Zhang Yingfang, Xu Ben, Wang Dongning, Guo Yun, Chen Min, Chen Weicheng, Guo Penglai, Peng Xiaoling, Li Jianqing
Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, China.
The College of Optical and Electronic Technology, China Jiliang University, No. 258, Xueyuan Street, Xiasha Higher Education Zone, Hangzhou 310018, China.
Sensors (Basel). 2021 Feb 3;21(4):1023. doi: 10.3390/s21041023.
A hollow biconical fiber is proposed and experimentally demonstrated for vibration sensing. It is fabricated by creating an air micro-cavity in single-mode fiber, followed by tapering it. Experimental results show that the device is highly sensitive to bending with a sensitivity of 21.30 dB/m. When it is exposed to vibration, its transmission loss is modulated periodically, then based on the measured transmission, the vibration frequency can be demodulated accurately. The acoustic vibration testing results show that the proposed device can detect and demodulate the exciting acoustic frequency accurately and distinguish its sound intensity, and the maximum signal to noise ratio (SNR) achieves up to 59 dB. Moreover, cantilever beam testing proves its performance reliable. Additionally, the sensing head has the advantages of a lightweight, compact size (with a total length of less than 250 μm), and insensitivity of temperature. All these features indicate the proposed sensor has a promising potential in the engineering field.
提出了一种用于振动传感的中空双锥光纤，并进行了实验验证。它是通过在单模光纤中创建一个空气微腔，然后对其进行拉锥制作而成。实验结果表明，该装置对弯曲高度敏感，灵敏度为21.30 dB/m。当它受到振动时，其传输损耗会周期性地调制，然后基于测量的传输，可以准确地解调振动频率。声振动测试结果表明，所提出的装置能够准确地检测和解调激励声频率，并区分其声强，最大信噪比（SNR）可达59 dB。此外，悬臂梁测试证明了其性能可靠。此外，传感头具有重量轻、尺寸紧凑（总长度小于250μm）和对温度不敏感的优点。所有这些特性表明，所提出的传感器在工程领域具有广阔的应用前景。
