| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a stress measuring device and a stress measuring method capable of measuring optical path difference with higher accuracy, by removing a problem of color irregularity of a background color, and by reducing a measurement error caused by a sense generated in each measurer relative to the optical path difference and a measurement error caused by the color irregularity of the background. Ž<P>SOLUTION: This device includes: a background illumination means 1 including a white light source 1a; first and second polarizing plates 2, 3 forming a crossed Nicol state; a sensitive color plate 4 constituted so that a green (G) value becomes minimum in the state of the optical path difference 0 nm; a photographing means 5 for photographing an image transmitted through the members 2, 3, 4; and an analysis means 6 for operating a difference between a background color RGB value acquired from image data of only the background color and an optical path difference standard plate RGB value acquired from image data including an optical path difference standard plate to use the result as a reference RGB value, using a difference between a measured sample RGB value acquired from image data of a measured sample and the reference RGB value as an optical path difference estimated value, and operating by adding a thickness of the measured sample and a photoelastic coefficient of the material to the optical path difference estimated value, to thereby determine a stress value of the measuring sample. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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