10 November 2003 Integrated fiber optic displacement sensor based on multimode interference
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An integrated fiber-optic displacement sensor based on multimode interference is characterized through analysis of experimental performance in comparison to the expected behavior that is theoretically predicted. Multimode interference and re-imaging theory applied to the specific fiber properties and geometry of the device can be used to design and predict the performance of the device. Essentially, the sensor consists of a multimode fiber of a specific length fusion spliced to a single mode fiber used in conjuction with an 80/20 splitter, source, and detector that are used to inject and detect reflected signals from targets. The sensor is fabricated into a robust, compact, and single arm device capable of operating as a calibrated displacement sensor over a large displacement range. This is achieved through analysis of power reflected off of a surface and back through the device over a finite wavelength range.
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Alok A. Mehta, Alok A. Mehta, Waleed Mohammed, Waleed Mohammed, Eric G. Johnson, Eric G. Johnson, } "Integrated fiber optic displacement sensor based on multimode interference", Proc. SPIE 5177, Gradient Index, Miniature, and Diffractive Optical Systems III, (10 November 2003); doi: 10.1117/12.511124; https://doi.org/10.1117/12.511124

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