Distributed feedback fiber laser for sub-nanostrain-resolution static strain measurement by use of swept beat-frequency demodulation

Wenzhu Huang; Wentao Zhang; Fang Li

doi:10.1117/12.2184018

1 July 2015 Distributed feedback fiber laser for sub-nanostrain-resolution static strain measurement by use of swept beat-frequency demodulation

Wenzhu Huang, Wentao Zhang, Fang Li

Author Affiliations +

Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 965504 (2015) https://doi.org/10.1117/12.2184018
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of

Abstract

Fiber laser has the advantages of ultra-narrow linewidth, low phase and intensity noise, which is beneficial for ultra-high-resolution strain sensing. This paper presents a novel demodulation technique for sub-nanostrain-resolution static strain measurement based on two distributed feedback fiber lasers (DFB FLs). A commercial PZT-tunable laser is used to interrogate the DFB FLs and get the periodic frequency-difference characteristics (two linear chrip signals) by swept beat-frequency principle. Two polarization controllers are used for adjusting the polarization direction of DFB FLs. And one of the two DFB FLs is used for temperature compensation and eliminating the frequency shift influence of the commercial laser. Static strain is demodulated by calculating the difference of the direct current (DC) components of the two swept beat-frequency signals. A static-strain resolution of 0.88 nε is obtained in the laboratory test.

Citation Download Citation

Wenzhu Huang, Wentao Zhang, and Fang Li "Distributed feedback fiber laser for sub-nanostrain-resolution static strain measurement by use of swept beat-frequency demodulation", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 965504 (1 July 2015); https://doi.org/10.1117/12.2184018

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