A new advanced suspended-core fiber sensor is proposed and demonstrated for ultrasonic detection. The free micro suspended-core fiber is fabricated by acid corrosion and fiber splicing. Significantly, two cascaded uniform fiber Bragg gratings are imprinted into the suspended-core fiber. The sensor response and spectrum stability are thus largely improved because of the using of two fiber grating reflectors for constructing a suspended-core interferometer. This paper shows the sensor fabrication in detail and presents contrastive analysis of the spectrum characteristics. Preliminary measurements are also carried out to verify the enhanced acoustic performance of the dual-FBG suspended-core fiber. The proposed sensor is a good candidate for high-fidelity ultrasonic detection in seismic physical modeling.
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