DEVICES, SYSTEMS AND METHODS FOR DETECTING PARTICLES
First Claim
1. A particle detector, comprising:
- a housing comprising a sample inlet and a sample outlet, and enclosing a detection cavity having a cavity length elongated along a longitudinal axis, wherein the housing defines a flow path for a sample fluid from the sample inlet, through the detection cavity along the longitudinal axis, and to the sample outlet;
a light source configured for directing irradiating light through the detection cavity along the longitudinal axis to particles of the sample fluid flowing in the detection cavity; and
a photo-responsive material facing the detection cavity and positioned along at least a portion of the cavity length at a radial distance from the longitudinal axis, wherein the photo-responsive material is configured for receiving measurement light propagating from the particles in a plurality of measurement light paths angled relative to the longitudinal axis.
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Abstract
A particle detector includes a housing, a light source, and a photo-responsive material. The housing includes a sample inlet and a sample outlet, and encloses a detection cavity. The light source directs irradiating light to particles of a sample fluid flowing in the detection cavity. The photo-responsive material faces the detection cavity, and receives measurement light propagating from the particles in a plurality of measurement light paths angled relative to a longitudinal axis. The particle detector may be utilized to measure scattered light and/or light emitted due to autofluorescence. Fluids sampled may include aerosols, bio-aerosols, and liquids.
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Citations
34 Claims
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1. A particle detector, comprising:
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a housing comprising a sample inlet and a sample outlet, and enclosing a detection cavity having a cavity length elongated along a longitudinal axis, wherein the housing defines a flow path for a sample fluid from the sample inlet, through the detection cavity along the longitudinal axis, and to the sample outlet; a light source configured for directing irradiating light through the detection cavity along the longitudinal axis to particles of the sample fluid flowing in the detection cavity; and a photo-responsive material facing the detection cavity and positioned along at least a portion of the cavity length at a radial distance from the longitudinal axis, wherein the photo-responsive material is configured for receiving measurement light propagating from the particles in a plurality of measurement light paths angled relative to the longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A particle detector, comprising:
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a housing comprising a sample inlet and a sample outlet, and enclosing a detection cavity having a cavity length along a longitudinal axis, wherein the housing defines a flow path for a sample fluid from the sample inlet, through the detection cavity, and to the sample outlet, wherein the detection cavity comprises a first detection zone and a second detection zone downstream from the first detection zone; a first light source configured for directing a first irradiating light to particles of the sample fluid flowing in the first detection zone; a second light source configured for directing a second irradiating light to particles of the sample fluid flowing in the second detection zone; and a photo-responsive material facing the detection cavity and positioned along at least a portion of the cavity length at a radial distance from the longitudinal axis, wherein the photo-responsive material is configured for receiving measurement light propagating from the particles in a plurality of measurement light paths angled relative to the longitudinal axis. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. A particle detector, comprising:
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a housing comprising a sample inlet and a sample outlet, and enclosing a detection cavity having a cavity length elongated along a longitudinal axis, wherein; the housing defines a flow path for a sample fluid from the sample inlet, through the detection cavity, and to the sample outlet along the longitudinal axis; the sample inlet comprises an axial inlet section on the longitudinal axis; the sample outlet comprises an axial outlet section on the longitudinal axis; the sample outlet comprises an axial outlet section on the longitudinal axis; the axial inlet section and the axial outlet section having respective maximum radial dimensions along a radial direction orthogonal to the longitudinal axis; and the detection cavity has a characteristic dimension in a range from 0.1% to 200% greater than the characteristic dimension of the axial inlet section and the axial outlet section; a light source configured for directing irradiating light through the detection cavity along the longitudinal axis to particles of the sample fluid flowing in the detection cavity; and a photo-responsive material facing the detection cavity and positioned along at least a portion of the cavity length at a radial distance from the longitudinal axis, wherein the photo-responsive material is configured for receiving measurement light propagating from the particles in a plurality of measurement light paths angled relative to the longitudinal axis. - View Dependent Claims (29)
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30. A particle detector, comprising:
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a housing comprising a sample inlet and a sample outlet, and enclosing a detection cavity having a cavity length elongated along a longitudinal axis, wherein the housing defines a flow path for a sample fluid from the sample inlet, through the detection cavity, and to the sample outlet along the longitudinal axis; a light source configured for directing irradiating light through the detection cavity along the longitudinal axis to particles of the sample fluid flowing in the detection cavity; a plurality of mirrors in the detection cavity, wherein; the detection cavity has a dimension along a transverse axis orthogonal to the longitudinal axis; and the mirrors are configured for reflecting the irradiating light one or more times such that the irradiating light traverses the detection cavity two or more times along directions having a component along the transverse axis; and a photo-responsive material facing the detection cavity and positioned along at least a portion of the cavity length at a radial distance from the longitudinal axis, wherein the photo-responsive material is configured for receiving measurement light propagating from the particles in a plurality of measurement light paths angled relative to the longitudinal axis. - View Dependent Claims (31)
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32. A particle detector, comprising:
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a housing comprising a sample inlet and a sample outlet, and enclosing a detection cavity having a cavity length along a longitudinal axis, wherein the housing defines a flow path for a sample fluid from the sample inlet, through the detection cavity, and to the sample outlet; a light source configured for directing irradiating light along the longitudinal axis to particles of the sample fluid flowing in the detection cavity; a beam chopper configured for chopping the irradiating light; and a photo-responsive material facing the detection cavity and positioned along at least a portion of the cavity length at a radial distance from the longitudinal axis, wherein the photo-responsive material is configured for receiving measurement light propagating from the particles in a plurality of measurement light paths angled relative to the longitudinal axis. - View Dependent Claims (33, 34)
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Specification