Semi-dry type method for automatically sampling PM2.5 particles
US10768077B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2018 |
| Grant date | Sep 8, 2020 |
| Priority date | — |
| Expiry date | Mar 19, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/383
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A semi-dry type method for automatically sampling PM2.5 particles. The method collects an aerosol sample in a dry mode and extracts it in a wet mode to prevent sampling artifacts. In the dry mode, a first stage utilizes carbon brushes as discharge electrodes to charge aerosol particles which are then collected on a cylinder wall by an electric field setup between a high-voltage central metal rod and a grounded cylinder in a second stage. In the wet mode, deionized (DI) water is injected into an electrostatic particle-into-liquid sampler (EPILS) in a pulsation manner by opening and closing solenoid valves intermittently, which dislodges aerosol particles deposited on the cylinder wall effectively to become a liquid aerosol sample. The liquid aerosol sample is then analyzed for chemical compositions automatically.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.