Particulate matter sensor and method therefor
US11604131B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 2018 |
| Grant date | Mar 14, 2023 |
| Priority date | — |
| Expiry date | Nov 17, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/03
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Various embodiments include methods and systems to measure and calibrate an optical particle spectrometer for reporting mass concentration. In one embodiment, an optical particle spectrometer is used to measure a concentration of particulate matter in a sampled particle-laden airstream. A particle diverter, in fluid communication with the spectrometer, diverts at least a portion of the particle-laden airstream at predetermined intervals. In one example, a mass filter receives the portion of the particle-laden airstream and filters a fraction of the particles within the airstream that are above a predetermined particle size. A mass sensor measures a mass of the fraction of the particles received from the mass filter or from the particle diverter and uses a calibration communication loop to provide the measured mass to the spectrometer to apply a correction factor to report mass concentration from the optical particle spectrometer. Other methods and systems are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.