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为了验证全光纤多普勒测速系统的低速响应能力,采用窄带光纤激光器、准直透镜等器件搭建了一套迈克尔逊干涉仪结构的全光纤多普勒测速系统,分析了其测速的基本原理,并对喇叭振动进行了测试。采用快速傅里叶变换对信号进行处理,解调结果表明,该系统对低速响应灵敏,能够有效地测量出喇叭膜片振动速度,最低可测速度在1mm/s以下,速度分辨率可达0.1mm/s。
In order to verify the low speed response capability of all-fiber Doppler velocimetry system, a set of Michelson interferometer structure-based all-fiber Doppler velocimetry system is set up by using narrow-band fiber lasers and collimating lenses. The basic principle of velocity measurement is analyzed. And speaker vibration was tested. The signal is processed by Fast Fourier Transform. The demodulation results show that the system is sensitive to low speed and can measure the vibration velocity of the loudspeaker diaphragm effectively. The minimum measurable speed is under 1mm / s and the speed resolution is up to 0.1 mm / s.