一、序论对精密机械零件、结构物或小型振子、音响转换元件等的振动状态作分析时,测定微小振动振幅是必要的。测振幅采用光干涉方法是有效的手段。但是,作为前提,没有被照射物体并能构成干涉的条件就无法利用。将光导纤维应用于干涉仪的光路中,出于弯曲光路仍能导光,即使在这样困难的场合下 I. Preface It is necessary to measure the amplitude of small vibration when analyzing the vibration state of precision machinery parts, structures, small vibrators, audio transducers, etc. Measuring the amplitude using optical interference methods is an effective means. However, as a prerequisite, conditions that are not illuminated and interfere with each other can not be used. The optical fiber used in the optical path of the interferometer, out of the curved optical path can still light, even in such difficult situations