公开(公告)号：US4612807A

公开(公告)日：1986-09-23

申请号：US671858

申请日：1984-11-15

申请人： Bernd Wunderer

发明人： Bernd Wunderer

IPC分类号： G01G17/02 ,  G01B17/00 ,  G01N29/00 ,  G01N29/04 ,  G01N29/11 ,  G01N33/34 ,  G01S15/88 ,  G07D7/08 ,  G07D7/16

CPC分类号： G01N33/346 ,  G01N29/11 ,  G01B2210/44 ,  G01N2291/0237 ,  G01N2291/048 ,  G01N2291/102 ,  G01N2291/105

摘要： The invention relates to an apparatus for dynamically determining the local weight per unit area of sheet-like material, for example, paper, in which the sheet-like material is exposed to sound waves from a sound transmitter. The portion of sound transmitted and/or reflected by the sheet-like material is measured by aid of a receiver and the weight per unit area determined from the measuring signal. In order to avoid disturbances of the measuring signal due to superimposed sound waves and in order to obtain high local resolution even in the case of quickly moving material to be measured, the transmitter, material to be measured and possibly the receiver as well are arranged on a slant relative to each other in such a way that the portions of sound reflected on these elements are faded out of the path of rays between the transmitter and the receiver. Means are additionally provided to prevent the faded out portions of sound from returning to the path of rays between the transmitter and the receiver.

摘要翻译： 本发明涉及一种用于动态地确定片状材料（例如纸张）每单位面积的局部重量的装置，其中片状材料暴露于来自声音发射器的声波。 由片状材料传播和/或反射的声音的部分通过接收器和从测量信号确定的每单位面积的重量来测量。 为了避免由于重叠的声波引起的测量信号的干扰，并且即使在快速移动要测量的材料的情况下，为了获得高的局部分辨率，发送器，要被测量的材料和可能的接收器也被布置在 相对于彼此倾斜，使得在这些元件上反射的声音的部分在发射器和接收器之间的光线路径之外消失。 附加地提供装置以防止声音的淡出部分返回到发射器和接收器之间的光线路径。