Particle detector, system and method
First Claim
Patent Images
1. A method of detecting particles comprising:
- emitting a first beam of radiation into a monitored region;
detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation;
determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; and
comparing the recorded intensity with a recorded intensity at a previous time,wherein the previous time is a time of installation.
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Abstract
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).
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Citations
18 Claims
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1. A method of detecting particles comprising:
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emitting a first beam of radiation into a monitored region; detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation; determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; and comparing the recorded intensity with a recorded intensity at a previous time, wherein the previous time is a time of installation.
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2. A method of detecting particles comprising:
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emitting a first beam of radiation into a monitored region; detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation; determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; comparing the recorded intensity with a recorded intensity at a previous time; and estimating particulate density based on said path loss measurement. - View Dependent Claims (3)
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4. A method of detecting particles comprising:
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emitting a first beam of radiation into a monitored region; detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation; determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; comparing the recorded intensity with a recorded intensity at a previous time; and using the path loss measurement in conjunction with scattering information to estimate mean particle density.
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5. A method of detecting particles comprising:
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emitting a first beam of radiation into a monitored region; detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation; determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; comparing the recorded intensity with a recorded intensity at a previous time; and using the path loss measurement in conjunction with scattering information to discriminate particle type. - View Dependent Claims (6, 7, 17)
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8. A method of detecting particles comprising:
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emitting a first beam of radiation into a monitored region; detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation; determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; comparing the recorded intensity with a recorded intensity at a previous time; providing a second emitted beam having its source adjacent and at an angle to a second image capturing device such that the second beam crosses the field of view of the second image capturing device; and detecting backscattered light from the monitored region.
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9. A method of detecting particles comprising:
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emitting a first beam of radiation into a monitored region; detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation; determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; and comparing the recorded intensity with a recorded intensity at a previous time, wherein the detected backscattered light has an angle of scattering of any one or more of; about 180°
with respect to the emitted beam direction;slightly less than 180 degrees to the beam direction; and greater than 90 degrees.
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10. A method of detecting particles comprising:
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emitting a first beam of radiation into a monitored region; detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation; determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; comparing the recorded intensity with a recorded intensity at a previous time; and detecting a variation in images of the region such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to forward scattered radiation. - View Dependent Claims (11)
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12. A method of detecting particles comprising:
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emitting a first beam of radiation into a monitored region; detecting a variation in images of the region with a first image capturing device such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to backscattered radiation; determining a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured image; comparing the recorded intensity with a recorded intensity at a previous time; providing edge detection and correlation of the captured image to determine whether there has been physical movement of a beam and image capture device; and providing Image processing to determine movement of a target marker in the captured image beyond a threshold alarm level to thereby determine whether there has been physical movement of a beam and image capture device; and providing an additional source of emitted radiation into the monitored region to provide markers for the image capture device to thereby determine whether there has been physical movement of a beam and image capture device pair.
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13. A particle detection system comprising:
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a light source emitting a first beam of radiation into a monitored region; and a first image capturing device configured to detect a variation in images of the region such that the variation in images indicates the presence of the particles and wherein the light source and first image capturing device are arranged such that the variation in images corresponds to backscattered radiation; the particle detection system being further configured to; determine a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured images compare the recorded intensity with a recorded intensity at a previous time; and further comprising; a second image capturing device arranged to capture images of the region with such that the variation in images indicates the presence of the particles and wherein the variation in images corresponds to forward scatted radiation. - View Dependent Claims (14)
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15. A particle detection system comprising:
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a light source emitting a first beam of radiation into a monitored region; and a first image capturing device configured to detect a variation in images of the region such that the variation in images indicates the presence of the particles and wherein the light source and first image capturing device are arranged such that the variation in images corresponds to backscattered radiation; the particle detection system being further configured to; determine a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured images; compare the recorded intensity with a recorded intensity at a previous time; and further comprising; a second beam of radiation emitted into the monitored region to enable the detection of particles using forward scattered radiation. - View Dependent Claims (18)
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16. A particle detection system comprising:
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a light source emitting a first beam of radiation into a monitored region; and a first image capturing device configured to detect a variation in images of the region such that the variation in images indicates the presence of the particles and wherein the light source and first image capturing device are arranged such that the variation in images corresponds to backscattered radiation; the particle detection system being further configured to; determine a path loss measurement by recording the intensity of a target incident beam spot of the emitted first beam within the captured images; compare the recorded intensity with a recorded intensity at a previous time; and further comprising; a light source emitting a second emitted beam, said source being arranged adjacent and at an angle to a second image capturing device such that the second beam crosses the field of view of the second image capturing device.
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Specification