Wang Xu, Wang Shanjin, Zhou Ziqiang, Wang Fang
Appl Opt. 2023 Sep 1;62(25):6672-6679. doi: 10.1364/AO.495062.
A multi-longitudinal mode (MLM) laser beat-frequency optical fiber vibration sensor using a frequency modulation (FM) radio integrated circuit module as the FM demodulation scheme is presented and demonstrated. To the best of our knowledge, this is the first case where a fiber-optic sensing system is combined with an FM radio module, and dynamic sensing is well achieved. As the carrier of the vibration source, the beat-frequency signal (BFS) generated by the MLM laser is transmitted to the FM radio module for FM and demodulation. The experimental results show that the system can successfully detect the vibration signal in the frequency range of 20 Hz to 18 kHz and accurately demodulate the waveform and amplitude of the vibration signal source. The minimum shape variable detected by the system is 20.67 nm, based on the performance of the commercial FM radio module itself, which can effectively solve the problem of detecting tiny vibration. The idea of the optical fiber vibration sensing system is extremely innovative, with high sensitivity, high signal-to-noise ratio (SNR), good stability, and strong resistance to electromagnetic interference.
提出并演示了一种采用调频（FM）无线电集成电路模块作为调频解调方案的多纵模（MLM）激光拍频光纤振动传感器。据我们所知，这是光纤传感系统与调频无线电模块相结合并很好地实现动态传感的首例。作为振动源的载体，MLM激光器产生的拍频信号（BFS）被传输到调频无线电模块进行调频和解调。实验结果表明，该系统能够成功检测20Hz至18kHz频率范围内的振动信号，并准确解调振动信号源的波形和幅度。基于商用调频无线电模块本身的性能，系统检测到的最小形变量为20.67nm，能够有效解决微小振动检测问题。该光纤振动传感系统的理念极具创新性，具有高灵敏度、高信噪比（SNR）、良好的稳定性以及强抗电磁干扰能力。
