Micro-force measurement with pre-curvature long-period fiber grating-based sensor

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Ferreira, WSJ (Author) Other; dos Santos, PSS (Author) Other; Caldas, P (Author) Other; Jorge, PAS (Author) FCUP; Sakamoto, JMS (Author) Other

Journal

Title: EPJ Web of Conferences

ISSN: 2101-6275

Publisher: EDP Sciences

Other information

Authenticus ID: P-00S-T9E

DOI: 10.1051/epjconf/202023812009

Abstract (EN): <jats:p>In this work, a long-period fiber grating (LPG) based sensor was evaluated as a sensing device for micro-force measurement, in the order of micro Newtons. It was used an LPG fabricated by arc-inducted technique in a SMF-28 standard optical fiber. The optical fiber was fixed between two clamps with a separation of 150 mm with the middle of the LPG located at the center. Characterizations were performed in terms of temperature, curvature and strain. The grating was then used as a micro-force sensor by means of both curvature and strain, induced by a hung mass in a stretched fiber. Furthermore, the evaluation of a precurvature LPG was performed to assess if an increase of sensitivity is achieved. Micro-force sensitivity achieved with the stretched LPG was 1.41 nm/mN and it was demonstrated that its sensitivity can be enhanced to 5.14 nm/mN with a pre-curvature of 2.2 m<jats:sup>¿1</jats:sup> applied to the LPG, achieving a spectral resolution of at least 15.6 ¿N.</jats:p>

Language: English

Type (Professor's evaluation): Scientific