公开(公告)号：JP2003066008A

公开(公告)日：2003-03-05

申请号：JP2002155806

申请日：2002-05-29

Applicant: Rae Systems Inc ,  ラエ・システムズ・インコーポレイテッド

Inventor： SUN HONG T ,  HSI PETER C

IPC: G01N27/64 ,  G01N27/66 ,  G01N33/00 ,  H01J41/02

CPC classification number: G01N33/0026 ,  G01N27/66 ,  G01N33/0029 ,  G01N33/0047 ,  H01J41/02

Abstract: PROBLEM TO BE SOLVED: To provide a photoionization detector (PID) capable of simultaneously carrying out measurement and self-cleaning.
SOLUTION: This photoionization detector PID has a microprocessor (MP), a first gas detecting unit (DUI), and a second gas detecting unit (DU2). The MP controls the DU1 and the DU2, and it always streams environmental gas (EG) through one ionization chamber (ICh) and detains the EG in the ICh of the other DU. A UV lamp (UV) converts oxygen in the EG to ozone, and it removes contaminated substances in the ICh. When the PID has only one DU, the MP controls the DU, and intermittently interrupts the flow of the EG of the ICh. As for measurement of real time self-cleaning and concentration of volatile gas (VG) by the PID, the PID measures the concentration of the VG by streaming the EG through the ICh of the DU1, and the EG passing through the ICh of the DU2 is hermetically sealed in the inside to be used for self- cleaning. The UV converts oxygen contained in the EG in the ICh of the DU2 to ozone, and removes contaminated substances in the ICh of the DU2.
COPYRIGHT: (C)2003,JPO

Abstract translation: 要解决的问题：提供能够同时进行测量和自清洁的光电离检测器（PID）。 解决方案：该光电离检测器PID具有微处理器（MP），第一气体检测单元（DUI）和第二气体检测单元（DU2）。 MP控制DU1和DU2，它总是通过一个电离室（ICh）流出环境气体（EG），并扣留另一个DU的ICh中的EG。 UV灯（UV）将EG中的氧气转化为臭氧，并清除ICh中的污染物质。 当PID只有一个DU时，MP控制DU，间歇地中断ICh的EG的流动。 对于PID的实时自清洁和挥发性气体浓度的测量，PID通过DU1的ICh流动EG测量VG的浓度，EG通过DU2的ICh 密封在内部用于自洁。 UV将DU2的ICh中的EG中所含的氧转化为臭氧，并除去DU2的ICh中的污染物质。

公开(公告)号：JP4053817B2

公开(公告)日：2008-02-27

申请号：JP2002155806

申请日：2002-05-29

Applicant: ラエ・システムズ・インコーポレイテッドRae Systems,Inc.

Inventor： ピーター・シー・シー ,  ホング・ティー・スン

IPC: G01N27/64 ,  G01N27/66 ,  G01N33/00 ,  H01J41/02

CPC classification number: G01N33/0026 ,  G01N27/66 ,  G01N33/0029 ,  G01N33/0047 ,  H01J41/02

公开(公告)号：AU6785694A

公开(公告)日：1994-12-12

申请号：AU6785694

申请日：1994-05-06

Applicant: RAE SYSTEMS INC

Inventor： HSI PETER C

IPC: G01N27/66 ,  G01N33/00

Abstract: A photo-ionization detector utilizes an ultraviolet (UV) lamp for detecting and measuring the concentration of volatile gases flowing between closely spaced parallel electrodes. One of the electrodes is made of mesh to allow photons to pass into the space between the electrodes to ionize the volatile gases between the electrodes. The detector also incorporates an improved ionization chamber. In other embodiments, a plurality of gas discharge lamps, each generating a different photon energy, may be placed adjacent to a plurality of closely spaced electrodes, all electrodes in one ionization chamber, to detect and measure different types of volatile gases that may exist.

公开(公告)号：DE69942181D1

公开(公告)日：2010-05-06

申请号：DE69942181

申请日：1999-10-20

Applicant: RAE SYSTEMS INC

Inventor： SUN HONG T ,  HSI PETER C

IPC: G01N27/66 ,  G01N30/64 ,  G01N33/00 ,  H01J41/02

公开(公告)号：DE60040298D1

公开(公告)日：2008-10-30

申请号：DE60040298

申请日：2000-09-18

Applicant: RAE SYSTEMS INC

Inventor： YANG WENJUN ,  HSI PETER C

IPC: B01D59/44 ,  G01N27/64 ,  H01J49/00

Abstract: A photo-ionization detector (PID) employs combinations of ion mobility spectrometry, ionization energy discrimination, and chemical filtering to identify the presence and quantity of specific gases. One such PID introduces a gas sample into an ionization chamber at an end of a drift tube. UV light from a PI source ionizes ionizable molecules contained in the gas sample. The PI source includes either multiple UV lamps, each having a specific energy level for discriminating between potential constituents of the gas sample or one multiple-energy level UV lamp with different light bandwidth window zones and a zone selector. A shutter grid separates the ionization chamber from the drift tube. When the shutter grid is open, an electric field in the drift tube attracts ions that travel against the flow of a drift gas until a collector electrode at the end of the drift tube captures the ions. A time required for the ions to travel the length of the drift tube is characteristic of the type of ion. Thin mesh electrodes in the drift tube sustain a uniform electric field so that groups of ions traveling down the drift tube to create well defined current pulses at the collector electrode.

