Kyuma K, Tai S, Hamanaka K, Nunoshita M
Appl Opt. 1981 Jul 15;20(14):2424-7. doi: 10.1364/AO.20.002424.
A practical laser Doppler velocimeter with optical fibers in the whole system was developed. The novel optical probe designed for this LDV is constructed of a graded-index rod lens attached to the end of an optical fiber. Since the laser beam from the probe is well collimated, the velocity accuracy and sensitivity are significantly improved. Mechanical vibration measurements were also carried out with this LDV; vibration amplitude down to 1.0 microm p-p can be measured at a frequency of 120 Hz with high accuracy.
开发了一种在整个系统中使用光纤的实用激光多普勒测速仪。为该激光多普勒测速仪设计的新型光学探头由连接在光纤末端的渐变折射率棒透镜构成。由于来自探头的激光束得到了很好的准直，速度精度和灵敏度得到了显著提高。还用该激光多普勒测速仪进行了机械振动测量；在120 Hz频率下，可以高精度测量低至1.0微米峰峰值的振动幅度。
