Particle matter analysis device, analysis method and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11885729-B2
Application number	US-202016929509-A
Country	US
Kind code	B2
Filing date	Jul 15, 2020
Priority date	Oct 10, 2019
Publication date	Jan 30, 2024
Grant date	Jan 30, 2024

Abstract

A particle matter analysis device, an analysis method and a manufacturing method are disclosed. The particle matter analysis device includes a charger configured to receive power from a power supply device and to charge particles included in intaken air, an electrophoretic mobility particle collector configured to collect particles having electrophoretic mobility greater than a predetermined electrophoretic mobility among the charged particles based on an electrophoretic mobility and to measure a current of electrophoretic mobility particles, an aerodynamic particle collector configured to collect charged particles passing through the electrophoretic mobility particle collector based on an inertial force of the charged particles and to measure a current of aerodynamic particles, a filter configured to collect charged particles passing through the aerodynamic particle collector and to measure a current of filtered particles, and a processor, wherein the processor calculates a density of the particles based on a ratio of the current of electrophoretic mobility particles, the current of aerodynamic particles, and the current of filtered particles.

First claim

What is claimed is:

1. A particle matter analysis device comprising:
a charger configured to receive power from a power supply device and to charge particles included in intaken air;
an electrophoretic mobility particle collector configured to collect particles having electrophoretic mobility greater than a predetermined electrophoretic mobility among the charged particles based on an electrophoretic mobility and to measure a current of electrophoretic mobility particles;
an aerodynamic particle collector configured to collect charged particles passing through the electrophoretic mobility particle collector based on an inertial force of the charged particles and to measure a current of aerodynamic particles;
a filter configured to collect charged particles passing through the aerodynamic particle collector and to measure a current of filtered particles; and
a processor,
wherein the processor calculates a density of the particles based on a ratio of the current of electrophoretic mobility particles, the current of aerodynamic particles, and the current of filtered particles.

2. The particle matter analysis device as claimed in claim 1 , wherein
the processor is configured to calculate an overall current of the collected particles obtained by adding up the current of electrophoretic mobility particles, the current of aerodynamic particles, and the current of filtered particles, to calculate an average electrophoretic mobility particle diameter based on a ratio of the current of electrophoretic mobility particles to the calculated overall current, to calculate a dynamic overall current of the collected particles obtained by adding up the current of aerodynamic particles and the current of filtered particles, and to calculate a density of the particles based on the calculated average electrophoretic mobility particle diameter and the current of aerodynamic particles with respect to the calculated dynamic overall current.

3. The particle matter analysis device as claimed in claim 2 , wherein
the processor is configured to calculate a total number concentration of the particles based on a predetermined log-normal distribution, a predetermined variance value of a particle distribution, and the calculated average electrophoretic mobility particle diameter.

4. The particle matter analysis device as claimed in claim 1 , further comprising a nozzle including a multi-orifice including a plurality of flow paths arranged between the electrophoretic mobility particle collector and the aerodynamic particle collector and narrowing from the electrophoretic mobility particle collector toward the aerodynamic particle collector.

5. The particle matter analysis device as claimed in claim 1 , wherein
the aerodynamic particle collector comprises:
a first aerodynamic particle collector configured to collect charged particles passing through the electrophoretic mobility particle collector and to measure a first current of aerodynamic particles; and
a second aerodynamic particle collector configured to collect charged particles passing through the first aerodynamic particle collector and to measure a second current of aerodynamic particles.

6. The particle matter analysis device as claimed in claim 5 , wherein
the processor is configured to calculate an average electrophoretic mobility particle diameter, a variance value of particle distribution and a particle density based on the measured current of electrophoretic mobility particles, the first current of aerodynamic particles, the second current of aerodynamic particles, and the current of filtered particles.

7. The particle matter analysis device as claimed in claim 1 , wherein the electrophoretic mobility particle collector and the aerodynamic particle collector are integrally formed on one chip through a micro-electro mechanical systems (MEMS) process.

8. The particle matter analysis device as claimed in claim 1 , wherein
the electrophoretic mobility particle collector comprises first and second electrodes spaced apart from each other in a facing manner in a direction perpendicular to a flow direction in which the charged particles move,
wherein the first and second electrodes form a uniform electric field in a direction from the first electrode to the second electrode upon receiving a predetermined voltage from the power supply device, and the second electrode collects particles having an electrophoretic mobility greater than a predetermined electrophoretic mobility.

9. A particle matter analysis method comprising:
charging particles included in intaken air;
collecting particles having an electrophoretic mobility greater than a predetermined electrophoretic mobility among the charged particles based on the electrophoretic mobility and measuring a current of electrophoretic mobility particles;
collecting charged particles passing through an electrophoretic mobility particle collector based on an inertial force of the charged particles and measuring a current of aerodynamic particles;
collecting charged particles passing through an aerodynamic particle collector and measuring a current of filtered particles; and
calculating a density of the particles based on a ratio of the current of electrophoretic mobility particles, the current of aerodynamic particles, and the current of filtered particles.

10. The particle matter analysis method as claimed in claim 9 , wherein
the calculating of a density of particles comprises calculating an overall current of the collected particles obtained by adding up the current of electrophoretic mobility particles, the current of aerodynamic particles, and the current of filtered particles, calculating an average electrophoretic mobility particle diameter based on a ratio of the current of electrophoretic mobility particles to the calculated overall current, calculating a dynamic overall current of the collected particles obtained by adding up the current of aerodynamic particles and the current of filtered particles, and calculating a density of the particles based on the calculated average electrophoretic mobility particle diameter and the current of aerodynamic particles with respect to the calculated dynamic overall current.

11. The particle matter analysis method as claimed in claim 10 , further comprising:
calculating a total number concentration of the particles based on a predetermined log-normal distribution, a predetermined variance value of a particle distribution, and the calculated average electrophoretic mobility particle diameter.

12. The particle matter analysis method as claimed in claim 9 , wherein the measuring of the current of aerodynamic particles comprises collecting charged particles passing through the electrophoretic mobility particle collector and measuring a first current of aerodynamic particles, and collecting charged particles passing through a first aerodynamic particle collector and measuring a second current of aerodynamic particles.

13. The particle matter analysis method as claimed in claim 12 , wherein
the calculating of a density of particles comprises calculating an average electrophoretic mobility particle diameter, a variance value of particle distribution and a particle density based on the measured current of electrophoretic mobility particles, the first current of aerodynamic particles, the second current of aerodynamic particles, and the current of filtered particles.

Assignees

• Univ Yonsei Iacf
• Ind Academic Cooperation Foundation Yonsei Univeristy

Inventors

• Kim Yong-Jun
• Kwon Hong-Beom

Classifications

• G01N15/0656 Primary

  using electric, e.g. electrostatic methods or magnetic methods (by investigating individual particles G01N15/1031, G01N15/12) · CPC title

• B01D57/02 Primary

  by electrophoresis (treatment of water, waste water, sewage or sludge by electrophoresis C02F1/469; electrophoretic production of compounds or non-metals C25B7/00; investigating or analysing materials by using electrophoresis G01N27/26) · CPC title

• B03C3/12

  characterised by separation of ionising and collecting stations · CPC title

• B03C3/38

  Particle charging or ionising stations, e.g. using electric discharge, radioactive radiation or flames · CPC title

• B03C3/41

  Ionising-electrodes · CPC title