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

Claim 7:
8. A program recording medium on which is recorded a program that is used in 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; and
a partial pressure measurement device that measures a partial pressure of a gas inside the chamber, and that is characterized in causing a computer to perform functions of:
an observer that is equipped with a model which estimates a state of the gas within the chamber, and that is formed such that an inflow flow rate of a gas flowing into the chamber and a measurement partial pressure 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 of
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.