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US 9,470,627 B2Granted
Detection of particle characteristics
AssigneeXtralis Technologies Ltd.
InventorsBrian Alexander, Nitin Vayeda, Kemal Ajay
Life of this patent
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Abstract
A method of detecting particles in an air flow is described. The method includes receiving a signal indicative of light intensity scattered from the air flow at a plurality of wavelengths and processing the signal indicative of the intensity of received light at each of the wavelengths and a corresponding wavelength dependent parameter to generate an output signal indicative of at least one characteristic of particles in the air flow. A particle detection system is also described.
Claims7
A particle detection system for including:
- a detection chamber adapted to receive an air sample;
- first particle detection means including a first light source for illuminating a first volume of the air sample at at least a first wavelength, and a first light receiver having a field of view intersecting with the first volume for receiving light scattered from the detection chamber and outputting a first signal indicative of the scattered received light;
- second particle detection means including a second light source for illuminating a second volume of the air sample at at least a second wavelength, and a second light receiver having a field of view intersecting with the second volume for receiving light scattered from the detection chamber and outputting a second signal indicative of the scattered received light;
- light source activation means adapted to selectively activate the first light source in a first time period and the second light source in a second time period;
- and
- processing means adapted to receive a first signal from the first light receiver and a second signal from the second light receiver corresponding to the first time period and process the received signals to generate a first output corresponding to the first time period corrected for background light;
- and to receive a first signal from the first light receiver and a second signal from the second light receiver corresponding to the second time period and process the received signals to generate a second output corresponding to the second time period that is corrected for background light.
4 more elements
Dependencies are inferred from the claim text.