David M Workman

US Patent:

20210316175, Oct 14, 2021

Filed:

Oct 31, 2019

Appl. No.:

17/290216

Inventors:

- Berkeley CA, US
Kenneth Farmer - Lake Elmo MN, US
Melissa Grose - Shoreview MN, US
Susanne Vera Hering - Berkeley CA, US
Gregory Stephen Lewis - Berkeley CA, US
Steven Russel Spielman - Oakland CA, US
David Workman - Shoreview MN, US

International Classification:

A62B 27/00
G01N 1/22
G01N 15/06

Abstract:

A system includes a first and second condensation particle counter, each counter having an inlet port, a growth column, and an optical element for counting particles detected at the respective inlet ports. The counters are configured to include a wick in which the wick is wetted by water. A differential pressure sensor is coupled to the first inlet port and coupled to the second inlet port. The sensor is configured to provide a pressure signal. A processor is coupled to memory and configured to receive the first signal, the second signal, and the pressure signal and generate an output corresponding to a ratio of the first signal and the second signal and correlate the ratio with the pressure signal. A housing is configured to receive the first counter, the second counter, the differential pressure sensor, the processor, and the memory.