On-Line Displacement Measurement System Based on Multiplexed Optical Fiber Mach-Zenhder Heterodyne Interferometry

WANG Yunzhi1 XIE Fang1 CHEN Longhui1 XU Haibo1 LI Mingjia1

(1.Laboratory of Opto-Electronic Information Science and Engineering, Department of Physics, School of Science, Beijing Jiaotong University, Beijing, China 100044)

【Abstract】A multiplexed optical fiber Mach-Zenhder heterodyne interferometric system which is suitable for on-line displacement measurement is researched. Based on the characteristic that fiber Bragg grating only reflects Bragg wavelength, two independent optical fiber Mach-Zenhder interferometers which possess almost the same optical path are established. One of the optical fiber Mach-Zenhder interferometers is used to perform the measurement task, while the other one is used to monitor the environmental disturbances. The system is suitable for on-line measurement after the environmental disturbances are compensated. The acoustic optical modulators embedded in the reference arm of the interferometers shift the frequency of the reference beam, and heterodyne interferometric signals are formed when the reference beam meets the measurement beam, realizing heterodyne interferometric measurement. During the experiments, the standard deviation of 10 repeated measurements for 100 μm displacement is 6 nm.

【Keywords】 measurement; optical fiber sensing; on-line measurement; heterodyne interferometric measurement; displacement measurement;


【Funds】 Natural Science Foundation of Beijing (3172024)

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(Translated by CAI ZJ)


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This Article


CN: 31-1339/TN

Vol 46, No. 09, Pages 194-198

September 2019


Article Outline


  • 1 Introduction
  • 2 Principle of on-line displacement measurement system based on multiplexed optical fiber Mach-Zehnder heterodyne interferometry
  • 3 Displacement measurement and discussion
  • 4 Conclusions
  • References