公开(公告)号：AU6828194A

公开(公告)日：1994-12-12

申请号：AU6828194

申请日：1994-05-06

Applicant: RAE SYSTEMS INC

Inventor： HSI PETER C

IPC: H01J65/04

公开(公告)号：EP3832298A1

公开(公告)日：2021-06-09

申请号：EP20211117.5

申请日：2020-12-01

Applicant: Rae Systems, Inc.

Inventor： MU, Qinghui ,  JIAN, Jianglin ,  LIANG, Feng ,  LIU, Ling ,  WEI, Na

IPC: G01N27/404 ,  G01N33/00

Abstract: An electrochemical gas sensor assembly (EGS) includes a first sensor cover and a second sensor cover. The first sensor cover is disposed on a first end of the sensor assembly and the second sensor cover is disposed on a second end of the sensor assembly. The first sensor cover defines a first capillary and the second sensor cover defines a second capillary therethrough. The sensor assembly further includes a first sensing unit, a second sensing unit, and a filter. The first sensing unit and the second sensing unit are disposed between the first sensor cover and the second sensor cover. In some example embodiments, the filter (e.g. KMnO4) is reactive to a target gas and thereby prevents an inflow of the target gas through the second capillary into the sensor assembly. The sensor assembly can be used for the accurate determination of a target gas, irrespective of interference in sensing output. The cause of interference can be due to environmental parameters such as temperature and humidity within the EGS assembly to which components of the EGS are exposed.

公开(公告)号：EP1243921B1

公开(公告)日：2010-03-24

申请号：EP02011787.5

申请日：1999-10-20

Applicant: RAE SYSTEMS, INC.

Inventor： Sun, Hong T. ,  Hsi, Peter C.

IPC: G01N27/66 ,  G01N30/64

CPC classification number: G01N33/0029 ,  G01N27/66 ,  G01N33/0047 ,  H01J41/02

公开(公告)号：EP1243921A2

公开(公告)日：2002-09-25

申请号：EP02011787.5

申请日：1999-10-20

Applicant: RAE SYSTEMS, INC.

Inventor： Sun, Hong T. ,  Hsi, Peter C.

IPC: G01N27/66

CPC classification number: G01N33/0029 ,  G01N27/66 ,  G01N33/0047 ,  H01J41/02

Abstract: The PID includes an ultraviolet lamp for transmitting UV light through an optical window into an ionization chamber to ionize volatile gases. The UV lamp comprises a sealed envelope containing inert gases and a pair of driving electrodes disposed outside the sealed envelope to induce a glow discharge of the inert gases. An ion detector is disposed in the ionization chamber to detect the produced ions.
During operation of the PID, the effectiveness decreases due to contamination formed in the ionization chamber. To remove the contamination, the pump is turned off while maintaining the transmission of the UV lamp. Thus the UV light creates an ozone discharge which accumulates in the ionization chamber. Ozone is a strong oxidant which etches and removes the contamination from the ionization chamber.

Abstract translation: PID包括紫外线灯，用于将UV光通过光学窗口传输到电离室中以电离挥发性气体。 UV灯包括含有惰性气体的密封外壳和设置在密封外壳外部的一对驱动电极，以引起惰性气体的辉光放电。 离子检测器设置在电离室中以检测所产生的离子。 在PID运行期间，由于电离室中形成的污染，效果会降低。 为了清除污染物，在保持UV灯的传输的同时关闭泵。 因此，UV光产生积聚在电离室中的臭氧排放物。 臭氧是一种强氧化剂，可以蚀刻和去除电离室的污染物。

公开(公告)号：EP2906936A1

公开(公告)日：2015-08-19

申请号：EP13843563.1

申请日：2013-10-04

Applicant: Rae Systems, Inc.

Inventor： SOUNDARRAJAN, Prabhu ,  HSI, Peter

IPC: G01N27/62 ,  G01N31/22

CPC classification number: G01N27/66

Abstract: An integrated sensor (100) of volatile organic gas can include a photoionization detector or PID (110) and one or more additional detectors (112) such as an infrared detector, a catalytic combustion detector, or an electrochemical detector. One embodiment (600) includes a methane detector (612) that allows correction of the PID measurements for the interference of methane with the PID (110) and/or allows a combination of measurements of the additional detectors (612, 616) to measure a total hydrocarbon concentration. A further additional detector (114) of non-hydrocarbon quenching gases such as carbon dioxide may also be used in correction of the PID measurements.