Patent ID: 11879839
Assignee: TOKYO ELECTRON LIMITED
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G

Claim 16:
17. A substrate processing method performed in a substrate processing apparatus,
wherein the substrate processing apparatus includes:
a supply channel through which a liquid to be supplied to a substrate flows; and
a foreign substance detecting unit configured to detect a foreign substance in the liquid based on a signal obtained when light, which is near-infrared light, is radiated toward a flow path forming unit constituting a part of the supply channel by a light projector so that light is emitted from the flow path forming unit and a light receiver receives the light emitted from the flow path forming unit,
wherein the substrate processing method includes:
generating light toward the flow path forming unit constituting the part of the supply channel by the light projector;
receiving light emitted from the flow path forming unit by the light receiver as a result of the generating of the light toward the flow path forming unit; and
detecting a foreign substance in the liquid based on a signal obtained by the receiving of the light,
wherein the light projector and the light receiver in the foreign substance detecting unit are provided in areas that do not face each other among up/down, left/right and front/rear areas with respect to the flow path forming unit such that the light receiver receives scattered light as the light emitted from the flow path forming unit.