Patent ID: 11906984
Assignee: HORIBA STEC, CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A concentration control system comprising:
a flow rate control device that is provided on a supply flow path that supplies gas to an interior of a chamber, and performs control such that a flow rate of a gas flowing through this supply flow path matches a set flow rate that has been input;
a partial pressure measurement device that measures a partial pressure of a gas inside the chamber;
an observer that is equipped with a model which estimates a state of the gas inside the chamber, and that is formed such that an inflow flow rate of a gas flowing into the chamber and measurement partial pressures from the partial pressure measurement device are input into the model, and an estimated partial pressure of the gas within the chamber is output; and
a controller that, based on a set partial pressure and on the estimated partial pressure of the gas within the chamber output by the observer, sets the set flow rate in the flow rate control device.