High-speed, large dynamic range spectral domain interrogation of fiber-optic Fabry–Perot interferometric sensors
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 k H z 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 23, 2022
- Source ID
- 10.1364/ao.458196
Entities
People
- Amirhossein Yazdkhasti
- An Wang
- Bala Sai Sudhakar
- Hyun-Tae Kim
- James H Duncan
- Ken Kiger
- Keshav Rajasekaran
- Kit Pan Wong
- Miao Yu
- Samuel E. Lee
Organizations
- Office of Naval Research
- University of Maryland