Portable device for detecting and measuring particles entrained in the air
US9995667B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Apr 21, 2016 |
| Grant date | Jun 12, 2018 |
| Priority date | — |
| Expiry date | Jun 10, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/0642
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A portable ambient air quality monitor having an enclosure to enclose and protect the monitor from an ambient environment and an airflow intake for controllably allowing ambient air to enter the monitor. A photodiode is disposed at a location downstream from a fan. The airflow from the fan is laminarized by a mesh or baffle to allow a thin stream of air to flow over the photodiode. A sensing region is defined by an intersection of an airflow sampling path and an optical path. The sensing region is also disposed above the photodiode. The airflow sampling path is configured to receive laminar airflow from the airflow intake and for directing the laminar airflow into the sensing region. A light beam is generated from a laser to reflect the light beam for reducing the required area of the sensing region to detect and measure the particles floating in the ambient air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.