the elongation of the fiber. The combination of the several effects in altering the detected power by variation in the applied strain makes the proposed sensor more sensitive
  5. Keywords:
  6. Applied strain ; Displacement sensor ; Fiber head ; Fiber optic strain sensor ; Output beam ; Output intensity ; Reflected beam ; Composite bridges ; Electronics engineering ; Interferometry ; Mach-Zehnder interferometers ; Mirrors ; Optical fibers ; Optical instruments ; Optical materials ; Sensors ; Fibers
  7. Source: ELECO 2009 - 6th International Conference on Electrical and Electronics Engineering, 5 November 2009 through 8 November 2009 ; 2009 , Pages II302-II306 ; 9789944898188 (ISBN)
  8. URL: http://ieeexplore.ieee.org/document/5355231