公开(公告)号：US5457539A

公开(公告)日：1995-10-10

申请号：US79344

申请日：1993-06-18

Applicant: Steven P. Sturm

Inventor： Steven P. Sturm

IPC: G01D18/00 ,  G01N21/86 ,  G01N21/84 ,  G01N21/00

CPC classification number: G01D18/00 ,  G01N21/86 ,  G01B2210/42 ,  G01B2210/44

Abstract: A focused light beam instrument measures characteristics of webs of sheet material. The instrument and a reference surface, a backing tile in a carousel, are on opposite sides of the web which is maintained a fixed distance from the reference surface by a Bernoulli hold down device such that variations in the gap affect the beam focus. The instrument and reference surface scan the web via a scanning frame. The instrument is calibrated-standardized in an off sheet position where a first surface, a carousel backing tile, is moved opposite to the instrument and in the plane of the web. The instrument measures the first surface and a second surface, another carousel backing tile, which is moved opposite to the instrument but spaced farther from or closer thereto than the first surface. The distance of the instrument from the web is calculated from the difference between the measurements of the first and second surfaces. The calculated distance is used to determine an operating position on an instrument response curve and the instrument is calibrated accordingly. A second or third order polynomial is fitted to the instrument response curve and differentiated at the operating point on the curve to determine the rate of change of the measurement characteristic of the instrument at that point. Gap changes and the determined rate of change of the measurement characteristics are used to compensate gap change errors in measurements made by the instrument.

Abstract translation: 聚焦光束仪器测量片材材料的特性。 仪器和参考表面，圆盘传送带中的背衬瓦片位于腹板的相对侧上，其通过伯努利压紧装置与参考表面保持固定的距离，使得间隙的变化影响射束的聚焦。 仪器和参考表面通过扫描框架扫描网。 仪器在离纸位置校准标准化，其中第一表面，圆盘传送带背衬瓦片与仪器相对移动并且在幅材的平面中移动。 该仪器测量第一表面和第二表面，另一个转盘背衬瓦片，其与仪器相反地移动，但与第一表面相距更远或更靠近第一表面。 根据第一和第二表面的测量值之间的差异计算仪器与幅材的距离。 计算的距离用于确定仪器响应曲线上的操作位置，并相应地校准仪器。 将二阶或三阶多项式拟合到仪器响应曲线上，并在曲线上的工作点进行微分，以确定仪器在该点的测量特性的变化率。 间隙变化和确定的测量特性的变化率用于补偿由仪器进行的测量中的间隙变化误差。

公开(公告)号：US5563809A

公开(公告)日：1996-10-08

申请号：US223702

申请日：1994-04-06

Applicant: Paul Williams ,  Tom Domin ,  Eugene S. Green ,  Roger A. Holmes

Inventor： Paul Williams ,  Tom Domin ,  Eugene S. Green ,  Roger A. Holmes

IPC: G01N9/02 ,  G01N9/24 ,  G01N21/89 ,  G01N33/34 ,  G01N33/36 ,  G01N33/44 ,  G06F19/00

CPC classification number: G01N9/24 ,  G01N21/8903 ,  G01N33/346 ,  G01N2009/024 ,  G01N33/367 ,  G01N33/44

Abstract: A paper web is monitored for measurement and manufacturing control by a stationary web sensor extending across the entire web which is raster scanned by the motion of the web. Massive amounts of data are processed by a look up table memory addressed by digitized sensor data and the output from a reference memory containing element specific information. The lookup table is loaded with data to define a characteristic or property of the web corresponding to digitized sensor data interpreted in view of element specific data from the reference memory. Rapidly processed data is stored in a memory in a form facilitating its display and interpretation by an operator of the web manufacturing machine and also control of the machine. By controlling operation of the machine, uniformity of the web is substantially improved and, by taking the measurements closely adjacent the initial processing end of the web, corrections of nonuniformity in the web are quickly effected. To measure and control absolute characteristics and properties of the web, a second, preferably stationary, sensor adjacent the finished end of the web monitors the web adjacent a takeup reel. Alternately, for basis weight measurement and control, the weight of the takeup reel is monitored and combined with the web width and machine operating speed to determine an absolute web basis weight. Thus, uniformity of the web and absolute values of characteristics and properties of the web can be measured and controlled.

Abstract translation: 监测纸幅通过延伸穿过整个纸幅的固定纸幅传感器进行测量和制造控制，其通过纸幅的运动进行光栅扫描。 由数字化传感器数据寻址的查找表存储器和来自包含元件特定信息的参考存储器的输出来处理大量数据。 查找表加载有数据，以便根据来自参考存储器的元素特定数据解释的数字化传感器数据来定义对应于卷筒纸的特性或属性。 快速处理的数据以便于其由web制造机器的操作者显示和解释的形式存储在存储器中，并且还控制机器。 通过控制机器的操作，幅材的均匀性得到显着提高，并且通过将测量值紧密接近幅材的初始处理端，可以快速实现幅材不均匀性的校正。 为了测量和控制幅材的绝对特性和性能，邻近幅材的完成端的第二，优选静止的传感器在卷绕卷轴附近监测纸幅。 或者，对于基重测量和控制，收集卷轴的重量被监测并与纸幅宽度和机器操作速度相结合以确定绝对纸幅的基重。 因此，可以测量和控制幅材的均匀性和幅材的特性和性质的绝对值。