All-digital demodulation system of interferometric fiber optic sensors using an improved PGC algorithm based on fundamental frequency mixing

Abstract

We present an all-digital demodulation system of interferometric fiber optic sensor based on an improved arctangent-differential-self-multiplying (arctan-DSM) algorithm. The total harmonic distortion (THD) and the light intensity disturbance (LID) are also suppressed, the same as those in the traditional arctan-DSM algorithm. Moreover, the lowest sampling frequency is also reduced by introducing anti-aliasing filter, so the occupation of the system memory is reduced. The simulations show that the improved algorithm can correctly demodulate cosine signal and chirp signal with lower sampling frequency.

Keywords

Sensor Signal / Modulation Depth / Digital Signal Processor / Total Harmonic Distortion / Chirp Signal

References

[1] LiaoY, AustinE, NashP J, KingsleyS A, RichardsonD J. Journal of Lightwave Technology, 2013, 31: 882

[2] HuangS-C, HuangY-F, HwangF-H. Sensors and Actuators A: Physical, 2013, 191: 1

[3] WangG-q, XuT-W, LiF. IEEE Photonics Technology Letters, 2012, 24: 2093

[4] FengX, ZhangC, LiangS, LiC, ZhangC. Microwave and Optical Technology Letters, 2011, 53: 20

[5] JiangY. Optics Letters, 2008, 33: 1869

[6] LinW, JunH, FangL, YuliangL. Chinese Journal of Lasers, 2011, 38: 0405001

[7] TongY, ZengH, LiL. Applied Optics, 2012, 51: 6962

[8] HeJ, WangL, LiF, LiuY. Journal of Lightwave Technology, 2010, 28: 3258

[9] GongM-j, DengY, QiaoD-h, ShaoM, LiG-x, YangF-q. Piezoelectectrics and Acoustooptics, 2008, 30: 538

[10] YangL, Xiao-xingS, YanL, Zhi-boL, LinM, Ti-gangN, Shui-shengJ. Journal of Optoelectronics ·Laser, 2012, 23: 933

[11] YabinZ, ZhengD, YongW, JianianCThe Lowest Sample Frequency of PGC Demodulation Method for Interferential Fiber-Optic SensorSymposium on Photonics and Optoelectronics, 2010, 1

Just Accepted

This article has successfully passed peer review and final editorial review, and will soon enter typesetting, proofreading and other publishing processes. The currently displayed version is the accepted final manuscript. The officially published version will be updated with format, DOI and citation information upon launch. We recommend that you pay attention to subsequent journal notifications and preferentially cite the officially published version. Thank you for your support and cooperation.