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  • Title: Multimode fiber laser for simultaneous measurement of strain and temperature based on beat frequency demodulation.
    Author: Gao L, Chen L, Huang L, Chen X.
    Journal: Opt Express; 2012 Sep 24; 20(20):22517-22. PubMed ID: 23037400.
    Abstract:
    A multimode fiber laser sensor system for simultaneous measurement of strain and temperature is proposed and demonstrated. Because of the long cavity and birefringence, longitudinal mode beat frequency and polarization mode beat frequency are achieved in the beat frequency signals of the multimode fiber laser. The strain and temperature can be obtained by monitoring both of them for their different strain and temperature responses. The experimental measurement errors are within ± 16.2 με and ± 1.9 °C. The usage of only one fiber laser and one demodulation system makes the system simple, cost-effective and portable.
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