Patents Assigned to Vision Fire & Security Pty Ltd
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Publication number: 20130170705Abstract: A smoke detecting method which uses a beam of radiation such as a laser (16), to monitor a region, such as 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 tuned “on” can be used as a reference point and compared to images taken with the laser turned “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.Type: ApplicationFiled: February 25, 2013Publication date: July 4, 2013Applicant: VISION FIRE & SECURITY PTY LTDInventor: Vision Fire & Security PTY Ltd
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Patent number: 8412481Abstract: A method for determining an operational condition of a particle detection system including at least one sample inlet for receiving a sample flow from a monitored region. The method includes the step of conducting an upstream measurement of a flow rate through the at least one sample inlet.Type: GrantFiled: September 24, 2004Date of Patent: April 2, 2013Assignee: Vision Fire & Security Pty LtdInventor: Ron Knox
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Patent number: 8406471Abstract: A smoke detecting method which uses a beam of radiation such as a laser (16), to monitor a region, such as 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 tuned “on” can be used as a reference point and compared to images taken with the laser turned “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.Type: GrantFiled: June 20, 2011Date of Patent: March 26, 2013Assignee: Vision Fire & Security Pty LtdInventors: Ron Knox, Karl Boettger, Peter Meikle, Brian Alexander
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Publication number: 20130013227Abstract: A method of detecting one or more blocked sampling holes in a pipe of an aspirated smoke detector system. The method includes ascertaining the base flow of fluid through a particle detector using a flow sensor; monitoring subsequent flow through the particle detector; comparing the subsequent flow with the base flow; and indicating a fault if the difference between the base flow and the subsequent flow exceeds a predetermined threshold.Type: ApplicationFiled: July 9, 2012Publication date: January 10, 2013Applicant: VISION FIRE & SECURITY PTY LTDInventors: KEMAL AJAY, Arjun Vinoo Caprihan, Michael Rezny
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Patent number: 8314710Abstract: The present invention relates to a system for determining particle transmittance Tx of a filter for use with a particle detection system to provide a filter warning for aspirated particle detection systems by detecting a level of first particles having a size indicative of smoke particles and which pass through the detection system; determining an integrated smoke hours value by integrating the detected level of first particles over time; estimating the smoke particle transmittance Tx of the filter by applying a predetermined weighting operation to the integrated smoke hours value. An empirical measure of a filter's particle transmittance Tx, due to at least first particles having a size indicative of smoke particles may be achieved by way of integrating a level of such first particles passing through a particle detection system over time to determine the proportion of smoke particles arrested by a filter, “integrated smoke hours”.Type: GrantFiled: August 16, 2010Date of Patent: November 20, 2012Assignee: Vision Fire & Security Pty LtdInventors: Ron Knox, Karl Boettger
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Patent number: 8295541Abstract: Method and apparatus for detecting change of an object state from an initial state where the object is displayed in a plurality of sequential images. The system involves comparing a measure over a predetermined portion of each of the images corresponding to an object's initial state with a reference value of the measure computed when the object is in the initial state to generate a comparison value for each of the images and then generating a signal indicating that the object state has changed when a predetermined number of the comparison values generated for each of the images do not meet a predetermined criterion.Type: GrantFiled: June 30, 2005Date of Patent: October 23, 2012Assignee: Vision Fire & Security Pty LtdInventors: Matthew John Naylor, Matthew Paul Fettke, Neil Cameron Thatcher, Andrew Lennox Davis
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Patent number: 8224621Abstract: A method for the determination of the time of flight of a signal transmitted between a transmitter (42, 44) and a receiver (44, 42). In one form, the method involves transmitting a first signal and a second signal having a waveform modification introduced at a predetermined point in time of the duration of the second signal; receiving said first and second transmitted signals; determining a point of diversion between the first and second received signals to determine an arrival time of the introduced waveform feature modification at the receiver. In addition, the invention provides an accurate time of flight determination of ultrasonic signals in a flow sensor (24) adapted for a smoke detector system (10).Type: GrantFiled: May 14, 2004Date of Patent: July 17, 2012Assignee: Vision Fire & Security Pty LtdInventors: Kemal Ajay, Arjun Vinoo Caprihan, Michael Rezny
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Publication number: 20110243389Abstract: A smoke detecting method which uses a beam of radiation such as a laser (16), to monitor a region, such as 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 tuned “on” can be used as a reference point and compared to images taken with the laser turned “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.Type: ApplicationFiled: June 20, 2011Publication date: October 6, 2011Applicant: VISION FIRE & SECURITY PTY LTDInventors: Ron KNOX, Karl Boettger, Peter Meikle, Brian Alexander
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Patent number: 7983445Abstract: A smoke detecting method which uses a beam of radiation such as a laser (16), to monitor a region, such as 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 tuned “on” can be used as a reference point and compared to images taken with the laser turned “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.Type: GrantFiled: May 14, 2004Date of Patent: July 19, 2011Assignee: Vision Fire & Security Pty Ltd.Inventors: Ron Knox, Karl Boettger, Peter Meikle, Brian Alexander
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Patent number: 7777633Abstract: The present invention relates to a system for determining particle transmittance Tx of a filter for use with a particle detection system to provide a filter warning for aspirated particle detection systems by detecting a level of first particles having a size indicative of smoke particles and which pass through the detection system; determining an integrated smoke hours value by integrating the detected level of first particles over time; estimating the smoke particle transmittance Tx of the filter by applying a predetermined weighting operation to the integrated smoke hours value. An empirical measure of a filter's particle transmittance Tx, due to at least first particles having a size indicative of smoke particles may be achieved by way of integrating a level of such first particles passing through a particle detection system over time to determine the proportion of smoke particles arrested by a filter, “integrated smoke hours”.Type: GrantFiled: July 16, 2004Date of Patent: August 17, 2010Assignee: Vision Fire & Security Pty LtdInventors: Ron Knox, Karl Boettger
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Publication number: 20070230798Abstract: Method and apparatus for detecting change of an object state from an initial state where the object is displayed in a plurality of sequential images. The system involves comparing a measure over a predetermined portion of each of the images corresponding to an object's initial state with a reference value of the measure computed when the object is in the initial state to generate a comparison value for each of the images and then generating a signal indicating that the object state has changed when a predetermined number of the comparison values generated for each of the images do not meet a predetermined criterion.Type: ApplicationFiled: June 30, 2004Publication date: October 4, 2007Applicant: VISION FIRE & SECURITY PTY LTDInventors: Matthew Naylor, Matthew Fettke, Neil Thatcher, Andrew Davis
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Publication number: 20070176783Abstract: The present invention relates to a system for determining particle transmittance Tx of a filter for use with a particle detection system to provide a filter warning for aspirated particle detection systems by detecting a level of first particles having a size indicative of smoke particles and which pass through the detection system; determining an integrated smoke hours value by integrating the detected level of first particles over time; estimating the smoke particle transmittance Tx of the filter by applying a predetermined weighting operation to the integrated smoke hours value. An empirical measure of a filter's particle transmittance Tx, due to at least first particles having a size indicative of smoke particles may be achieved by way of integrating a level of such first particles passing through a particle detection system over time to determine the proportion of smoke particles arrested by a filter, “integrated smoke hours”.Type: ApplicationFiled: July 16, 2004Publication date: August 2, 2007Applicant: VISION FIRE & SECURITY PTY LTDInventors: Ron Knox, Karl Boettger