光纤全息散斑干涉计量

脉冲激光经光导纤维传输后，其偏振性变化为随机分布，相干性有所降低，但它用在全息干涉计量中却有突出的优点，对于涉条纹的形成和清晰度没有影响。经常使用的光纤散斑全息干涉系统有两种类型：一种是只用传光束形成物光，参考光，此种系统形成的全息象清晰度有所下降，但做全息干涉计量时对条纹的衬比度和清晰度没有任何影响．另一种类型是物光和参考光都是用光导纤维传输，然后用光纤传象束将物体的象进行传输，再用透镜将其成象在底片上，做双曝光全息干涉时则形成全息散斑干涉计量，用全息方法再现时干涉图类似“杨氏”条纹。本文对上述两种系统，结合实验结果、分三种情况进行了研究。文章共分为三个部分：（一）引言；（二）散斑全息干涉计量；（三）结论。

OPTICAL FIBER HOLOGRAPHIC SPECKLE INTERFEROMETRY

Pulsed laser is transmitted by optical fibers,the polarity is changed into random distrlbution and the coherence is decreased somewhat.But when used in holographic inter ferometry,optical fibers have substantial advantages, having no ioffuence on formation and clarity of coherent fringes.Two kinds of optical fiber speckle holographic interferometry System are often used. The first kind employs optical bundle to fom object and reference beams respectively.The clarity of the formed hologram decreaseS somewhat,but there is no effect on the contrast and clarity of holographic interferometry fringe. On the basis of the above system,the other makes use of multimode optical fiber bundle for transrnitting the image of object,and applyling lens imaging on the plate. Used in double exposure holographic interferometry the system forms holographic speckle interferometry,subsequently reconstructed coherent pattern is similar to Young’s fringe.In this paper,the above two systems are investigates through experimental results under three kinds of conditions.