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Optical birefringence is measured by a high-frequency modulation method using a photoelastic modulator and polarized laser. The modified synthesis method was developed and applied for the measurement of stress distributions of a glass plate. The distributions of the differences of principal stresses and their directions were obtained directly by this method. The stress distributions of a pulled rectangular glass plate with a small hole at its center were measured. The results of stress distributions agreed with the analytical results. It was confirmed experimentally that the spatial resolution of stress measurement had the same size as the diameter of laser light. The stress at many points could be obtained quickly by the synthesis method and the scanning stress distribution measurement was realized.
