期刊
IEEE SENSORS JOURNAL
卷 22, 期 24, 页码 23931-23936出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2022.3218677
关键词
Accelerometer; Fabry-Perot interferometer (FPI); fiber Bragg gratings (FBGs); point-by-point inscription
资金
- National Natural Science Foundation of China [61735014, 61927812]
This study proposes and designs an in-fiber Fabry-Perot interferometer for performance improvement of a fiber Bragg grating accelerometer, achieving higher sensitivity and lower detection threshold by improving the optical properties of the accelerometer.
An in-fiber Fabry-Perot interferometer (FPI) is proposed and designed for performance improvement of a fiber Bragg grating (FBG) accelerometer. It consists of two FBGs which are inscribed using the femtosecond laser point-by-point technology. The spectral characteristics of the FBG Fabry-Perot (FBG-FP) were studied. Edge filter interrogation configuration was employed in the vibration measurement system. In contrast to the conventional FBG accelerometer used in wavelength interrogation or edge filter interrogation configurations, the scheme has a higher sensitivity and lower detection threshold which are achieved improving the optical properties of the accelerometer. We fabricated a high-frequency accelerometer and experiments were carried out to verify its performance. The sensitivity and detection threshold were 27.3 mV/g and 1.5 mg, respectively. This study presents a feasibility analysis of the short cavity FBG-FP, as opposed to a single FBG, for the vibration accelerometer.
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