Journal
IEEE SENSORS JOURNAL
Volume 21, Issue 22, Pages 25749-25757Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3118360
Keywords
Sensors; Vibrations; Strain; Fiber gratings; Temperature sensors; Mechanical sensors; Optical fiber sensors; Sensor; three-axis vibration sensor; fiber Bragg grating
Funding
- National Natural Science Foundation of China [52075397]
- National Major Scientific Instruments Development Project of China [51827812]
- Science and Technology Development Fund, Macau, Special Administrative Region (SAR) [0025/2020/ASC]
- Projects in Key Areas of Guangdong Province [2019B111106001]
- National Key Research and Development Program of China [2019YFB1600700]
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This paper proposed a three-axis vibration sensor based on fiber Bragg grating (FBG) with only five sensing elements, using a composite structure of cross-beam-type elastomer with multiplexed FBGs for sensing. The sensor showed low cross coupling and self temperature compensation capability. Through finite element analysis, the strain distribution and dynamic characteristics of the composite structure were studied, and vibration sensitivity tests validated its capability to measure three-axis vibration.
This paper proposed a fiber Bragg grating (FBG)-based three-axis vibration sensor by using only five sensing elements. A composite structure of the cross-beam-type elastomer with multiplexed FBGs has been designed for three-axis vibration sensing. Because of the mechanical decoupling function of the structure and the reasonable arrangement of FBG sensing elements, the designed sensor possesses great advantages of low cross coupling and self temperature compensation capability. Theoretical model of the composite structure has been established, strain distribution and dynamic characteristics of the composite structure have been studied by the finite element analysis method. Amplitude-frequency test result shows that resonant frequencies of the sensor in X, Y, and Z directions were 980Hz, 960Hz, and 640Hz, respectively. Vibration sensitivities in X, Y, and Z directions were 9.7pm/g, 10.13pm/g, and 7.45pm/g, respectively. Vibration calibration test have validated that the designed sensor possess the capability to measure three-axis vibration.
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