公开(公告)号：EP2941641B1

公开(公告)日：2017-02-22

申请号：EP14718221.6

申请日：2014-03-10

申请人： Novelis, Inc.

发明人： HILDENBRANDT, Leslie Calvin ,  THORNTON, Gary

IPC分类号： G01N27/416 ,  H03K5/125 ,  G01N33/20

CPC分类号： H03K5/125 ,  G01N27/4161 ,  G01N33/206

公开(公告)号：EP2948752A1

公开(公告)日：2015-12-02

申请号：EP14714522.1

申请日：2014-03-10

申请人： Novelis, Inc.

发明人： THORNTON, Gary

IPC分类号： G01N15/02 ,  G01N15/12 ,  G01N33/20

CPC分类号： G01N27/07 ,  G01N15/0656 ,  G01N27/06 ,  G01N33/206 ,  G01N2015/0053

摘要： Methods and apparatus for measuring the cleanliness of molten metals. Direct current is passed between electrodes through molten metal advancing through a passage in an electrically resistive wall. A voltage signal is analyzed for the presence of solid generally non-metallic inclusions in the metal. Direct current is supplied by one or more ultra-capacitors and the decay in discharge voltage of the capacitor(s) is compensated for by passing the current from each capacitor through a resistor ladder network circuit having resistors connected in parallel. Individual resistors are switched on or off in a sequence effective to change the resistance of the circuit and maintain the current within a predetermined range. Heat generation and noise pick-up are minimized by maintaining a low discharge voltage and measurement current while using FETs only in the fully ON or OFF conditions to switch the resistors into or out of the circuits.

摘要翻译： 用于测量熔融金属清洁度的方法和设备。 直流电流通过熔融金属通过电阻壁中的通道进入电极之间。 分析电压信号是否存在金属中固体一般非金属夹杂物。 通过一个或多个超级电容器提供直流电流，并且通过使来自每个电容器的电流通过具有并联连接的电阻器的电阻梯形网络电路来补偿电容器的放电电压的衰减。 单个电阻器以有效改变电路电阻并将电流保持在预定范围内的顺序被接通或断开。 通过保持低放电电压和测量电流，在仅在完全ON或OFF条件下使用FET才能将电阻器切换到电路中或从电路中切换，从而使发热和噪声拾取最小化。

公开(公告)号：EP2941641A1

公开(公告)日：2015-11-11

申请号：EP14718221.6

申请日：2014-03-10

申请人： Novelis, Inc.

发明人： HILDENBRANDT, Leslie Calvin ,  THORNTON, Gary

IPC分类号： G01N33/20

CPC分类号： H03K5/125 ,  G01N27/4161 ,  G01N33/206

摘要： Methods and apparatus for measuring the cleanliness of molten metal. Direct current is passed through molten metal advancing through a passage. A voltage signal is analyzed for the presence of solid generally non-metallic inclusions in the metal. A method includes sampling digital data of the voltage signal to generate data samples; updating a delayed running average of the data samples to establish a baseline for identifying sudden changes in amplitude of the data samples; determining a threshold by adding a prescribed value to the baseline; identifying a possible inclusion when a significant number of data samples exceeds the threshold; storing a maximum count as the data samples using peak detection until a prescribed number of the data samples fall below the threshold; and comparing a parameter of the possible inclusion with a lookup table to categorize the possible inclusion as either (i) an actual inclusion or (ii) noise.

摘要翻译： 的方法和装置，用于测量熔化金属的清洁度。 直流电流通过的熔融金属通过通道前进通过。 的电压信号被分析为固体基因反弹的非金属夹杂物的在金属存在下进行。 一种方法包括：采样所述电压信号，以产生数据样本的数字数据; 更新所述数据样本的延迟运行平均值，以建立基线用于识别的数据样本的振幅突然变化; 确定性采矿通过将规定值与基线阈值; 识别可能包含当数据样本的一个显著数超过阈值; 存储最大计数如使用峰值检测，直到下降到低于阈值的数据样本的规定数量的数据样本; 和可能的夹杂物的参数比较的查找表进行分类可能列入作为（ⅰ）的实际夹杂物或（ii）的噪声。