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US 12,306,104 B2Granted
Particulate detection, counting, and identification
AssigneeWynd Technologies, Inc.
InventorsJason Duy Vuu, Raymond Rui Wu
Life of this patent
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Abstract
Particulate sensing systems or processes identify particulates suspended in an air sample by irradiating the air sample with UV light and measuring light from individual particles in the air sample. Two photodiodes having different wavelength sensitivity may be used to measure the fluorescent light emitted from a single particle, and a type of the particle may be identified using outputs from photodiodes. Repeating the process for multiple particles may produces distributions that further distinguish or identify particulate types.
Claims14
A particulate matter sensor comprising:
- a beam source positioned to direct a beam through gas sample in a sensing volume, the beam being a monochromatic beam;
- a first light sensor positioned to repeatedly measure light from interactions of the beam with particulates in the sensing volume, the first light sensor having a first measurement sensitivity;
- a second light sensor positioned to repeatedly measure the light from the interactions of the beam with the particulates in the sensing volume, the second light sensor having a second measurement sensitivity having a dependence on wavelength of the light measured and that differs from a dependence of the first measurement sensitivity on the wavelength of the light measured;
- and
- an analysis system coupled to receive a first stream of measurements from the first light sensor and a second stream of measurements of the second light sensor, the analysis system being configured to use the first stream and the second stream to identify types of particulates that interact with the beam.
2 more elements
Dependencies are inferred from the claim text.