公开(公告)号：WO1996035112A1

公开(公告)日：1996-11-07

申请号：PCT/US1996006157

申请日：1996-05-02

Applicant: MEASUREX CORPORATION

Inventor： MEASUREX CORPORATION ,  CHASE, Lee, M. ,  FOSKETT, Anthony, D.

IPC: G01N21/86

CPC classification number: G01N21/86

Abstract: An on-line laser triangulation position sensing system provides measurements of the surface features of a moving sheet such as paper. The measurements are correlatable with measurements made with standard laboratory surface smoothness testers and provide predictions of the printability of paper during its fabrication. The sensing system includes a segmented balance detector having a high frequency response. The sensing system further includes signal processing circuitry comprising a plurality of channels, each channel including a filter. The various filters have different cutoff frequencies for passing different frequency spectra representing ranges of surface feature scale sizes. The cutoff frequency of each filter is varied in response to variations in sheet speed. The sheet sensing system further includes a sheet stabilizer to minimize flutter in the measurement region and a standardizing member permitting performance verification of the sensor system at at least one scale size spectrum. The sensing system may also be provided with a sheet compressor to compress the sheet in the measurement region so as to simulate the pressures applied to sheet samples by laboratory air leak smoothness testers. The output of the position sensing system may be used in conjunction with various kinds of papermaking machines to control one or more of the many papermaking process parameters that determine the smoothness or texture of the final product. The sensing system can be used to measure tissue crepe and such measurement can be utilized to control various crepe-determining stages in a tissue making machine and to monitor the condition of the creping or doctor blade in such a machine.

Abstract translation: 在线激光三角测量位置感测系统提供诸如纸张的移动片材的表面特征的测量。 测量值与使用标准实验室表面平滑度测试仪进行的测量值相关，并提供纸张在其制造过程中的可印刷性的预测。 感测系统包括具有高频响应的分段平衡检测器。 感测系统还包括包括多个通道的信号处理电路，每个通道包括滤波器。 各种滤光器具有不同的截止频率，用于通过表示特征尺度尺寸范围的不同频谱。 每个过滤器的截止频率响应于纸张速度的变化而变化。 片材感测系统还包括片材稳定器，以最小化测量区域中的颤动;以及标准化构件，允许以至少一个尺度尺度光谱对传感器系统进行性能验证。 感测系统还可以设置有片材压缩机，以压缩测量区域中的片材，以便模拟通过实验室空气泄漏平滑度测试仪施加到片材样品的压力。 位置检测系统的输出可以与各种造纸机一起使用，以控制确定最终产品的平滑度或纹理的许多造纸工艺参数中的一个或多个。 感测系统可用于测量组织绉纱，并且可以利用这种测量来控制组织制作机中的各种绉纱确定阶段，并监测这种机器中起皱或刮刀的状况。