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    • 7. 发明申请
    • METROLOGY METHOD FOR TRANSIENT GAS FLOW
    • 瞬态气体流量计方法
    • US20140343875A1
    • 2014-11-20
    • US13896108
    • 2013-05-16
    • Lam Research Corporation
    • Evangelos SpyropoulosIqbal Shareef
    • G01F1/34
    • G01F1/34B01J2219/00216G01F25/0007G01F25/0038G01F25/0092
    • A method of calculating a transient flow rate of a flowed process gas comprises flowing process gas through a mass flow controller into a chamber of known volume and measuring successive data sample points which include pressure data, temperature data, and a time value for each successive data sample point. Groups of successive data sample points are identified wherein each group shares one or more successive data sample points with another group, and ratio values are calculated for each of the successive data sample points wherein each ratio value is a ratio between the pressure data and a product of temperature and gas compressibility data for each respective time value. A line of best fit of the ratio values is determined within at least one group, and then the transient flow rate of the flowed process gas is calculated using a pressure rate of rise technique wherein the pressure rate of rise technique utilizes a ratio value determined from the line of best fit for at least one time value within the at least one group.
    • 一种计算流动工艺气体的瞬态流量的方法包括使工艺气体通过质量流量控制器流入已知体积的腔室并测量连续的数据采样点,其包括压力数据,温度数据和每个连续数据的时间值 采样点。 识别连续数据采样点的组,其中每个组与另一组共享一个或多个连续的数据采样点,并且为每个连续数据采样点计算每个连续数据采样点的比值,其中每个比值是压力数据和乘积之间的比率 的每个时间值的温度和气体压缩性数据。 在至少一组内确定比值的最佳拟合线,然后使用上升技术的压力比计算流动过程气体的瞬时流量,其中上升压力的技术利用从 该线最适合至少一个组内的至少一个时间值。