Patent ID: 11880213
Assignee: TOKYO ELECTRON LIMITED
Field: Measurement (Instruments)
Classification: CPC G  B  H | IPC B  G  H

Claim 0:
1. A substrate liquid processing apparatus comprising:
at least one liquid pipe through which a processing liquid flows;
a discharge nozzle configured to discharge the processing liquid supplied via the at least one liquid pipe;
a valve mechanism configured to regulate a flow of the processing liquid in the at least one liquid pipe;
a liquid detection sensor configured to detect presence or absence of the processing liquid in the at least one liquid pipe; and
a controller programmed to execute:
regulating, by the valve mechanism, the flow of the processing liquid to fill a first pipe measurement site of the at least one liquid pipe with the processing liquid and then to retract the processing liquid to an upstream side of the first pipe measurement site in the at least one liquid pipe;
stopping the regulating the flow of the processing liquid when the processing liquid is located only upstream of the first pipe measurement site in the at least one liquid pipe; and
while the regulating the flow of the processing liquid is stopped, detecting, by the liquid detection sensor, the presence or absence of the processing liquid at the first pipe measurement site located at a first measurement point,

wherein the at least one liquid pipe includes a plurality of liquid pipes, and each of the plurality of liquid pipes is provided so as to be movable relative to the liquid detection sensor, and
wherein when the first pipe measurement site in each of the plurality of liquid pipes passes through the first measurement point, the liquid detection sensor detects the presence or absence of the processing liquid in the first pipe measurement site of each of the plurality of liquid pipes.