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    • 3. 发明授权
    • Method for calibration of a spectroscopic sensor
    • 光谱传感器校准方法
    • US5835230A
    • 1998-11-10
    • US890926
    • 1997-07-10
    • James J. F. McAndrewRonald S. Inman
    • James J. F. McAndrewRonald S. Inman
    • G01J3/28G01J3/42G01N21/03G01N21/27G01N21/31G01N21/59
    • G01N21/276G01J3/42G01J2003/2866
    • A novel method for calibration of a spectroscopic sensor is provided. In the method, a spectroscopic system is provided. The system includes a measurement cell having one or more walls which at least partially enclose a sample region. The cell further includes a light entry port and a light exit port. The light entry port and the light exit port can be the same port or separate ports. Each of the ports contains a light transmissive window through which a light beam passes along an internal light path inside the measurement cell. The system further has an optical chamber which contains a light source for generating the light beam which passes through the light entry port into the cell, and a detector for measuring the light beam exiting the cell through the light exit port. The light beam passes along an external light path inside the optical chamber. In addition, a gas inlet is connected to the optical chamber. A calibration gas stream is introduced into the optical chamber. The calibration gas stream contains a calibrating gas species and a carrier gas. The calibrating gas species is present in the calibration gas stream in a known concentration. A spectroscopy measurement of the calibration gas stream is then performed. The method finds particular applicability in the calibration of an in-line spectroscopic sensor useful in the detection of molecules of interest in a semiconductor processing tool.
    • 提供了一种用于校准光谱传感器的新方法。 在该方法中,提供了光谱系统。 该系统包括具有至少部分地包围样品区域的一个或多个壁的测量单元。 电池还包括光入口和光出口。 光入口和光出口可以是相同的端口或单独的端口。 每个端口包含透光窗口,光束通过该透光窗口沿测量单元内部的内部光路传播。 该系统还具有光学室,该光学室包含用于产生通过光入口进入单元的光束的光源,以及用于测量通过光出口离开单元的光束的检测器。 光束通过光学室内的外部光路。 此外,气体入口连接到光学室。 校准气流被引入到光学室中。 校准气流包含校准气体种类和载气。 校正气体种类以已知浓度存在于校准气流中。 然后进行校准气流的光谱测量。 该方法在用于检测半导体加工工具中的分子的在线光谱传感器的校准中具有特别的适用性。