Honeywell International Inc.

Ouyang Yang

Kevin Cai

Chen Feng

Rui Hou

Tao Chen

Kai Huang

Anna Liu

Lu Tian

Lu Jinnan

Embodiments relate generally to systems and methods for detecting particulate matter in the air. A particulate matter sensor may comprise an airflow channel; a light source configured to pass light through the airflow channel; an airflow generator configured to generate airflow into the airflow channel; a waveguide configured to direct light from the light source after it passes through the airflow channel and scatters off of particulate matter within the airflow channel; a photodiode configured to receive light scattered by the waveguide; and a computing device coupled to the photodiode having a processor and a memory storing instructions which, when executed by the processor, determines a mass concentration of particles in the airflow channel based on an output of the photodiode.

Forward scatter in particulate matter sensor

Embodiments relate to systems and methods for providing airflow within a particulate matter sensor. A particulate matter sensor may comprise an air duct, a light source configured to pass light through the air duct, a extender connected to the light source configured to dissipate thermal energy generated by the light source, and to generate a updraft of airflow into the air duct, a photodetector located in the air duct, and a computing device coupled to the photodetector. The computing device has a processor and a memory storing instructions which, when executed by the processor, determines a mass concentration of particles in the air duct based on an output of the photodetector.

Utilizing updraft flow in a fan-less dust sensor

A particulate matter (PM) sensor. The sensor comprises a mass separation fluid tunnel body defining a fluid inflow channel, a first fluid channel branch opening off of the inflow channel and having a first outlet, a second fluid channel branch opening off of the inflow channel and having a second outlet, and a fluid port between the first fluid channel branch and the second fluid channel branch, a fan located downstream of the first outlet and the second outlet, a photodetector located in the first fluid channel branch, and a computing device coupled to the photodetector having a processor and a memory storing instructions which, when executed by the processor, determines a mass concentration of particles in the first fluid channel branch based on an output of the photodetector.

Dust sensor with mass separation fluid channels and fan control

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Shanghai, China

Ouyang Yang