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An Automatic Fringe Analysis Interferometer for Rapid Moire Stress Analysis

In optical methods of stress analysis, the reduction of raw data to engineering quantities has proved to be a difficult problem. A portable instrument has been developed which interrogates a specimen grid point-wise using a narrow beam of coherent light, and electro-optically measures interference-fringe-spacing, in three directions simultaneously. A microprocessor is incorporated to convert the strain component values to convenient quantities such as principal stress and shear, and these are displayed. The read-rate is adjustable up to 5 kHz, the discrimination level is 4 µε, and a facility for temperature compensation is included. The logic behind the design of the major features of the unit are described.