A Dual-Parameter Internally Calibrated Fabry-Perot Microcavity Sensor
Abstract
We propose and experimentally demonstrate multi-parameter sensors based on the antiresonant (AR) reflecting guidance in a single-mode fiber (SMF)-capillary-SMF structure. The sensor is manufactured by simply fusion splicing a certain length of hollow silica capillary between two commercial SMFs. Two prototypes with different lengths of the sandwiched capillary are fabricated and tested. The first sensor works in a reflection mode, based on the combined mechanisms of Fabry-Perot (FP) interference and AR reflecting guidance. As the length of the silica capillary exceeds the critical length for the transition of FP and AR, a typical amplitude modulation (AM) signal can be observed in the reflection spectrum of the device, including the AR envelope and the FP interference signal. Both the FP interference signal and the AR envelope can be used for sensing applications so that multi-parameter measurements can be realized. Measurements of temperature and strain were investigated in the demonstration experiment. The second sensor works in a transmission fashion. Multiple lossy dips exist at the sensor's transmission spectrum as the length of the sandwiched capillary increases due to the AR reflecting guidance in the capillary. The sensor was demonstrated for measuring bending and temperature. Due to macro-bending loss, the intensities of the lossy dips changed with bending; the wavelengths of the lossy dips shifted with temperature due to the temperature-induced changes in the resonance condition. The proposed SMF-capillary-SMF structure-based sensor and the multi-parameter codifying concept could find applications in the multi-parameter sensing field due to its compactness and simplicity.
Recommended Citation
C. Zhu et al., "A Dual-Parameter Internally Calibrated Fabry-Perot Microcavity Sensor," IEEE Sensors Journal, vol. 20, no. 5, pp. 2511 - 2517, Institute of Electrical and Electronics Engineers (IEEE), Mar 2020.
The definitive version is available at https://doi.org/10.1109/JSEN.2019.2954042
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Anti-Resonance; Dual-Parameter Sensing; Fabry-Perot Interference; Fiber Optics
International Standard Serial Number (ISSN)
1530-437X
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2020 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.
Publication Date
01 Mar 2020
Comments
This work was supported in part by the U.S. Army Research Laboratory, through the Leonard Wood Institute under Grant W911NF-07-2-0062 and Grant LWI-2018-006 and in part by the Acute Effects of Neurotrauma Consortium (AENC).