Single-Wavelength Passive Phase-Shifted Demodulation Technique With the Dual-Cavity and EFA for the Interrogation of EFPI Diaphragm-Based Fiber Sensor

Autor:	Benli Yu, Cheng Zuo, Gang Zhang, Rui Wang, Shili Li, Guosheng Zhang, Dong Guang, Jinhui Shi, Qiang Ge, Xuqiang Wu
Rok vydání:	2022
Předmět:	Vibration Interferometry Wavelength Materials science Amplitude law Dynamic range Acoustics Direct current Demodulation Diaphragm (optics) Atomic and Molecular Physics and Optics law.invention
Zdroj:	Journal of Lightwave Technology. 40:222-227
ISSN:	1558-2213 0733-8724
DOI:	10.1109/jlt.2021.3069033
Popis:	A single-wavelength passive phase-shifted demodulation technique for the interrogation of a diaphragm-based fiber sensor is proposed. It is based on the configuration of the external FabryPerot interferometer (EFPI) with dual-cavity (DC) and the ellipse-fitting algorithm (EFA). The technique can address two main concerns: the orthogonality of the DC-EFPI must be matched, the direct current values and fringe visibility of the DCEFPI must be excluded or normalized. Experiment results show that the proposed technique demonstrates high accuracy amplitude measurement of reflective surface vibration with a high dynamic range over 135 dB and good effectiveness with various initial phase differences apart from two areas around 0 and rad. It is a successful solution for interrogating of diaphragm-based fiber sensors.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4c2ebf998a2138829f8d0fec82c3d62d https://doi.org/10.1109/jlt.2021.3069033 Zobrazit plný text záznamu