公开(公告)号：US3742343A

公开(公告)日：1973-06-26

申请号：US3742343D

申请日：1970-10-29

Applicant: PHILIPS CORP

Inventor： PITTAWAY L

IPC: G01L21/32 ,  H01J41/04 ,  H01J41/06 ,  G01N27/00 ,  G01N27/62

CPC classification number: H01J41/06 ,  H01J41/04

Abstract: An ion guage comprising a conducting cylinder closed at one end; a pair of cathodes within the cylinder; a cylindrical grid between the cathodes and having a wire mesh peripheral walls relatively transparent to electrons, which grid is bounded at one end by a wire mesh wall and at the opposite end nearer the closed end of the conducting cylinder by an apertured metal wall; means adjacent to the aperture for extracting and converging ions, and an electrode for collecting extracted ions.