Figure 6. 20 illustrates a commercially available fringe multiplication and fringe sharpening apparatus mounted on a polariscope specially designed to facilitate these applications . 图6.20所示为一台市售的条纹倍增和细化装置，它安装在一台便于使用的专门设计的偏振光弹仪上。
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Figure 6 . 20 illustrates a commercially available fringe multiplication and fringe sharpening apparatus mounted on a polariscope specially designed to facilitate these applications 图6 . 20所示为一台市售的条纹倍增和细化装置，它安装在一台便于使用的专门设计的偏振光弹仪上。
