Research on frequency-modulated continuous-wave laser interference fiber optic pressure sensor

Lang Bai; Jesse Zheng; Xiongxing Zhang; Bin Sun

doi:10.1117/12.2577082

5 November 2020 Research on frequency-modulated continuous-wave laser interference fiber optic pressure sensor

Lang Bai, Jesse Zheng, Xiongxing Zhang, Bin Sun

Proceedings Volume 11567, AOPC 2020: Optical Sensing and Imaging Technology; 115671A (2020) https://doi.org/10.1117/12.2577082
Event: Applied Optics and Photonics China (AOPC 2020), 2020, Beijing, China

Abstract

In this work, a new type of optical fiber pressure sensor based on Frequency Modulated Continuous Wave (FMCW) laser interference technology was designed and produced. The sensor consists of a diaphragm-type Fabry-Perot (F-P) cavity structure, which is made of 316L stainless steel with excellent elastic properties. The deformation of the diaphragm occurs under the gas pressure, which causes the length of the F-P cavity to change. The FMCW laser interference technique was employed to demodulate the change of cavity length. The experimental results show that the linearity of pressure and cavity length can reach 0.99993 whin the range of 0~600 kPa, and also verify that the pressure sensor has good repeatability and stability.

Citation Download Citation

Lang Bai, Jesse Zheng, Xiongxing Zhang, and Bin Sun "Research on frequency-modulated continuous-wave laser interference fiber optic pressure sensor", Proc. SPIE 11567, AOPC 2020: Optical Sensing and Imaging Technology, 115671A (5 November 2020); https://doi.org/10.1117/12.2577082

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KEYWORDS

Sensors

Fiber optics sensors

Frequency modulation

Fiber optics

Signal detection

Continuous wave operation

Phase shift keying

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