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High-speed holographic microscopy for fast-propagating cracks in transparent materials

机译：高速全息显微镜，用于快速传播透明材料中的裂纹

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摘要

A method of high-speed holographic microscopy is developed to take three successive microscopic photographs of a crack tip propagating in a transparent poly(methyl methacrylate) specimen at a speed of several hundred meters per second. When a crack is propagating in a specimen, three Q-switched ruby lasers emit three laser pulses successively. The time interval between each laser pulse and the next is 1 mu s or longer. An optical system of angle-multiplexing holography records the crack as three successive holograms on one photographic plate. Crack images are reconstructed and photographed through a conventional microscope. The spatial resolution of the reconstructed images is approximately 114 lines/mm. From the photographs, one can measure crack speed, crack opening displacement, and the dynamic stress intensity factor. The high-speed holographic microscopy makes it possible to study rapid crack propagation in microseconds. (C) 1997 Optical Society of America.
机译：发展了一种高速全息显微镜的方法，以连续三张显微照片拍摄裂纹尖端以每秒几百米的速度在透明的聚（甲基丙烯酸甲酯）样品中传播。当裂纹在样品中扩展时，三个Q开关红宝石激光器会连续发射三个激光脉冲。每个激光脉冲与下一个激光脉冲之间的时间间隔为1毫秒或更长。角度多路全息术的光学系统将裂纹记录为一张照相板上的三个连续全息图。裂纹图像通过常规显微镜重建并拍照。重建图像的空间分辨率约为114线/毫米。从这些照片中，可以测量裂纹速度，裂纹张开位移和动态应力强度因子。高速全息显微镜使研究微秒级的快速裂纹扩展成为可能。 （C）1997年美国眼镜学会。

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