| 摘要 |
PURPOSE:To make it possible to measure the normal line direction of the surface of a work, by providing four sensors, low-pass filters and high-pass filters supported in a freely rotatable manner. CONSTITUTION:When the probe needles of four sensors 1, 1,... are contacted with a free curved surface of a work 15, said probe needles are contacted with the recessed and protruded parts of a cut groove and the variance H measured by the sensors 1, 1,... is varied. Next, low-pass filters 2 are individually connected to individual sensors 1 one at a time in series to remove electrical noise. Then, the direction of a normal line at a measuring point x1 is calculated under such a condition that the effect of the cut groove is removed by a signal processor 20. When the roughness of the free curved surface of the work 15 is measured, the transmission route of a detected value is changed over from the side of low-pass filters 2 to the side of high-pass filters 3 and only the high frequency component corresponding to the cut groove is sent out to the signal processor 20 and the roughness of the curved surface can be measured. |
