Particle sensor and sensing method
US10859485B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 2016 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Sep 7, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2015/0046
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A particle sensor includes an aperture for receiving a gas flow with entrained particles, an electrostatic particle charging section, a parallel-plate particle precipitation section; and a sensor for detecting precipitated particles to produce a sensor signal. The sensor signal Isensor is related to an apparent particle number concentration of the particles in the gas flow entering the charging section by a calibration constant S1, such that Isensor=f(Napp, S1), the calibration constant being dependent on a count mean diameter of the particles in the gas flow entering the charging section according to a first relationship. The particle sensor includes a pre-filter positioned upstream from the charging section, the pre-filter filtering a part of the particles from the gas flow entering the pre-filter, a fractional degree of particle filtering depending on the count mean particle diameter of the particles entering the pre-filter according to a second relationship.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.