公开(公告)号：AU2010254595A1

公开(公告)日：2011-01-13

申请号：AU2010254595

申请日：2010-12-06

Applicant: XTRALIS TECHNOLOGIES LTD

Inventor： ALEXANDER BRIAN ,  BOETTGER KARL ,  KNOX RON ,  MEIKLE PETER

IPC: G08B17/103 ,  G08B17/107

Abstract: A smoke detector (10) is disclosed which uses a beam of radiation such as a laser (16), to monitor a region, such a room (12). A camera (14) is used to capture images of part of the room (12), including a path of the laser beam. Particles in the laser beam scatter light (30), and this is captured by the camera (14) for analysis. A processor (20) extracts data relating to the scattered light (30) to determine the density of particles in the beam, to determine the level of smoke in the region. The laser may have a modulated output (38) so that images captured without the laser can be used as a reference point and compared to images taken with the laser on, to assist in determining the level of scattered light (30) compared to ambient light. Filters (24, 26) may be used to decrease signals generated from background light.

公开(公告)号：CA2858059A1

公开(公告)日：2004-11-25

申请号：CA2858059

申请日：2004-05-14

Applicant: XTRALIS TECHNOLOGIES LTD

Inventor： KNOX RON ,  BOETTGER KARL ,  MEIKLE PETER ,  ALEXANDER BRIAN

IPC: G01N15/00 ,  G01N15/02 ,  G08B17/103 ,  G08B17/107

Abstract: A smoke detector (10) is disclosed which uses a beam of radiation such as a laser (16), to monitor a region, such a room (12). A camera (14) is used to capture images of part of the room (12), including a path of the laser beam. Particles in the laser beam scatter light (30), and this is captured by the camera (14) for analysis. A processor (20) extracts data relating to the scattered light (30) to determine the density of particles in the beam, to determine the level of smoke in the region. The laser may have a modulated output (38) so that images captured without the laser can be used as a reference point and compared to images taken with the laser on, to assist in determining the level of scattered light (30) compared to ambient light. Filters (24, 26) may be used to decrease signals generated from background light.

公开(公告)号：CA2858059C

公开(公告)日：2017-11-07

申请号：CA2858059

申请日：2004-05-14

Applicant: XTRALIS TECHNOLOGIES LTD

Inventor： KNOX RON ,  BOETTGER KARL ,  MEIKLE PETER ,  ALEXANDER BRIAN

IPC: G01N15/00 ,  G01N15/02 ,  G08B17/103 ,  G08B17/107

Abstract: A smoke detector is disclosed which uses a beam of radiation such as a laser, to monitor a region, such as a room. A camera is used to capture images of part of the room, including a path of the laser beam. Particles in the laser beam scatter light, and this is captured by the camera for analysis. A processor extracts data relating to the scattered light to determine the density of particles in the beam, to determine the level of smoke in the region. The laser may have a modulated output so that images captured without the laser can be used as a reference point and compared to images taken with the laser on, to assist in determining the level of scattered light compared to ambient light. Filters may be used to decrease signals generated from background light.