Optical Harmonic Vernier Effect: A New Tool for High Performance Interferometric Fiber Sensors

• Tipo: Artigo em Revista Científica Internacional
• Data: 2019

Autores

Gomes, AD (Autor) Outra; Ferreira, MS (Autor) Outra; Bierlich, J (Autor) Outra; Kobelke, J (Autor) Outra; Rothhardt, M (Autor) Outra; Bartelt, H (Autor) Outra; Frazao, O (Autor) FCUP

Revista

Título: Sensors

Vol. 30

Página Final: 5431

ISSN: 1424-3210

Editora: MDPI

Indexação

ISI Web of Knowledge - 1 Citação

Outras Informações

ID Authenticus: P-00R-HG4

DOI: 10.3390/s19245431

Abstract (EN): The optical Vernier effect magnifies the sensing capabilities of an interferometer, allowing for unprecedented sensitivities and resolutions to be achieved. Just like a caliper uses two different scales to achieve higher resolution measurements, the optical Vernier effect is based on the overlap in the responses of two interferometers with slightly detuned interference signals. Here, we present a novel approach in detail, which introduces optical harmonics to the Vernier effect through Fabry-Perot interferometers, where the two interferometers can have very different frequencies in the interferometric pattern. We demonstrate not only a considerable enhancement compared to current methods, but also better control of the sensitivity magnification factor, which scales up with the order of the harmonics, allowing us to surpass the limits of the conventional Vernier effect as used today. In addition, this novel concept opens also new ways of dimensioning the sensing structures, together with improved fabrication tolerances.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 18