Abrégé

A particle detector, e.g. a smoke detector is described. In one form the detector includes a detection chamber and radiation source emitting a single beam of radiation. The detector also includes a radiation receiving system and an imaging system arranged to receive radiation from a common region of interest. Methods and systems for analysing the output of a particle detector are also disclosed.

Classes IPC  ?

• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée

Abrégé

There is describes a filter arrangement (10) for a particle detector (12) for detecting particles in an environment. The particle detector (12) can include one or more sensors (30) for analysing fluid in a detection region to produce sensor output. The filter arrangement (30) includes structure defining flow paths, for conveying fluid from the environment towards the detection region, including a first flow path (22), which includes a filter(26), and a second flow path (24) bypassing the filter(10). There is also provided a mechanism (120B) for controlling relative flow rates of fluid through the first flow path (22) and the second flow path (24) and a controller (32) configured to receive the sensor output corresponding to at least two relative flow rates and apply logic thereto to generate an output indicative of a condition of the filter.

Classes IPC  ?

• B01D 46/42 - Equipement auxiliaire ou son utilisation
• G08B 17/113 - Déclenchement par la présence de fumée ou de gaz utilisant une chambre d'ionisation pour détecter de la fumée ou du gaz - Détails de structure

Abrégé

A particle detector (10) including a chamber (12), a first aspirator (14), a sensor(s) (28), a controller (20) and clean air supply (18). The controller, when in a detecting mode, receives an indicative signal from the sensor and applies logic to the indicative signal to generate a further signal (22), and when in the purge mode controls substantial purging of the chamber of sample fluid with clean fluid from the clean fluid supply. The controller receives the indicative signal when the chamber is so purged and if necessary adjusts the logic in response thereto.

Classes IPC  ?

• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée
• G01N 21/53 - Dispersion, c. à d. réflexion diffuse dans un corps ou dans un fluide dans un courant de fluide, p.ex. dans la fumée

Abrégé

An apparatus and methods for detecting the presence of gases is described. The gas detection apparatus (10, 510) includes, a housing (30) adapted to be in fluid communication with a duct (504) of a particle detection system (500), and at least one gas detector (42, 43) sensitive to a target species arranged in fluid communication with the housing (30) to detect the presence of the target species in at least part of the air sample flowing in a duct (504). In one form the gas detection apparatus (10, 510) forms part of a system (700) for detecting a condition in an environment that includes, a particle detector (502); a duct system (504) in fluid communication with the environment and the particle detector (504) and an aspirator (518) to draw an air sample flow (72) from the environment to the particle detector (502).

Classes IPC  ?

• G01N 1/26 - Dispositifs pour prélever des échantillons à l'état gazeux avec mesures prises pour l'aspiration à partir de plusieurs endroits
• F24F 11/30 - Aménagements de commande ou de sécurité en relation avec le fonctionnement du système, p.ex. pour la sécurité ou la surveillance
• G08B 17/117 - Déclenchement par la présence de fumée ou de gaz en utilisant un dispositif de détection pour des gaz spécifiques, p.ex. des produits de combustion, produits par l'incendie
• G08B 21/16 - Alarmes réagissant aux gaz combustibles

Abrégé

A beam detector (10) including a light source (32), a receiver (34), and a target (36), acting in co-operation to de-tect particles in a monitored area (38). The target (36), reflects incident light (40), resulting in reflected light (32) being returned to receiver (34). The receiver (34) is a receiver is capable of recording and reporting light intensity at a plurality of points across its field of view. In the preferred form the detector (10) emits a first light beam (3614) in a first wavelength band; a second light beam (3618) in a second wavelength band; and a third light beam (3616) in a third wavelength band, wherein the first and second wavelengths bands are substantially equal and are different to the third wavelength band.

Classes IPC  ?

• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée
• G01N 21/53 - Dispersion, c. à d. réflexion diffuse dans un corps ou dans un fluide dans un courant de fluide, p.ex. dans la fumée

Abrégé

A beam detector (10) including a light source (32), a receiver (34), and a target (36), acting in cooperation to detect particles in a monitored area (38). The target (36), reflects incident light (40), resulting in reflected light (32) being returned to receiver (34). The receiver (34) is a receiver is capable of recording and reporting light intensity at a plurality of points across its field of view. In the preferred form the detector (10) emits a first light beam (3614) in a first wavelength band; a second light beam (3618) in a second wavelength band; and a third light beam (3616) in a third wavelength band, wherein the first and second wavelengths bands are substantially equal and are different to the third wavelength band.

Classes IPC  ?

• G01N 21/53 - Dispersion, c. à d. réflexion diffuse dans un corps ou dans un fluide dans un courant de fluide, p.ex. dans la fumée
• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée

Abrégé

A particle detection system 600 including; at least one light source (606) adapted to illuminate a volume being monitored (610) at at least two wavelengths; a receiver (604) having a field of view (620) and being adapted to receive light from at least one light source (606, 607) after said light has traversed the volume being monitored and being adapted to generate signals indicative of the intensity of light received at regions within the field of view of the receiver; a processor (624) associated with the receiver (604) adapted to process the signals generated by the receiver to correlate light received at at least two wavelengths in corresponding regions within the field of view of the receiver and generate an output indicative of the relative level of light re-ceived at the two wavelengths.

Classes IPC  ?

