| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting system for a noncontact extensiometer which is simple in constitution, enabling the stable and certain imaging of the marked line applied to the surface of a test piece, regardless of the shaper of the test piece. SOLUTION: The lighting system of the non-contact extensiometer is equipped with a diffusion illumination light source 20, which is a light source for illuminating the test piece S mounted on a tester main body to be subjected to a tensile test and has a sufficiently wide lighting surface with respect to the surface region of the test piece S, for uniformly illuminating the surface to which marked lines R1, R2 are applied of the test piece S from many directions. More specifically, the diffusion illumination light source consisting of a straight pipe fluorescent lamp (light source body) 21 provided along the extension direction of the test piece and the diffusion plate 22 interposed between the light source body, and the test piece and diffusing and transmitting the light emitted from the light source body is provided. Especially, the diffusion plate is formed into a curved shape, so as to surround the surface to which marked lines are applied of the test piece.
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