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US 12,584,856 B2Granted
Dust sensor
AssigneesGwanak Analog CO., LTD., Seoul National University R&Db Foundation
InventorsSuhwan Kim, Hyunjoong Lee, Hyunjong Kim
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Abstract
A dust sensor includes a photo detector configured to detect light scattered from dust; and a signal processing circuit having a high-pass filter receiving an electric signal generated from output of the photo detector. The signal processing circuit generates a dust detection signal using a signal provided to the high-pass filter as well as a signal output from the high-pass filter.
Claims9
A dust sensor comprising:
- a photo detector configured to detect light scattered from dust;
- and
- a signal processing circuit including a high-pass filter receiving an electric signal generated from output of the photo detector,
- wherein the signal processing circuit generates a dust detection signal using a signal provided to the high-pass filter as well as a signal output from the high-pass filter,
- wherein the signal processing circuit generates an offset signal in a dust-free state,
- generates a signal corresponding to high density dust using the signal provided to the high-pass filter and the offset signal, and generates a signal corresponding to low density dust using output of the high-pass filter, wherein the signal corresponding to high density dust and the signal corresponding to low density dust are based on a size of the dust using magnitude, direction of change, or duration of the signal corresponding to high density dust and the signal corresponding to low density dust.
3 more elements
Dependencies are inferred from the claim text.