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Title: High sensitivity optical fiber curvature sensor based on cascaded fiber interferometer
Authors: Dong, SD
Dong, B
Yu, CY 
Guo, YX
Keywords: Cascaded fiber interferometer
Fiber interferometer
Fiber sensor
Issue Date: 2018
Publisher: Institute of Electrical and Electronics Engineers
Source: Journal of lightwave technology, 15 Feb. 2018, v. 36, no. 4, p. 1125-1130 How to cite?
Journal: Journal of lightwave technology 
Abstract: A highly sensitive optical fiber curvature sensor based on cascaded fiber interferometers (CFIs) is demonstrated theoretically and experimentally. Theoretical results show that the scheme of cascaded fiber interferometers can be regarded as an equivalent fiber interferometer with longer interference length and narrower FSR. It serves as a curvature sensor with sensitivity up to 4.362 nm/m(-1) within the measurement range of 0-1.134 m(-1). Compared to the single fiber modal interferometer, the curvature sensitivity of the CFI is almost doubled. In addition, simultaneous curvature and temperature measurement is achieved using the coefficient matrix method, eliminating the issue of temperature cross sensitivity.
ISSN: 0733-8724
EISSN: 1558-2213
DOI: 10.1109/JLT.2017.2771507
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