A miniature vibration sensor based on a compact microfiber probe is proposed and experimentally demonstrated. The microfiber probe is simply fabricated by snapping a multimode biconical microfiber in the fused tapering process. Vibration causes periodic bending and axial extension of microfiber probe, resulting in the change of phase difference between fundamental mode and high-order modes. The vibration signal can be obtained by demodulated the reflected light signal with fast Fourier transform. The experimental result shows that the vibration sensor not only can exactly measure the frequency of the applied sinusoidal vibration signal, but also has a wide frequency measurement range of 20 Hz-2 kHz. The advantages of compact size and high accuracy make the vibration sensor have great application prospects.
We proposed and demonstrated a stable, label-free bacteriophage-based sensor of Escherichia coli using microfiber probe. T4 Bacteriophage was covalently immobilized on microfiber surface and E.coli concentration was investigated using the high accurate spectral interference mechanism. By immersing microfiber sensor into different concentration E.coli solution, the relationship between resonant wavelength shift and E.coli concentration was analyzed in the range of 103-107cfu/ml. The proposed method is capable of reliable detection of E.coli concentration as low as 103cfu/ml with a fast response time about 10minutes, which makes the real-time detection of E.coli move on a giant step. Additionally, the sensor has great potential to be applied in the fields like environment monitoring and food safety.
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