Xtralis Technologies, Ltd.

Garrett Thermal Systems Limited

Vision Fire & Security Pty Ltd

Xtralis Global

Brian Alexander

Ron Knox

Kemal Ajay

Karl Boettger

Peter John Meikle

Kate Cooper

Rajiv Kumar Singh

Thor North

Stephen James Pattinson

Nitin Vayeda

Peter Massingberd-Mundy

Ronald Knox

Alasdair James Williamson

Peter Massingbard-Mundy

A method of determining at least one point of entry of smoke into a smoke detection system, the system having a sampling pipe network including at least one sampling pipe and a plurality of sampling inlets through which an air sample can enter the at least one sampling pipe of the smoke detection system for analysis by a particle detector, said method including: determining a volume of sample air that has passed through at least part of the smoke detection system since a predetermined event or a value corresponding to said volume; and determining through which sampling inlet of the plurality of sampling inlets the smoke entered the smoke detection system based, at least in part, on the determined volume or value. Systems for implementing such a method and related methods are also described.

Addressability in particle detection

A method of particle detection in an aspirated particle detection system having a sampling pipe network and a particle detector. The method includes drawing sample air to the particle detector through the air sampling network; analyzing the sample air with the particle detector; entering an amplification phase, in the event that a concentration of particles in the sample air greater than a predetermined threshold is detected, to create a plurality of sample air packets in the sampling pipe, wherein each sample air packet corresponds to a sampling inlet and includes an amplified concentration of air drawn from the corresponding sampling inlet; transporting the sample air including the plurality of sample air packets through the sampling pipe to the particle detector; and determining through which sampling inlet any particles entered the particle detection system.

Aspirated particle detection with various flow modifications

A particle separation system for separating particles in an airflow upstream of a detection chamber in an aspirating smoke detector is disclosed. The particle separation system includes an airflow path for directing the airflow from an inlet to an outlet. The airflow path includes a first airflow path section in a first direction and a second airflow path section in a second direction, the first and second directions being different relative to each other. The airflow path also includes at least one electrically charged surface such that the airflow undergoes electrostatic precipitation as it traverses the airflow path. A method of separating particles in an airflow upstream of a detection chamber in an aspirating smoke detector is also disclosed.

Particle precipitator

A system and method of reducing the incidence of false alarms attributable to dust in smoke detection apparatus. The method includes obtaining at least two sample air flows, subjecting a first airflow to particle reduction and measuring the level of particles in the first airflow and generating a first signal indicative of the intensity. The method also includes measuring the level of particles in the second airflow and generating a second signal indicative of the intensity. The first signal is compared to a predetermined alarm level and, if the alarm level is achieved, the first and second signals are subsequently compared and an output signal is generated based on the relative difference between the first and second signals.

Particle detector with dust rejection

A method of detecting particles in an air flow is described. The method includes receiving a signal indicative of light intensity scattered from the air flow at a plurality of wavelengths and processing the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter to generate an output signal indicative of at least one characteristic of particles in the air flow. A particle detection system is also described.

Detection of particle characteristics

A smoke detecting method 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 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 () compared to ambient light. Filters () may be used to decrease signals generated from background light.

Method of detecting particles by detecting a variation in scattered radiation

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Wantirna, Australia

Brian Alexander