Particle concentration measuring device
First Claim
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1. A particle concentration measuring device characterized by comprising:
- a measurement region formation part which has a wall (10) of substantially ring-form defining an inner opening through which gas flows relatively orthogonally;
a light curtain forming unit (12A, 12B) forming a planar light curtain (FL) in the opening inner part;
a particle detecting unit (15) which uses a camera and receives scattered light from particles passing through the light curtain (FL) to detect the particles; and
a calculating unit (22) calculating particle concentration based on a total number of the particles detected by the particle detecting unit (15) in a volume of an airflow passing through the light curtain in a unit time, by means of the expression c=n/(r×
v×
T)whereinc is particle concentration;
n is number of particles;
r is area of a measurement region;
v is airflow velocity, but if a measurement region formation part move, v is movement speed of the measurement region formation part, and T is measurement time;
where the device is provided at a place where an airflow flows uniformly through the inner opening; and
where positions of the measurement region formation part, the light curtain forming unit (12A, 12B), and the particle detecting unit (15) are fixed.
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Abstract
A particle concentration measuring device includes: a measurement region formation part which has a wall (10) of substantially ring-form and through an inner opening of which gas relatively flows orthogonally; a light curtain forming unit (12A, 12B) forming a planar light curtain (FL) in the inner opening: a particle detecting unit (15) receiving scattered light from particles passing through the light curtain (FL) to detect the particles; and a calculating unit (22) calculating particle concentration based on the total number of the particles detected by the particle detecting unit (15) in a volume of an airflow passing through the light curtain (FL) in a unit time.
14 Citations
5 Claims
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1. A particle concentration measuring device characterized by comprising:
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a measurement region formation part which has a wall (10) of substantially ring-form defining an inner opening through which gas flows relatively orthogonally; a light curtain forming unit (12A, 12B) forming a planar light curtain (FL) in the opening inner part; a particle detecting unit (15) which uses a camera and receives scattered light from particles passing through the light curtain (FL) to detect the particles; and a calculating unit (22) calculating particle concentration based on a total number of the particles detected by the particle detecting unit (15) in a volume of an airflow passing through the light curtain in a unit time, by means of the expression c=n/(r×
v×
T)wherein c is particle concentration; n is number of particles; r is area of a measurement region; v is airflow velocity, but if a measurement region formation part move, v is movement speed of the measurement region formation part, and T is measurement time; where the device is provided at a place where an airflow flows uniformly through the inner opening; and where positions of the measurement region formation part, the light curtain forming unit (12A, 12B), and the particle detecting unit (15) are fixed. - View Dependent Claims (2, 3, 4, 5)
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Specification
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Current AssigneeShin Nippon Air Technologies Company Limited
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Original AssigneeShin Nippon Air Technologies Company Limited
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InventorsOkamoto, Ryuta, Sakamoto, Kazuhiko, Kawakita, Hiroshi, Okami, Hiroyuki, Iso, Yusuke
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Primary Examiner(s)PHAM, HOA Q
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Application NumberUS13/160,100Publication NumberTime in Patent Office938 DaysField of Search356335-343, 356432-440US Class Current356/438CPC Class CodesG01N 21/53 within a flowing fluid, e.g...
