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

Claim 14:
15. A substrate processing apparatus, comprising:
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 flow path forming unit includes multiple flow path forming units, and a row of the multiple flow path forming units is formed in a direction different from an arrangement direction of the light projector and the light receiver with respect to one flow path forming unit,
the light receiver and the light projector are shared by the multiple flow path forming units, and
a moving mechanism configured to move the light receiver and the light projector along the row of the multiple flow path forming units such that the light receiver and the light projector are located at a position corresponding to the flow path forming unit selected from the multiple flow path forming units is provided.