Patent ID: 11938500
Assignee: TOKYO ELECTRON LIMITED
Field: Measurement (Instruments)
Classification: CPC B  G | IPC B  G

Claim 10:
11. A method for determining a deterioration degree of conductivity of a conductive pipe in a substrate processing apparatus including:
a substrate holder configured to hold and process a substrate;
a nozzle configured to eject a processing liquid to the substrate held by the substrate holder;
the conductive pipe connected to the nozzle and configured to supply the processing liquid to the nozzle;
a ground line that connects the conductive pipe and a reference potential; and
a liquid receiver provided around the substrate holder and configured to receive the processing liquid ejected from the nozzle,
the method comprising:
imparting a potential difference between a liquid contact surface of the liquid receiver and the reference potential;
supplying a measurement liquid to the conductive pipe thereby ejecting the measurement liquid from the nozzle to the liquid receiver; and
when the measurement liquid is ejected from the nozzle to the liquid receiver, measuring a current value of a current flowing through a charge moving path established via the measurement liquid between the liquid contact surface of the liquid receiver and the ground line.