-
1.发明授权Detection of vacuum leaks by gas ionization method and apparatus providing decreased vacuum recovery time 失效通过气体浓度检测方法检测真空泄漏和提供降低真空回收时间的装置
公开(公告)号：US3581195A
公开(公告)日：1971-05-25
申请号：US3581195D
申请日：1968-06-10
Applicant: VARIAN ASSOCIATES
Inventor： JEPSEN ROBERT L
CPC classification number: G01M3/202
Abstract: A vacuum leak detecting method and apparatus is disclosed. An evacuated vacuum envelope structure to be tested for leaks is probed exteriorly with a jet of probe gas, such as helium. A certain fractional proportion of probe gas constituent which leaks through the probed vacuum envelope structure is ionized by a leak detector apparatus connected in gas communication with the structure being tested. The ionized probe gas constituent is collected to produce an ion current signal. The ion current signal is monitored to obtain a measure of the partial pressure of the probe gas constituent for detecting leaks. The fractional proportion of the probe gas which is ionized is varied inversely with the partial pressure of the probe gas constituent, whereby reemission of ionically pumped gas within the pressure measuring system is minimized, in use, to decrease the recovery time of the leak detector in its high sensitivity range. In one embodiment of the present invention, a comparator circuit is provided for comparing the amplitude of the ion current signal with a reference signal to derive a control signal for controlling the intensity of a ionizing bema of electrons utilized to ionize the probe gas constituent.
-
公开(公告)号：US3150817A
公开(公告)日：1964-09-29
申请号：US10028461
申请日：1961-04-03
Applicant: VARIAN ASSOCIATES
Inventor： JEPSEN ROBERT L , LLOYD WILLIAM A , ACKLEY JAMES W
IPC: H01J41/12
CPC classification number: H01J41/12
-
公开(公告)号：US3117247A
公开(公告)日：1964-01-07
申请号：US11335661
申请日：1961-05-29
Applicant: VARIAN ASSOCIATES
Inventor： JEPSEN ROBERT L
IPC: H01J41/20
CPC classification number: H01J41/20
-
公开(公告)号：US3376455A
公开(公告)日：1968-04-02
申请号：US53063866
申请日：1966-02-28
Applicant: VARIAN ASSOCIATES
Inventor： JEPSEN ROBERT L
IPC: H01J41/20
CPC classification number: H01J41/20
-
公开(公告)号：US3331975A
公开(公告)日：1967-07-18
申请号：US43399265
申请日：1965-02-19
Applicant: VARIAN ASSOCIATES
Inventor： JEPSEN ROBERT L
IPC: H01J41/20
CPC classification number: H01J41/20
-
Patent Agency Ranking
公开(公告)号：US3101431A
公开(公告)日：1963-08-20
申请号：US11325861
申请日：1961-05-29
Applicant: VARIAN ASSOCIATES
Inventor： JEPSEN ROBERT L , FRANCIS ARTHUR B
IPC: H01J41/20
CPC classification number: H01J41/20
-
公开(公告)号：US2996639A
公开(公告)日：1961-08-15
申请号：US80599959
申请日：1959-04-13
Applicant: VARIAN ASSOCIATES
Inventor： JEPSEN ROBERT L
-
8.发明授权Vacuum gauge having separate electron collecting and electron accelerating electrodes 失效真空计具有分离的电子收集和电子加速电极
公开(公告)号：US3387175A
公开(公告)日：1968-06-04
申请号：US43745665
申请日：1965-03-05
Applicant: VARIAN ASSOCIATES
Inventor： LLOYD WILLIAM A , JEPSEN ROBERT L
-
公开(公告)号：US3115297A
公开(公告)日：1963-12-24
申请号：US3580760
申请日：1960-06-13
Applicant: VARIAN ASSOCIATES
Inventor： LLOYD WILLIAM A , JEPSEN ROBERT L
IPC: H01J41/20
CPC classification number: H01J41/20
-
公开(公告)号：US3028519A
公开(公告)日：1962-04-03
申请号：US78449459
申请日：1959-01-02
Applicant: VARIAN ASSOCIATES
Inventor： JEPSEN ROBERT L , WALTER RICHARD L
-
-
-
-
-
-
-
-
-
Search Results
27
records
(took 0.012 seconds)
