公开(公告)号：US06313638B1

公开(公告)日：2001-11-06

申请号：US09271612

申请日：1999-03-17

Applicant: Hong T. Sun ,  Peter C. Hsi

Inventor： Hong T. Sun ,  Peter C. Hsi

IPC: G01N2762

CPC classification number: G01N27/66 ,  H01J41/02

Abstract: A dual-channel photo-ionization detector (PID) and a method for calculating the gas concentration in the PID are disclosed. The PID includes a UV light source which produces a UV light to ionize a gas, first and second identical ion detectors for measuring first and second currents including ion, and a UV shield which differentially shields the ion detectors from the UV light. The differential shielding of the ion detectors enables the PID to differentiate between current caused by ions and current caused by the photoelectric effect of the UV light. The detector measures a concentration of the gas irrespective of a variation of an intensity of the UV light. A heater in the PID stabilizes the temperature for measurements and prevents condensation in the PID. The method includes: shielding the first ion detector from the UV light and exposing the second ion detector to the UV light; and deciding the concentration of the ionizable gases independent of an intensity of the UV light by comparing the first and second currents. In addition, the calculation of the gas concentration independent of the UV light intensity and a self-cleaning capability of the PID promote a construction of an integrated PID sensor module which is sealed to prevent a user from opening the sensor module. The sensor module ,including the UV light source, the ion sensors and the UV shield in a single housing, easily plugs into the socket in a structure including the remainder PID.

Abstract translation: 公开了一种双通道光电离检测器（PID）和用于计算PID中的气体浓度的方法。 PID包括产生UV光以使气体离子化的UV光源，用于测量包括离子的第一和第二电流的第一和第二相同的离子检测器以及差分地屏蔽离子检测器与UV光的UV屏蔽。 离子检测器的差分屏蔽使PID能够区分由紫外光的光电效应引起的离子和电流引起的电流。 检测器测量气体的浓度，而不管UV光的强度如何变化。 PID中的加热器可稳定测量温度，并防止PID中的冷凝。 该方法包括：将第一离子检测器与UV光屏蔽，并将第二离子检测器暴露于UV光; 并且通过比较第一和第二电流来决定独立于UV光的强度的可电离气体的浓度。 另外，独立于UV光强度的气体浓度的计算和PID的自清洁能力促进了密封的集成PID传感器模块的结构，以防止用户打开传感器模块。 传感器模块，包括UV光源，离子传感器和UV屏蔽在单个外壳中，可以以包括剩余PID的结构轻松插入插座。

公开(公告)号：US3535576A

公开(公告)日：1970-10-20

申请号：US3535576D

申请日：1968-11-21

Applicant: HONEYWELL INC

Inventor： SKILDUM JOHN D

IPC: G01N27/66 ,  H01J41/02 ,  H01J41/06 ,  H01J61/40 ,  H01K1/26

CPC classification number: H01J41/02 ,  G01N27/66 ,  H01J41/06

公开(公告)号：US3363451A

公开(公告)日：1968-01-16

申请号：US40590364

申请日：1964-10-23

Applicant: GEN ELECTRIC

Inventor： ROBERTS JOHN A

IPC: G01M3/20 ,  G01M3/22 ,  H01J41/02 ,  H01J41/04

CPC classification number: G01M3/20 ,  G01M3/226 ,  H01J41/02 ,  H01J41/04

公开(公告)号：US3139754A

公开(公告)日：1964-07-07

申请号：US11742261

申请日：1961-06-15

Applicant: SYLVANIA ELECTRIC PROD

Inventor： DORE BURNELL V

IPC: H01J41/02

CPC classification number: H01J41/02

公开(公告)号：US2904749A

公开(公告)日：1959-09-15

申请号：US65228957

申请日：1957-04-11

Applicant: PHILIPS CORP

Inventor： JOHAN SCHUTTEN

IPC: G01L21/00 ,  H01J41/02

CPC classification number: H01J41/02 ,  G01L21/00

公开(公告)号：US2820946A

公开(公告)日：1958-01-21

申请号：US40732154

申请日：1954-02-01

Applicant: CONS ELECTRODYNAMICS CORP

Inventor： ROBINSON CHARLES F

IPC: G01L21/00 ,  H01J41/02

CPC classification number: H01J41/02 ,  G01L21/00

公开(公告)号：US2766386A

公开(公告)日：1956-10-09

申请号：US37158153

申请日：1953-07-31

Applicant: RALLS JOHN W

Inventor： RALLS JOHN W

IPC: G01T1/185 ,  H01J41/02

CPC classification number: H01J41/02 ,  G01T1/185