An Optical Fiber Extrinsic Fabry-Perot Interferometer based Displacement Sensor with Centimeter Measurement Range
A low-cost and robust extrinsic Fabry-Perot interferometer (EFPI) based optical fiber displacement sensor with a wide measurement range, up to cm level, is reported in this paper. A gold-coated reflective mirror fixed inside the metal shell of the sensor, together with the endface of a single mode fiber form a Fabry-Perot cavity. The optical fiber is supported and oriented by a fiber ceramic ferrule, and the sensor is packaged and protected by a metal shell. A triangle geometry based displacement transfer mechanism is employed in the constructed sensor which makes the sensor capable of measuring wide-range displacement, and this triangle geometry based structure allows the measurement range of the sensor to be flexibly adjusted. When the measurement handgrip of the sensor experiences a displacement, the cavity length will change due to the triangle geometry design. By tracking the change in the reflection spectrum, the displacement can be determined. The experimental results show that a displacement measurement sensitivity of 42.68 nm/μm (change in EFPI cavity length/displacement magnitude) over a measurement range of 2.0 cm was achieved by the constructed prototype sensor. The present wide-range displacement sensor with low cost, high robustness has a great potential in the chemical-oil industry, the construction industry.
C. Zhu and J. Huang, "An Optical Fiber Extrinsic Fabry-Perot Interferometer based Displacement Sensor with Centimeter Measurement Range," Proceedings of SPIE, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2018, vol. 10598, SPIE, Mar 2018.
The definitive version is available at https://doi.org/10.1117/12.2295441
SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring (2018: Mar. 5-8, Denver, CO)
Electrical and Computer Engineering
Intelligent Systems Center
Keywords and Phrases
Construction industry; Fabry-Perot interferometers; Fiber optic sensors; Geometry; Gold coatings; Optical fibers; Single mode fibers; Displacement; Displacement sensor; Dynamic range; Extrinsic Fabry Perot interferometer; Fabry-Perot cavity; Optical fiber displacement; Reflection spectra; Transfer mechanisms; Displacement measurement; Cm dynamic range; Extrinsic Fabry-Perot interferometer
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01 Mar 2018