Low-pressure fiber-optic sensor by polyester Fabry-Perot cavity and its phase signal processing analysis

[Display omitted] •A versatile fiber optic-sensor for low-pressure detection. The sensor is based on the interaction between a polyester polymer film and a multimode fiber optic.•The optical-fiber sensor presents exponential response in the range from 0 to 2 psi, with sensitivity of 10.25 nm/psi.•Fl...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2020-11, Vol.315, p.112338, Article 112338
Main Authors: Gutierrez-Rivera, M., Jauregui-Vazquez, D., Sierra-Hernandez, J.M., Garcia-Mina, D.F., Lopez-Dieguez, Y., Estudillo-Ayala, J.M., Rojas-Laguna, R.
Format: Article
Language:English
Subjects:
Blue shift
Crosstalk
Fabry-Perot interferometers
Fiber optic sensor
Fiber optics
Finite element analysis
Finite element method
Frequency analysis
Low pressure
Membranes
Optical fibers
Polymers
Pressure detection
Sensors
Signal analysis
Signal processing
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Summary:[Display omitted] •A versatile fiber optic-sensor for low-pressure detection. The sensor is based on the interaction between a polyester polymer film and a multimode fiber optic.•The optical-fiber sensor presents exponential response in the range from 0 to 2 psi, with sensitivity of 10.25 nm/psi.•Flexible phase signal method to avoid cross-talk measurement and dismiss initial set point calibration; this method exhibits high sensitivity of 3.5 rad/psi. This manuscript presents the development of a low-pressure extrinsic Fabry-Perot fiber optic sensor based on a thin polyester film, using a phase signal analysis. The proposed interferometer is controlled by the simple contact interaction between the polymer membrane and a multimode fiber optic tip. The created cavity was uniformly stressed by applying a pressure varying from 0 to 2 psi. A finite element analysis was performed for these parameters. The stress applied to the membrane was below the yielding point. Thus, a linear study could be performed. The wavelength spectra exhibited a blue shift with a sensitivity of around 10.5 nm/psi. Although the interference spectra presented crosstalk measurements and required an initial set-point calibration, these effects were overcome by examining the spatial frequency components’ phase analysis. The sensors offered a high sensitivity, close to 3.5 rad/psi. Ultimately, this sensor is a high sensitivity and versatile alternative for low-pressure detection.
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2020.112338