Spectral sensor resolution measurement improvements by temporal analysis

ANTONACCI, JULIAN; MOREL, ENEAS N.; TORGA, JORGE; DUCHOWICZ, RICARDO; ARENAS, GUSTAVO F.

2017 17th Workshop on Information Processing and Control, RPIC 2017

Institute of Electrical and Electronics Engineers Inc.

Año: 2017 vol. 2017 p. 1 - 5

In this work we present time domain interferometry (TDI) and spectral domain interferometry (SDI) techniques applied to a fiber optic Fizeau interferometer sensor. This class of sensor is capable of measuring parameters such as position, length and vibrations, in the spectral domain with improved resolution by a temporal analysis. In particular, Fourier domain SDI (FD-SDI), is able of measuring absolute cavity lengths with a resolution of 10 μm typically, depending on the bandwidth of the optic source and the spectrometer. Alternatively, TDI allows making displacement measurements within a resolution of λ/10, depending on the laser light wavelength (λ) used.