Paul A Solomon

US Patent:

20190293538, Sep 26, 2019

Filed:

Nov 9, 2017

Appl. No.:

16/348790

Inventors:

- Urbana IL, US
- Oakland CA, US
- San Francisco CA, US
- Washington DE, US
Richard WHITE - Oakland CA, US
Paul SOLOMON - Washington DC, US
Ben GOULD - Oakland CA, US
Frederick DOERING - Oakland CA, US
Dave WOLSEY - Oakland CA, US
Melissa LUNDEN - San Francisco CA, US
Stacy OZAKI - San Francisco CA, US

International Classification:

G01N 15/06
G01N 1/40

Abstract:

Microfabricated PM sensors measure concentrations of particulate matter (PM) in air. Some sensors improve the accuracy of measurements by accounting for the effect of ambient conditions (e.g., temperature or humidity) on mass-sensitive elements employed to determine a mass of the PM in a stream of air. Some sensors improve the accuracy of measurements by controlling humidity in the stream of air measured by mass-sensitive elements. Some sensors employ a plurality of mass-sensitive elements to extend the useful life of the PM sensor. Some sensors employ one or more mass-sensitive elements and heating elements to cause deposition and allow measurement of different sizes of PM. Some sensors can measure mass concentration of coarse PM in addition to fine PM in a stream of air. Some sensors control the flow rate of a stream of air measured by mass-sensitive elements. Some sensors include features to mitigate electromagnetic interference or electromagnetic signal loss.