High-speed, large dynamic range spectral domain interrogation of fiber-optic Fabry-Perot interferometric sensors

Kit Pan Wong, Hyun Tae Kim, Keshav Rajasekaran, Amirhossein Yazdkhasti, Bala Sai Sudhakar, An Wang, Samuel E. Lee, Kenneth Kiger, James H. Duncan, Miao Yu

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We report high-speed, large dynamic range spectral domain interrogation of fiber-optic Fabry-Perot (FP) interferometric sensors. An optical interrogation system employing a piezoelectric FP tunable filter and an array of fiber-Bragg gratings for wavelength referencing is developed to acquire the reflection spectrum of FP sensors at a high interrogation speed with a wide wavelength range. A 98 nm wavelength interrogation range was obtained at the resonance frequency of ∼110 kHz of the FP tunable filter. At this frequency, the resolution of the FP cavity length measurement was 1.8 nm. To examine the performance of the proposed high-speed spectral domain interrogation scheme, two diaphragm-based fiber-tip FP sensors (a pressure sensor and acoustic sensor)were interrogated. The pressure measurement results show that the high-speed spectral domain interrogation method has the advantages of being robust to light intensity fluctuations and having a much larger dynamic range compared with the conventional intensity-based interrogation method. Moreover, owing to its capability of measuring the absolute FP cavity length, the proposed interrogation system mitigates the sensitivity drift that intensity-based interrogation often suffers from. The acoustic measurement results demonstrate that the high-speed spectral domain interrogation method is capable of high-frequency acoustic measurements of up to 20 kHz. This work will benefit many applications that require high-speed interrogation of fiber-optic FP interferometric sensors.

Original languageEnglish
Pages (from-to)4670-4677
Number of pages8
JournalApplied Optics
Volume61
Issue number16
DOIs
StatePublished - 1 Jun 2022

Fingerprint

Dive into the research topics of 'High-speed, large dynamic range spectral domain interrogation of fiber-optic Fabry-Perot interferometric sensors'. Together they form a unique fingerprint.

Cite this