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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 23 — Nov. 5, 2012
  • pp: 25421–25431

Quadrature demodulation with synchronous difference for interferometric fiber-optic gyroscopes

Zinan Wang, Yi Yang, Yongxiao Li, Xiaoqi Yu, Zhenrong Zhang, and Zhengbin Li  »View Author Affiliations


Optics Express, Vol. 20, Issue 23, pp. 25421-25431 (2012)
http://dx.doi.org/10.1364/OE.20.025421


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Abstract

We propose a novel method of quadrature demodulation with synchronous difference for suppressing noise in interferometric fiber-optic gyroscopes (IFOGs). For an IFOG with sine wave phase modulation, an in-phase result and a quadrature result are obtained simultaneously by coherent detection. Eigenfrequency modulation is used and a phase shift of 45° is set between the modulation signal and the reference signal, so that two results have the same expectation of amplitude but with opposite signs. A synchronous difference procedure is carried out for output, in which signals are added up and common noise between two results is eliminated. Theoretical analysis and experimental results show that both short term noise and long term instability of the IFOG are reduced by this method. In experimental comparison with the traditional demodulation method on the same IFOG with a 1982 m fiber coil, this method reduces the bias drift from 0.040°/h to 0.004°/h.

© 2012 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(060.2800) Fiber optics and optical communications : Gyroscopes

ToC Category:
Sensors

History
Original Manuscript: July 13, 2012
Revised Manuscript: September 14, 2012
Manuscript Accepted: October 9, 2012
Published: October 25, 2012

Citation
Zinan Wang, Yi Yang, Yongxiao Li, Xiaoqi Yu, Zhenrong Zhang, and Zhengbin Li, "Quadrature demodulation with synchronous difference for interferometric fiber-optic gyroscopes," Opt. Express 20, 25421-25431 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-23-25421


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