Earticle

초록

영어

A fiber-optic sensor is a sensor with high sensitivity, and signal detection technology is one of its key technologies. Phase generated carrier demodulation technology is a homodyne demodulation method widely used for interference fiber-optic sensors. Research reveals that the amplitude of the interference signal and the modulation depth will affect the result of demodulation. The distortion of the demodulated signal can be reduced by the elimination of the effects of the interference signal amplitude and modulation depth. A phase generated carrier demodulation method for interference fiber-optic sensors is proposed to detect weak ELF signals. Theoretical analysis and simulation have been implemented on the demodulation of weak ELF signals using low-level sub-mixer carrier. The results indicate that in the demodulation of weak ELF signals, DC drift occurs in the DCM approach, while the Arctangent approach does not have this problem. Then, an optical fiber sensing system for ELF signals is established based on optical fiber interferometer, indicating the Arctangent approach is able to demodulate the VLF signals accurately.

목차

Abstract
 1. Introduction
 2. The Phenomena of Phase Induced Signal Fade
  2.1 Physical Mechanisms
  2.2 Detection Methods Resisting Phase Induced Signal Fade
 3. The Application of Phase Generated Carrier Demodulation Technique
  3.1 Principle of Phase Generated Carrier Modulation and Demodulation
  3.2 Simulation of Low Frequency Signals
  3.3 The Effect of Filter Phase Delay on Demodulation Results
 4. Conclusions
 References

키워드

저자

• Wang Yong-jiao [ National Engineering Laboratory for Fiber Optical Sensing Technology Wuhan University of Technology, Wuhan, 430070, China, School of Computer Science, University of Uuban Construction, Pingdingshan, 467036, China ]
• Wang Chuan [ College of Computer and Information Engineering, Henan Normal University, Xinxiang, 453007, China ]
• Yuan Yin-quan [ National Engineering Laboratory for Fiber Optical Sensing Technology Wuhan University of Technology, Wuhan, 430070, China ]
• Liang Lei [ National Engineering Laboratory for Fiber Optical Sensing Technology Wuhan University of Technology, Wuhan, 430070, China ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Signal Processing, Image Processing and Pattern Recognition

• 간기

  격월간

• pISSN

  2005-4254

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605