Air pump for particle sensing using regenerative fan, and associated methods
US6167107A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 1999 |
| Grant date | Dec 26, 2000 |
| Priority date | — |
| Expiry date | Jul 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/245
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention includes a particle sensor with a particle counter. A regenerative blower pulls ambient air into a flow within the particle counter, and a laser illuminates the flow to generate laser radiation indicative of particles within the flow. A detector detects the laser radiation; and particle sensing electronics counts particles within the flow at a preselected volumetric flow rate, e.g., 1 CFM. Preferably, the particle counter includes a plurality of pressure sensors; and a blower speed voltage controller adjusts the speed of the blower according to signals from the pressure sensors to achieve the preselected volumetric flow rate. The regenerative blower permits use of a high efficiency exhaust filter to filter air exhausted from the blower. An airflow path between the particle counter and the regenerative blower preferably has at least one bend between the particle counter and the blower to increase compactness of the system. An aerosol manifold can be connected for fluid communication with an inlet of the particle counter such that the regenerative blower draws air from the manifold at the preselected volumetric flow rate. The manifold samples ambient atmospheric air at …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.