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    IMPROVED DIFFUSION-TYPE GAS SAMPLE CHAMBER
    4.
    发明专利
    IMPROVED DIFFUSION-TYPE GAS SAMPLE CHAMBER 未知

    公开(公告)号：CA2119127C

    公开(公告)日：1997-01-21

    申请号：CA2119127

    申请日：1993-07-16

    Applicant: GAZTECH INT CORP

    Inventor： WONG JACOB Y

    IPC: G01N21/03 ,  G01N21/05 ,  G01N21/15 ,  G01N21/35 ,  G01N21/61 ,  G01N21/85 ,  G08B17/117 ,  G08B29/20

    Abstract: The improved sample chamber includes an elongated hollow tube (12) closed at one end (14) and having specularly-reflective inwardly facing surfaces(16). A source (26) of radiation and a detector (28) of radiation are mounted side by side in the open end of the hollow tube, both facing the closed end. A plurality of filtering apertures (20) are formed in the tube (12), and each aperture is covered by a sheet (22) of a semipermeable membrane that serves to prevent airborne particles larger than a predetermined size from entering the chamber while not interfering with the free diffusion of the gas to be measured into andout of the chamber. The use of an elongated hollow tube that is closed at one end results in no loss in the efficiency with which the radiation is conducted from the source to the detector while decreasing the external length of the chamber by 50 percent.

    Simple Fire Detector
    6.
    发明专利
    Simple Fire Detector 未知

    公开(公告)号：CA2058928A1

    公开(公告)日：1991-10-03

    申请号：CA2058928

    申请日：1991-03-29

    Applicant: GAZTECH INT CORP

    Inventor： WONG JACOB Y

    IPC: G08B17/10 ,  G01N21/03 ,  G01N33/00 ,  G08B17/103 ,  G08B17/117

    Abstract: A fire detector that responds more rapidly than the widely used smoke detectors senses increases in the concentration of carbon dioxide associated with a fire. The build-up of carbon dioxide is sensed by measuring the concomittant increase in the absorption of a beam of radiation whose wavelength is located at a strong absorption band of carbon dioxide. The device is considerably simplified by the use of a window to the sample chamber that is highly permeable to carbon dioxide but which keeps out particles of dust, smoke, oil, and water. This permits the fire detector to be built of very inexpensive materials.

    Improved diffusion-type gas sample chamber
    7.
    发明专利
    Improved diffusion-type gas sample chamber 未知

    公开(公告)号：AU657638B2

    公开(公告)日：1995-03-16

    申请号：AU4681993

    申请日：1993-07-19

    Applicant: GAZTECH INT CORP

    Inventor： WONG JACOB Y

    IPC: G01N21/03 ,  G01N21/05 ,  G01N21/15 ,  G01N21/35 ,  G01N21/61 ,  G01N21/85 ,  G08B17/117 ,  G08B29/20 ,  G01N1/00

    Abstract: The improved sample chamber includes an elongated hollow tube (12) closed at one end (14) and having specularly-reflective inwardly facing surfaces (16). A source (26) of radiation and a detector (28) of radiation are mounted side by side in the open end of the hollow tube, both facing the closed end. A plurality of filtering apertures (20) are formed in the tube (12), and each aperture is covered by a sheet (22) of a semipermeable membrane that serves to prevent airborne particles larger than a predetermined size from entering the chamber while not interfering with the free diffusion of the gas to be measured into and out of the chamber. The use of an elongated hollow tube that is closed at one end results in no loss in the efficiency with which the radiation is conducted from the source to the detector while decreasing the external length of the chamber by 50 percent.

    MULTI-CHANNEL GAS SAMPLE CHAMBER
    10.
    发明专利
    MULTI-CHANNEL GAS SAMPLE CHAMBER 未知

    公开(公告)号：CA2127106A1

    公开(公告)日：1993-07-08

    申请号：CA2127106

    申请日：1992-12-30

    Applicant: GAZTECH INT CORP

    Inventor： WONG JACOB Y

    IPC: G01N1/00 ,  G01N1/22 ,  G01N21/03 ,  G01N21/05 ,  G01N21/35 ,  G01N21/61 ,  G01N21/85 ,  G01N33/00 ,  G08B17/117 ,  G08B29/20

    Abstract: 2127106 9313401 PCTABS00024 A gas sample chamber (10) for use in a gas analyzer consists of an elongated hollow tube (21) having an inwardly-facing specularly-reflective surface (22) that permits the tube to function also as a light pipe for conducting radiation from a source (12) to a detector (14) through the sample gas. A number of apertures (24) in the wall of the elongated hollow tube permit the sample gas to enter and exit. Particles of smoke and dust of a size greater than 0.1 micron are kept out of the chamber by use of a semi-permeable membrane (28) that spans the apertures in the hollow tube. Condensation of the sample gas components is prevented by heating the sample chamber electrically to a temperature above the dew point of the component of concern. In one embodiment, more than one detector (40, 42, 44) are spaced around the periphery of the elongated hollow tube adjacent one end of it. In another embodiment, more than one detector (56, 58, 60) are spaced along the length of the elongated hollow tube.

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