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Title:
PARTICLE DETECTION SENSOR
Document Type and Number:
WIPO Patent Application WO/2019/044250
Kind Code:
A1
Abstract:
A particle detection sensor (1) that detects a plurality of particles contained in a subject to be measured is provided with: a light projection unit (20) that outputs light toward a detection region (DA); a light receiving unit (30) which, in the cases where a particle to be detected, i.e., at least one of the particles, passes through the detection region (DA), receives light scattered by the particle; a housing (10), which houses the light projection unit (20) and the light receiving unit (30), and which has the detection region (DA) inside; and a signal processing circuit (50). The signal processing circuit (50) acquires the amount of intensity change of stray light over time, said stray light having been received by the light receiving unit (30) when the particles were not passing through the detection region (DA), then, on the basis of the acquired change amount over time, the signal processing circuit corrects the intensity of the scattering light thus received, and on the basis of corrected intensity of the scattering light thus received, classifies the particle into any one of the groups of a plurality of particle sizes, and identifies the number of detected particles, thereby calculating the mass concentration of the particles contained in the subject to be measured.

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Inventors:
NAGATANI YOSHIHARU
NAKAGAWA TAKASHI
KAWAHITO KEIKO
YASUIKE NORIYUKI
Application Number:
PCT/JP2018/027221
Publication Date:
March 07, 2019
Filing Date:
July 20, 2018
Export Citation:
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Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G01N15/02; G01N15/14; G01N21/03; G01N21/47
Domestic Patent References:
WO2017217078A12017-12-21
Foreign References:
JP2015210183A2015-11-24
JPH06201582A1994-07-19
JPH10334363A1998-12-18
JP2016180609A2016-10-13
JP2015200547A2015-11-12
JP2011086058A2011-04-28
JP2002195946A2002-07-10
JPH1194741A1999-04-09
JPH01213794A1989-08-28
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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