Giant Displacement Sensitivity Using Push-Pull Method in Interferometry

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Paulo Robalinho (Author) Other; Orlando Frazão (Author) FEUP

Journal

Title: Photonics

Vol. 8 No. 1

Pages: 1-8

Publisher: MDPI

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00T-ASJ

DOI: 10.3390/photonics8010023

Abstract (EN): We present a giant sensitivity displacement sensor combining the push-pull method and enhanced Vernier effect. The displacement sensor consists in two interferometers that are composed by two cleaved standard optical fibers coupled by a 3 dB coupler and combined with a double-sided mirror. The push pull-method is applied to the mirror creating a symmetrical change to the length of each interferometer. Furthermore, we demonstrate that the Vernier effect has a maximum sensitivity of two-fold that obtained with a single interferometer. The combination of the push-pull method and the Vernier effect in the displacement sensors allows a sensitivity of 60 +/- 1 nm/mu m when compared with a single interferometer working in the same free spectral range. In addition, exploring the maximum performance of the displacement sensors, a sensitivity of 254 +/- 6 nm/mu m is achieved, presenting a M-factor of 1071 and M-Vernier of 1.9 corresponding to a resolution of 79 pm. This new solution allows the implementation of giant-sensitive displacement measurement for a wide range of applications.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8