公开(公告)号：US4517845A

公开(公告)日：1985-05-21

申请号：US501630

申请日：1983-06-02

申请人： Anders P. Ransheim ,  Arne Thomsen ,  Per Holmgren

发明人： Anders P. Ransheim ,  Arne Thomsen ,  Per Holmgren

IPC分类号： G01F1/704 ,  G01P5/18 ,  G01P5/20 ,  G01F1/70

CPC分类号： G01P5/20 ,  G01F1/704 ,  G01P5/18

摘要： A method and an apparatus for measuring the flow velocity of a flow, stream or jet of molten radiation emitting material, in particular a freely falling jet of molten glass. The intensity of the radiation emitted from a limited section of the material flow is detected by means of two radiation detectors at two separate locations mutually spaced apart by a predetermined distance along the flow path of the material flow. From the output signals of the two radiation detectors all pulse-like amplitude variations having an amplitude exceeding a predetermined magnitude are discriminated. These pulse-like amplitude variations originate from randomly occurring, local, descrete, short variations in the intensity of the radiation emitted by the material flow caused by randomly occurring inhomogeneities in the material, for instance in the form of air bubbles in a jet of molten glass. The time interval between a pulse-like amplitude variation in the output signal from the upstream detector caused by an inhomogeneity in the material flow and the occurrence of a pulse-like amplitude variation in the output signal from the down-stream detector, which has been caused by the same inhomogeneity in the material flow, is measured and used as a measure of the travel time of the material flow between the detector locations for calculating the flow velocity of the material flow. Also the volumetric flow rate of the material flow can be determined by measuring also the diameter of the material flow with the aid of a linear array of photo diodes and calculating the volumetric flow rate on the basis of measured values of the flow velocity and the diameter.

摘要翻译： 用于测量熔融辐射发射材料的流动，流或射流的流速的方法和装置，特别是熔融玻璃的自由下落射流。 从材料流的有限部分发射的辐射的强度通过沿着材料流的流动路径彼此间隔开预定距离的两个分开的位置处的两个辐射检测器来检测。 从两个辐射检测器的输出信号中，鉴别出具有超过预定幅度的振幅的所有脉冲状振幅变化。 这些脉冲状幅度变化源自随机发生的，由材料中随机发生的不均匀性引起的材料流发射的辐射强度的局部，分散，短变化，例如在熔融射流中的气泡形式 玻璃。 来自上游检测器的输出信号中由材料流动不均匀性引起的脉冲振幅变化与来自下游检测器的输出信号中脉冲状振幅变化的发生之间的时间间隔 由材料流动相同的不均匀性引起的，被测量并用作测量材料流在检测器位置之间的行进时间，用于计算材料流的流速。 此外，材料流动的体积流量可以通过借助于光电二极管的线性阵列测量材料流的直径来确定，并且基于流速和直径的测量值计算体积流量 。