期刊
SENSORS
卷 18, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/s18041011
关键词
fiber-optic; Fabry-Perot; FBG; gas pressure sensor; high temperature
资金
- National Science Fund for Distinguished Young Scholars [51425505]
- National Natural Science Foundation of China [51405454]
- Fund for Shanxi 1331 Project Key Subject Construction
A diaphragm-free fiber-optic Fabry-Perot (FP) interferometric gas pressure sensor is designed and experimentally verified in this paper. The FP cavity was fabricated by inserting a well-cut fiber Bragg grating (FBG) and hollow silica tube (HST) from both sides into a silica casing. The FP cavity length between the ends of the SMF and HST changes with the gas density. Using temperature decoupling method to improve the accuracy of the pressure sensor in high temperature environments. An experimental system for measuring the pressure under different temperatures was established to verify the performance of the sensor. The pressure sensitivity of the FP gas pressure sensor is 4.28 nm/MPa with a high linear pressure response over the range of 0.1-0.7 MPa, and the temperature sensitivity is 14.8 pm/degrees C under the range of 20-800 degrees C. The sensor has less than 1.5% non-linearity at different temperatures by using temperature decoupling method. The simple fabrication and low-cost will help sensor to maintain the excellent features required by pressure measurement in high temperature applications.
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