A microcavity extrinsic Fabry-Perot interferometric (EFPI) fiber-optic sensor is presented for measurement of strain. The EFPI sensor is fabricated by micromachining a cavity on the tip of a standard single-mode fiber with a femtosecond (fs) laser and is then self-enclosed by fusion splicing another piece of single-mode fiber. The fs-laser-based fabrication makes the sensor thermally stable to sustain temperatures as high as 800°C. The sensor exhibits linear performance for a range up to 3700 µε and a low temperature sensitivity of only 0.59 pm/°C through 800°C.
A. Kaur et al., "Microcavity Strain Sensor for High Temperature Applications," Optical Engineering, vol. 53, no. 1, SPIE, Jan 2014.
The definitive version is available at https://doi.org/10.1117/1.OE.53.1.017105
Electrical and Computer Engineering
National Science Foundation (U.S.)
Keywords and Phrases
Fabry-Perot; Femtosecond (fs) laser; Femtosecond-laser; Low temperature sensitivity; Optical fiber sensor; Standard single mode fibers; Strain analysis; Thermally stable; Composite micromechanics; Fabry-Perot interferometers; High temperature applications; Interferometry; Microcavities; Micromachining; Single mode fibers; Temperature; Sensors; Extrinsic Fabry-Perot interferometric
International Standard Serial Number (ISSN)
Article - Journal
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01 Jan 2014