| 摘要 |
PURPOSE:To measure elongation and contraction of a specimen without dispersion by applying a load on the specimen wherein the length of a region to be measured is the part between marking lines whose optical characteristic is different from the other part of the surface, and scanning the part corresponding to the marking lines by a television camera and the like. CONSTITUTION:Two marking lines Q are provided on the specimen S such as rubber or the like and part between them is made to be the length of the region to be measured. The optical characteristics such as lightness is made different from the other region of the surface of the specimen. The load is applied so that the length of the region to be measured becomes long by a load applying means. The specimen S is scanned by the surface scanning device such as a television camera, and its output is given to a signal processor. A measuring range specifying signal is generated based on the output of the scanning device. The pulse signal corresponding to the length of the region to be measured is obtained, and the pulse interval T is measured. Even though a clamp and the like for holding the specimen is present in the scanning range, accurate measuring can be performed without the effect of the clamp. |
