Study On Optical Communications, Volume. 46, Issue 4, 54(2020)
Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity
To balance the trade-off between the measurement sensitivity and range of the Fiber Bragg Grating (FBG) ultrasonic detection sensor, a demodulation scheme based on Fabry Perot (FP) cavity and π-phase-shifted FBG (π-FBG) is proposed. The principle of demodulation based on FP cavity is analyzed and numerically simulated in detail. A group of demodulators consisting of two longitudinal modes of the FP cavity can double the system sensitivity, and has good linearity. A demodulator array can be constructed when expanding to multiple modes, which can greatly increase the system range, and effectively balance the trade-off between measurement sensitivity and range. Numerical simulation results show that this scheme is feasible under the practical parameters, and has the merits of high sensitivity and fast response speed.
Get Citation
Copy Citation Text
GAO Zai-qing, ZHANG Shi-cheng, NIU Yue-ping, GONG Shang-qing. Research on Large Range Ultrasonic Detection Demodulation System based on FP Cavity[J]. Study On Optical Communications, 2020, 46(4): 54
Category:
Received: Jan. 17, 2020
Accepted: --
Published Online: Nov. 2, 2020
The Author Email: Shi-cheng ZHANG (sczhang@ecust.edu.cn)