Pathogen and particle detector system and method
First Claim
1. A detector system for detecting biological organisms or biological agents of predetermined particle size in a fluid comprising:
- a housing having a passageway to allow for a fluid to flow through the housing;
a first light source for sending a light beam through the fluid in the passageway, whereby portions of the light beam are scattered at various angles by particles of various sizes present in the fluid, and wherein an unscattered portion of the light beam remains unscattered;
a first detector positioned to receive scattered portions of said light beam after said passageway for detecting and discriminating between particles of a selected size range in the fluid;
a lens receiving the light beam as it exits the passageway; and
a reflector placed behind the lens to reflect the unscattered portion of the light beam and a portion of light beam scattered at a low angle, whereby the unscattered portion of the light beam and the portion of the light beam scattered at a low angle are received by a low angle detector;
a second light source for sending light through said fluid passing in the passageway for exciting fluorescence in the particles in said fluid; and
a second detector positioned to receive light from said second light source for detecting fluorescence of said particles.
4 Assignments
0 Petitions
Accused Products
Abstract
A particle detector has a sample area of cross section no in excess of about 2 mm for containing environmental fluid, a light source on one side of the sample area for directing a collimated or nearly collimated beam of light through the sample air or water so that part of the light beam will be scattered by any particles present in the air or water while the remainder remains unscattered, and a beam diverting device on the opposite side of the sample area for diverting or blocking at least the unscattered portion of the beam of light and directing at least part of the scattered light onto a detector. The detector produces output pulses in which each pulse has a height proportional to particle size and a pulse height discriminator obtains the size distribution of airborne particles detected in the air or water sample at a given time from the detector output. The detector may also include a device for discriminating between biological agents and inorganic particles.
189 Citations
28 Claims
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1. A detector system for detecting biological organisms or biological agents of predetermined particle size in a fluid comprising:
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a housing having a passageway to allow for a fluid to flow through the housing; a first light source for sending a light beam through the fluid in the passageway, whereby portions of the light beam are scattered at various angles by particles of various sizes present in the fluid, and wherein an unscattered portion of the light beam remains unscattered; a first detector positioned to receive scattered portions of said light beam after said passageway for detecting and discriminating between particles of a selected size range in the fluid; a lens receiving the light beam as it exits the passageway; and a reflector placed behind the lens to reflect the unscattered portion of the light beam and a portion of light beam scattered at a low angle, whereby the unscattered portion of the light beam and the portion of the light beam scattered at a low angle are received by a low angle detector; a second light source for sending light through said fluid passing in the passageway for exciting fluorescence in the particles in said fluid; and a second detector positioned to receive light from said second light source for detecting fluorescence of said particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A detector system for detecting biological organisms or biological agents of predetermined particle size in a fluid comprising:
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a housing having a passageway to allow for a fluid to flow through the housing; a first light source for sending a light beam through the fluid in the passageway, whereby portions of the light beam are scattered at various angles by particles of various sizes present in the fluid, and wherein an unscattered portion of the light beam remains unscattered; a first detector positioned to receive scattered portions of said light beam after said passageway for detecting and discriminating between particles of a selected size range in the fluid; a lens receiving the light beam as it exits the passageway; and a reflector placed behind the lens to reflect the unscattered portion of the light beam and a portion of light beam scattered at a low angle, whereby the unscattered portion of the light beam and the portion of the light beam scattered at a low angle are received by a low angle detector. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification