公开(公告)号：US4642777A

公开(公告)日：1987-02-10

申请号：US643258

申请日：1984-04-12

申请人： Lavern H. Schwanke

发明人： Lavern H. Schwanke

IPC分类号： G01S13/58 ,  G05D9/12 ,  G06G7/57 ,  G01R27/04 ,  G01S13/08 ,  G01S13/26

CPC分类号： G05D9/12 ,  G01S13/585

摘要： A method and apparatus provide for the determination of the rate-of-rise of the level of a liquid, such as molten metal in a mold, in a reliable, accurate, and flexible manner. Molten metal passes from a container through an adjustable valve in an orifice to a mold. A microwave generator is connected to a microwave antenna located above the mold for transmitting microwaves to the surface of the molten metal in the mold. A mixer/detector is operatively connected to the antenna, and a computer is operatively connected to the mixer/detector. The computer processes the mixed signal received from the mixer/detector after it is converted to a digital signal. This digital signal is responsive to the Doppler signal caused by change in the level of the metal in the mold. The rate-of-rise of the surface of the molten metal is calculated in response to the digital signal, and is displayed on a monitor. The slide gate is controlled to adjust the amount of molten metal flowing from the container to the mold to achieve a desired rate-of-rise. The computer uses various techniques, such as calculating rolling averages and optimizing maxima-to-maxima and minima-to-minima time interval calculations, to improve reliability in the presence of noise, spurious multiple reflections, and disturbances in the molten metal surface.

摘要翻译： 一种方法和装置以可靠，准确和灵活的方式确定液体（例如模具中的熔融金属）的液位升高速率。 熔融金属从容器通过孔中的可调节阀到模具。 微波发生器连接到位于模具上方的微波天线，用于将微波传输到模具中的熔融金属的表面。 混频器/检测器可操作地连接到天线，并且计算机可操作地连接到混频器/检测器。 计算机在将其转换为数字信号之后处理从混频器/检测器接收的混合信号。 该数字信号响应于模具中金属的水平变化引起的多普勒信号。 根据数字信号计算熔融金属表面的升高速率，并显示在监视器上。 控制滑动门以调节从容器流向模具的熔融金属的量以达到期望的升率。 计算机使用各种技术，例如计算滚动平均值和优化最大到最大值和最小到最小时间间隔计算，以提高在存在噪声，杂散多重反射和熔融金属表面中的干扰的可靠性。