公开(公告)号：US4577490A

公开(公告)日：1986-03-25

申请号：US647547

申请日：1984-09-06

申请人： David J. Bray ,  Peter E. Johnson ,  Peter E. G. Marshall ,  Francis R. Piper ,  Iain H. Murdoch

发明人： David J. Bray ,  Peter E. Johnson ,  Peter E. G. Marshall ,  Francis R. Piper ,  Iain H. Murdoch

IPC分类号： G01M3/04 ,  G01M3/20

CPC分类号： G01M3/205 ,  G01M3/04

摘要： A leak detector comprises a detector head which is to be scanned across a surface to detect a signal gas eminating from the surface. The opposite side of the surface from the head is supplied with a signal gas under pressure so that signal gas passes through leaks in the surface. Detection of signal gas by the head should then constitute detection of a leak. A curtain 1 of barrier gas is provided around a sample inlet 2 to protect the inlet from spurious signal gas. Orifices 36 provide narrow high velocity jets 38 which impinge on the surface S within curtain 1 and break up jets such as 34 of signal gas which escape under the curtain 1 without allowing the signal gas to reach the sample inlet.

摘要翻译： 检漏器包括检测器头，扫描头将被扫过表面以检测从表面排出的信号气体。 与头部相反的一侧，在压力下供给信号气体，使信号气体通过表面的泄漏。 头部的信号气体检测应该构成检测泄漏。 在样品入口2周围设置阻挡气体帘1，以保护入口免受杂散信号气体的侵害。 孔板36提供窄的高速射流38，其冲击窗帘1内的表面S，并且分解诸如信号气体34的射流，其在幕1下方逸出，而不允许信号气体到达样品入口。