| 摘要 |
PURPOSE:To accurately measure an external diameter by an inexpensive scattered light source by arranging two measurement systems consisting of diffused light sources and image sensors so that their optical axes are on the coordinate axes of a two-dimensional coordinate system on a plane perpendicular to the axis of a body to be measured. CONSTITUTION:For an external diameter measuring method which measures the external diameter of the circularly-sectioned, long-sized body 3 to be measured, one measurement system consists of a line sensor camera 1 and a scattered light source 4 and another measurement system consists of a line sensor camera 2 and a scattered light source 5. The light sources X and Y of those two measurement systems constitute the X axis and Y axis of the two-dimensional orthogonal coordinate system and are so arranged that their origin meets the center of the section of the body 3 to be measured 3 in a stationary state. When the body 3 to be measured moves from a solid-line to a dotted line, the quantities of shifts of the center positions of the image of the body 3 to be measured from the center points of the lines sensors 1b and 2b are measured from video signals from the line sensors 1b and 2b to find the sectional center coordinates X0 and Y0 of the body 3 to be measured. Then, the length of the image of the body 3 to be measured is measured and the external diameter of the body 3 to be measured is found from a specific arithmetic expression.
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