Share Email Print
cover

Proceedings Paper • new

An ameliorated phase-generated-carrier demodulation algorithm for sinusoidal phase-modulating fiber-optic interferometer
Author(s): Shuwang Li; Guoguang Lu; Canxiong Lai; Yunfei En
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

The phase-generated-carrier (PGC) algorithm is the most widely used signal demodulation method for fiber-optic interferometer sensors (FOIS), due to its distinct advantages of high resolution, wide dynamic range, good linearity and multi-channels demodulation capability. Even though significant progress has been made in PGC algorithm, the influence of phase modulation amplitude variation for PGC-differential-cross-multiplying approach (PGC-DCM) and PGC-Arctangent approach (PGC-Arc) still remains, especially on large-scale FOIS array. In this paper, a novel ameliorated digital PGC algorithm based on three-channel mixing signals has been present to mitigate this effect, which called PGC-differential-cross-dividing approach (PGC-DCD). The most distinguishing feature of this method is that it directly picks up the phase modulation amplitude from the interference signal by series of mathematical calculation and synchronically used in subsequent demodulation processing. So, the variation of phase modulation amplitude, induced by the internal or external disturbances, can be directly detected and synchronically updated in demodulation. The theoretical derivation and simulation experiment show that this approach is robust to the variation of phase modulation amplitude, and is a potential demodulation algorithm for FOIS, especially for large-scale FOIS array.

Paper Details

Date Published: 12 December 2018
PDF: 7 pages
Proc. SPIE 10849, Fiber Optic Sensing and Optical Communication, 108490A (12 December 2018); doi: 10.1117/12.2503786
Show Author Affiliations
Shuwang Li, China Electronic Product Reliability and Environmental Testing Research Institute (China)
Guoguang Lu, China Electronic Product Reliability and Environmental Testing Research Institute (China)
Canxiong Lai, China Electronic Product Reliability and Environmental Testing Research Institute (China)
Yunfei En, China Electronic Product Reliability and Environmental Testing Research Institute (China)


Published in SPIE Proceedings Vol. 10849:
Fiber Optic Sensing and Optical Communication
Jie Zhang; Songnian Fu; Qunbi Zhuge; Ming Tang; Tuan Guo, Editor(s)

© SPIE. Terms of Use
Back to Top