| CPC C02F 1/32 (2013.01) [C02F 1/008 (2013.01); E03B 7/074 (2013.01); C02F 2201/326 (2013.01)] | 19 Claims |
|
1. A filtration apparatus comprising:
a flow path;
a valve provided on the flow path;
a first light source configured to emit a first light comprising ultraviolet (UV) light toward the flow path;
a second light source configured to emit a second light comprising visible light or infrared light toward the flow path;
a first optical sensor located out of a path of the first light and the second light;
electrodes provided for electrolyzing a liquid to produce a sterilizing solution to be introduced to the flow path; and
a processor electrically coupled to the valve, the first light source, the second light source, the first optical sensor and the electrodes, and configured to:
alternately operate the first light source to emit the first light and the second light source to emit the second light,
receive a first signal from the first optical sensor while the first light source emits the first light, and
control the valve and the electrodes to produce the sterilizing solution and introduce the sterilizing solution into the flow path based on the first signal,
wherein the first optical sensor comprises:
a photodiode;
a first sensing circuit configured to identify an instantaneous intensity of the first light or the second light based on an output current of the photodiode; and
a second sensing circuit configured to identify an accumulated intensity of the first light or the second light based on the output current of the photodiode.
|