Abstract
The paper proposes a high-resolution static strain sensor based on the random fiber laser (RDFL) and the beat frequency method. A π-FBG is used as the sensing element in the RDFL. A narrow-linewidth laser source is frequency-locked to a reference π-FBG by the Pound-Drever-Hall (PDH) technique. The RDFL beats frequency with the frequency-locked laser to achieve a narrower-linewidth beat frequency signal. The 3 dB linewidth and the frequency shift of the beat requency signal are respectively 380 Hz and 27.2 kHz. By tracing the frequency shift of the beat frequency signal, a static strain resolution of 0.18 nε level is achieved.
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