Pulsed diffusion condensation particle counter
US12111241B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 2022 |
| Grant date | Oct 8, 2024 |
| Priority date | — |
| Expiry date | Jan 2, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N15/075
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus to create water vapor supersaturation and particulate counts from an air sample. The method and apparatus include introducing an air sample into a chamber connected to an optical detector and an outlet by pumping at the outlet. The method further includes passing air through the chamber and optical detector in a steady flow, and subsequently closing the inlet while continuing the pumping to expand the air sample and exhaust a portion of the air sample through the optical detector. The walls of the particle chamber are wetted with a fluid such as water, and one portion of the wall is warmer than the other portions such that there is some condensational growth prior to the expansion, and yet more condensational growth during the expansion. The cycles are repeated by continuously repeating the introducing, passing and closing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.