• G01N 21/53 - Dispersion, c. à d. réflexion diffuse dans un corps ou dans un fluide dans un courant de fluide, p.ex. dans la fumée
• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée

Abrégé

A particle detection system 600 including; at least one light source (606) adapted to illuminate a volume being monitored (610) at at least two wavelengths; a receiver (604) having a field of view (620) and being adapted to receive light from at least one light source (606, 607) after said light has traversed the volume being monitored and being adapted to generate signals indicative of the intensity of light received at regions within the field of view of the receiver; a processor (624) associated with the receiver (604) adapted to process the signals generated by the receiver to correlate light received at at least two wavelengths in corresponding regions within the field of view of the receiver and generate an output indicative of the relative level of light received at the two wavelengths.

Classes IPC  ?

• G08B 17/103 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière

Abrégé

There are described systems for improving the sensitivity, usability, and robustness of particle detection systems (100) adapted to detect particles directly in a volume (110) being monitored, the system (100) including at least one illumination means (102) for directing a beam (106) of radiation through at least part of the air volume being monitored (110), an image sensor (104) is positioned to capture images of a least part of a beam (106) from an illumination means (102); and means to analyse (107) the captured images to detect the presence of particles within the volume on the basis of radiation captured in the images.

Classes IPC  ?

• G01M 11/02 - Test des propriétés optiques

Abrégé

There are described systems for improving the sensitivity, usability, and robustness of particle detection systems (100) adapted to detect particles directly in a volume (110) being monitored, the system (100) including at least one illumination means (102) for directing a beam (106) of radiation through at least part of the air volume being monitored (110), an image sensor (104) is positioned to capture images of a least part of a beam (106) from an illumination means (102); and means to analyse (107) the captured images to detect the presence of particles within the volume on the basis of radiation captured in the images.

Classes IPC  ?

• G01N 21/53 - Dispersion, c. à d. réflexion diffuse dans un corps ou dans un fluide dans un courant de fluide, p.ex. dans la fumée
• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée

Abrégé

ABSTRACT There are described systems for improving the sensitMty, usability, and robustness of particle detection systems (100) adapted to detect particles directly in a volume (110) being monitored, the system (100) including at least one illumination means (102) for directing a beam (106) of radiation through at least part of the air volume being monitored (110), an image sensor (104) is positioned to capture images of a least part of a beam (106) from an illumination means (102); and means to analyse (107) the captured images to detect the presence of particles within the volume on the basis of radiation captured in the images. CA 3103000 2020-12-17

Classes IPC  ?

• G01N 15/10 - Recherche de particules individuelles
• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée
• G08B 29/04 - Surveillance des circuits détecteurs

Abrégé

In one form the present invention provides an apparatus (10) in an airflow path before a particle detector (38), wherein the apparatus (10) removes a substantially constant proportion of all sizes of airborne particles from the airflow over time. In a preferred form the apparatus includes a flow splitting arrangement (18) configured to divide a fluid flow into a plurality of sub- flows, the splitting arrangement 10 including means (22, 23) for defining a plurality of substantially identically dimensioned flow apertures configured to direct a portion of the fluid into a respective sub-flow.

Classes IPC  ?

• G08B 17/10 - Déclenchement par la présence de fumée ou de gaz
• B01D 35/00 - Dispositifs filtrants ayant des particularités non couvertes spécifiquement par les groupes , applications non couvertes spécifiquement par les groupes ; Dispositifs auxiliaires pour la filtration; Structure du carter de filtre
• G01N 1/18 - Dispositifs pour prélever des échantillons à l'état liquide ou fluide avec mesures prises pour diviser des échantillons en plusieurs parties
• G01N 1/34 - Purification; Nettoyage
• G01N 1/38 - Dilution, dispersion ou mélange des échantillons
• G08B 17/12 - Déclenchement par la présence de rayonnement ou de particules, p.ex. de rayonnement infrarouge ou d'ions

Abrégé

In one form the present invention provides an apparatus (10) in an airflow path before a particle detector (38), wherein the apparatus (10) removes a substantially constant proportion of all sizes of airborne particles from the airflow over time. In a preferred form the apparatus includes a flow splitting arrangement (18) configured to divide a fluid flow into a plurality of sub-flows, the splitting arrangement 10 including means (22, 23) for defining a plurality of substantially identically dimensioned flow apertures configured to direct a portion of the fluid into a respective sub-flow.

Classes IPC  ?

• G01N 1/38 - Dilution, dispersion ou mélange des échantillons

Abrégé

The invention provides use of one or more emitted beams of radiation (16), for example, laser beam(s), in combination with an image capturing means (14), for example, one or more video cameras and/or optical elements to detect particles (30), for example, smoke particles, located in an open space (12).

Abrégé

The invention provides a method of detecting particles. The method includes emitting a beam of radiation from a light source into a monitored region and detecting an increase in scattered radiation intensity in images of the region captured by a camera, the increase in scattered radiation intensity in images of the region indicating the presence of the particles wherein the beam of radiation and a means of detecting the increase in scattered radiation intensity in images are adapted to communicate data. The field of view of the camera includes at least part of a path of a laser beam and the laser beam does not impact on the camera directly. The light source is within the field of view of the camera.

Classes IPC  ?

• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée

Abrégé

The invention provides use of one or more emitted beams of radiation (16), for example, laser beam(s), in combination with an image capturing means (14), for example, one or more video cameras and/or optical elements to detect particles (30), for example, smoke particles, located in an open space (12).

Classes IPC  ?

• G08B 17/10 - Déclenchement par la présence de fumée ou de gaz
• G08B 17/107 - Déclenchement par la présence de fumée ou de gaz utilisant un dispositif émetteur et récepteur de lumière pour détecter une diffusion de lumière due à de la fumée