| 摘要 |
<p>PURPOSE:To enable accurate measurement of a sheet-like object by providing two sensor heads reciprocated in a direction perpendicular to the running direc tion, a speed sensor and arithmetic operation control means. CONSTITUTION:The sensor heads 2, 3 are reciprocated within frames 20, 30 in a direction approximately perpendicular to the running direction of the sheet- like object 1 with the speed sensor 4 sensing the running speed of the object 1. Assuming that the head 2 is scanning at a constant speed, should the speed of the object be changed, the time point when the scanning start point of the head 2 arrives at the head 3 downstream by a distance L and the speed of the object 1 sensed by the sensor 4 are stored and computed in a memory- operating device 5 for controlling driving devices 21, 31 driving the heads 2, 3. Hence, the head 3 faithfully follows the locus of the detected points of the head 2 for accurately measuring the properties of the sheet-like object 1.</p> |
