Patent ID: 11901197
Assignee: TOKYO ELECTRON LIMITED
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A substrate processing apparatus comprising:
a processing container to which a supercritical fluid is supplied, the processing container being configured to dry a substrate by replacing a drying liquid collected on the substrate with the supercritical fluid;
a discharge line configured to discharge a mixed fluid containing the supercritical fluid and the drying liquid from an interior of the processing container;
a density meter installed in the discharge line and configured to detect a density of the mixed fluid flowing through the discharge line;
a first circuitry configured to calculate a reference density which is a density of the supercritical fluid having a temperature and a pressure that are the same as a temperature and a pressure of the mixed fluid flowing through the discharge line; and
a second circuitry configured to calculate a density difference between the density of the mixed fluid detected by the density meter and the reference density calculated by the first circuitry.