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検査・光学
stress-optic coefficient
Japanese: 応力光学係数
A constant linking stress and birefringence (Brewster's constant). It is used to convert stress based on the color of a polarizing filter. / Note: Soda-lime glass: approx. 2.5–2.7; lead-based glass has a lower value.
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The stress-optic coefficient (Bullseye constant B) is a constant that relates the stress applied to glass to the resulting birefringence. For the Bullseye COE90 series, it is approximately 2.5×10⁻¹² Pa⁻¹.
It is used to calculate the magnitude of stress based on the interference colors (retardation) observed through a polarizing filter.
This entry is written in Japanese by Rei Chikaoka and translated for readers outside Japan. If something reads oddly, the original is the source of truth.