公开(公告)号：US5533408A

公开(公告)日：1996-07-09

申请号：US361941

申请日：1994-12-22

申请人： Daniel Oldenziel ,  Marcel Griessmann

发明人： Daniel Oldenziel ,  Marcel Griessmann

IPC分类号： G01F1/66 ,  G01F1/708 ,  G01F1/712 ,  G01F1/00

CPC分类号： G01F1/7082 ,  G01F1/662 ,  G01F1/667 ,  G01F1/712

摘要： To permit this flowmeter to automatically operate either on one measurement principle or on another depending on a selectable foreign-particle content of the fluid, it has a first pair of ultrasonic transducers, one of which is operated as a transmitting transducer and the other as a receiving transducer or vice versa, and which are mounted on the outside surface of a fluid-carrying pipe and separated by a given distance in a direction parallel to the axis of the pipe, with the angle between the direction of the ultrasound and the pipe axis differing from 90.degree.. There is provided a second pair of ultrasonic transducers which are operated simultaneously as transmitting transducers or receiving transducers and are mounted on the outside surface of the pipe and separated by a given distance in a direction parallel to the axis of the pipe, the angle between the direction of the ultrasound and the pipe axis being less than or equal to 90.degree.. Driver/evaluation electronics either supply the ultrasonic transducers of the first pair successively with a pulse burst, measure the travel time in the downstream and upstream directions of the ultrasonic signals propagating through the fluid and reflected at the opposite inside surface of the pipe, and determine volumetric flow rate therefrom, or supply the ultrasonic transducers of the second pair with the pulse burst simultaneously, measure the time difference between signals reflected at foreign particles in the fluid and received by those ultrasonic transducers using correlation techniques, and determine volumetric flow rate therefrom. Changeover electronics with a threshold switch switch the driver/evaluation electronics to the travel-time or correlation mode in response to the output of the threshold switch.

摘要翻译： 为了允许该流量计根据一种测量原理或另一种测量原理自动运行，这取决于流体的可选择的外来颗粒含量，它具有第一对超声换能器，其中一个超声换能器作为发射换能器操作，另一个作为 接收换能器，反之亦然，并且其安装在流体输送管的外表面上，并且在平行于管的轴线的方向上与给定距离方向分开一定距离，超声波和管轴之间的角度 不同于90°。 提供了第二对超声波换能器，其同时作为发射换能器或接收换能器操作并且安装在管的外表面上并且在平行于管的轴线的方向上分开给定的距离， 超声波和管轴的方向小于或等于90°。 驱动器/评估电子设备以脉冲串连续提供第一对的超声换能器，测量在通过流体传播并在管的相对内表面反射的超声信号的下游和上游方向上的行进时间，并且确定 或者用脉冲串同时提供第二对的超声波换能器，测量在流体中异物和由这些超声换能器使用相关技术接收的信号之间的时间差，并从其确定体积流量。 通过阈值切换切换电子设备，可以根据阈值开关的输出，将驱动器/评估电路切换到行驶时间或相关模式。