公开(公告)号：EP0634009A4

公开(公告)日：1996-01-03

申请号：EP93917242

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

CPC classification number: G01N21/3518 ,  G01N21/031 ,  G01N21/0332 ,  G01N21/15 ,  G01N21/3504 ,  G01N21/61 ,  G01N2021/0314 ,  G01N2021/0385 ,  G01N2021/158 ,  G01N2021/8585 ,  G01N2201/0228 ,  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 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.

公开(公告)号：EP0568549A4

公开(公告)日：1994-11-17

申请号：EP92901709

申请日：1991-11-25

Applicant: GAZTECH INT CORP

Inventor： WONG JACOB Y

IPC: G01N21/35 ,  G01J1/16 ,  G01J1/18 ,  G01N1/00 ,  G01N1/22 ,  G01N21/03 ,  G01N21/05 ,  G01N21/25 ,  G01N21/31 ,  G01N21/61 ,  G08B17/10 ,  G08B17/117 ,  G08B29/20

CPC classification number: G01N21/0303 ,  G01J2001/161 ,  G01J2001/182 ,  G01N1/2258 ,  G01N21/0332 ,  G01N21/05 ,  G01N21/255 ,  G01N21/314 ,  G01N21/3504 ,  G01N2001/2261 ,  G01N2021/0321 ,  G01N2021/0385 ,  G01N2021/052 ,  G01N2201/0228 ,  G01N2201/06186 ,  G01N2201/0696 ,  G08B17/117 ,  G08B29/20

Abstract: 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 (20) to a detector (16) 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.

公开(公告)号：EP0619879A4

公开(公告)日：1994-11-02

申请号：EP93902862

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

CPC classification number: G01N1/2258 ,  G01N21/0332 ,  G01N21/05 ,  G01N21/3504 ,  G01N33/0011 ,  G01N33/0016 ,  G01N33/0031 ,  G01N2001/2261 ,  G01N2021/0321 ,  G01N2021/0385 ,  G01N2021/052 ,  G01N2021/158 ,  G01N2021/8585 ,  G01N2201/0228 ,  G01N2201/066 ,  G08B17/117 ,  G08B29/20

Abstract: 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.