Gas Gauge Compatible With Vacuum Environments
    3.
    发明申请
    Gas Gauge Compatible With Vacuum Environments 有权
    气体表与真空环境兼容

    公开(公告)号:US20140096614A1

    公开(公告)日:2014-04-10

    申请号:US14102667

    申请日:2013-12-11

    申请人: ASML Holding N.V.

    IPC分类号: G01L13/02

    摘要: In one embodiment of the present invention, there is provided a gas gauge for use in a vacuum environment having a measurement gas flow channel. The gas gauge may comprise a measurement nozzle in the measurement gas flow channel. The measurement nozzle may be configured to operate at a sonically choked flow condition of a volumetric flow being sourced from a gas supply coupled to the measurement gas flow channel. The gas gauge may further comprise a pressure sensor operatively coupled to the measurement gas flow channel downstream from the sonically choked flow condition of the volumetric flow to measure a differential pressure of the volumetric flow for providing an indication of a gap between a distal end of the measurement nozzle and a target surface proximal thereto.

    摘要翻译: 在本发明的一个实施例中,提供一种用于具有测量气体流动通道的真空环境中的气量计。 气量计可以包括测量气体流动通道中的测量喷嘴。 测量喷嘴可以被配置为在来自耦合到测量气体流动通道的气体源的体积流的声波扼流流动条件下操作。 气量计还可以包括压力传感器,该压力传感器可操作地耦合到测量气体流动通道的下游,该体积流量的声波扼流流动条件以测量体积流量的压力差,以便提供体积流动的远端之间的间隙的指示 测量喷嘴和靠近其的目标表面。