Biaxial optical fiber sensor based in two multiplexed Bragg gratings for simultaneous shear stress and vertical pressure monitoring

C. Tavares; M. Domingues; A. Frizera-Neto; C. Leitão; N. Alberto; C. Marques; A. Radwan; E. Rocon; P. André; P. Antunes

doi:10.1117/12.2306889

9 May 2018 Biaxial optical fiber sensor based in two multiplexed Bragg gratings for simultaneous shear stress and vertical pressure monitoring

C. Tavares, M. Domingues, A. Frizera-Neto, C. Leitão, N. Alberto, C. Marques, A. Radwan, E. Rocon, P. André, P. Antunes

Author Affiliations +

Proceedings Volume 10680, Optical Sensing and Detection V; 106802R (2018) https://doi.org/10.1117/12.2306889
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

This work consists on the design and implementation of a compact and accurate biaxial optical fiber sensor (OFS) based on two in-line fiber Bragg gratings (FBGs) for the simultaneous measurement of shear and vertical forces. The two FBGs were inscribed in the same optical fiber and placed individually in two adjacent cavities. In the calibration and performance tests, the response from the optical fiber cells was compared with the values given by a three-axial electronic force sensor. Sensitivity values obtained for the FBG1 are K_1V= (14.15±0.10) pm/N (vertical force) and K_1S= (-26.02±0.08) pm/N (shear force) and for the FBG2 are K_2V= (7.35±0.02) pm/N and K_2S= (-24.29±0.08) pm/N. The conversion of the Bragg wavelength shift, given by the optical fiber sensors, into the shear and vertical force values is also presented along with its comparison to the values retrieved by an electronic sensor, yielding to low RMSE values, which shows the high accuracy of the algorithm applied. This work stands out from the others with optical fiber by the simplicity of its structure. The proposed solution represents a compact and reliable device for simultaneous measurement of shear and vertical forces, useful in several areas, such as: incorporation into insoles for plantar pressure and shear force measurement; electronic skin technologies; smart rehabilitation robotic exoskeletons; or even biomimetic prosthesis.

Citation Download Citation

C. Tavares, M. Domingues, A. Frizera-Neto, C. Leitão, N. Alberto, C. Marques, A. Radwan, E. Rocon, P. André, and P. Antunes "Biaxial optical fiber sensor based in two multiplexed Bragg gratings for simultaneous shear stress and vertical pressure monitoring", Proc. SPIE 10680, Optical Sensing and Detection V, 106802R (9 May 2018); https://doi.org/10.1117/12.2306889

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available