全光纤多普勒测速系统的研究

Study on All Fiber-optic Laser Doppler Velocimeter

摘要:

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。

Abstract:

A fiber-optic laser Doppler velocimeter based on Michelson interferometer was described and constructed with fiber laser and fiber collimator.In the experiment of measuring the weak vibration of loudspeaker,good agreement was observed between the fiber-velocimeter and the driving signal.The experiment data dealt with FFT method shows that this system is capable of resolving the velocity less than 1 mm/s,and the resolution is about 0.1 mm/s.