期刊
IEEE SENSORS JOURNAL
卷 21, 期 23, 页码 26624-26630出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2021.3121489
关键词
Sensors; Demodulation; Interference; Real-time systems; Pressure measurement; Micromechanical devices; Crystals; Pressure measurement; real-time measurement; rapid demodulation; F-P MEMS sensor
资金
- National Natural Science Foundation of China [61735011, 61675152, 62075160, 62035006]
- Open Project of the Key Laboratory of Optoelectronics Information Technology [2021KFKT005, 2021KFKT006]
- Ministry of Education (Tianjin University), Tianjin, China
- Tianjin Talent Development Special Plan for High Level Innovation and Entrepreneurship Team
This paper proposes a novel method for real-time pressure measurement based on rapid phase demodulation of multi-cavities Fabry-Perot (F-P) sensor, which effectively reduces the influence of irrelevant cavities and is suitable for real-time demodulation of sensors with multiple cavities. Experimental results demonstrate the method's capability of real-time demodulation of MEMS sensors and measurement of pressure in the range of 110 kPa to 200 kPa, with a demodulation rate of 5 kHz.
In this paper, a novel method for real-time pressure measurement based on rapid phase demodulation of multi-cavities Fabry-Perot (F-P) sensor is proposed. In the demodulation system, according to the principle of low-coherence interference, birefringent crystals, polarizers and analyzers are used to obtain orthogonal signals, which can significantly reduce the influence of irrelevant F-P cavities on the demodulation result, indicating that the method is suitable for rapid demodulation of F-P sensors containing multiple cavities. Experimental results also confirm that the method is able to demodulate the signal of F-P MEMS sensor in real-time. By using the four-quadrant inverse tangent operation instead of differential cross multiplier algorithm to calculate the phase of the F-P sensor, pressure in the range of 110 kPa -200 kPa is measured in real-time, with the demodulation rate of 5 kHz. The measurement errors are less than 0.41 kPa, and the standard deviations are less than 0.25 kPa. The proposed method provides a new idea for the rapid demodulation of F-P sensors containing multiple cavities, and has great potential in promotion and applications of real-time pressure measurement, such as dynamic pressure of aero-engines, shock waves and so on.
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