Photoelastometric recording of stress waves |
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Authors: | D M Cunningham G W Brown J C Griffith |
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Institution: | 1. University of California, Berkeley 2. Lawrence Radiation Laboratory, Livermore, Calif.
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Abstract: | A very sensitive, fast-responding photomultiplier tube and laser light source were used to record stress-optic data associated with a moving stress wave. By using a “gray-field” (which is halfway between a dark and light field) polariscope, optical-electrical recordings were obtained which were linearly proportional to strain. A discriminatory record results which exhibits a higher signal-to-noise ratio than semiconductor strain gages. Gage length can be varied from 0.005 in. upwards. |
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