摘要:
Provided is a flow rate ratio control device that even in change periods during which the actual flow rates of component gases change along with a change in the target total flow rate or target mixing ratio of mixed gas, can keep the actual total flow rate or actual mixing ratio of the mixed gas constant. Target flow rates set in flow rate control devices have continuous change periods during which target flow rate values continuously change from pre-change to post-change target flow rate values, respectively and correspondingly; and the time lengths of the continuous change periods are set to at least a followable time during which a flow rate control device of which a response speed to an actual component fluid flow rate is lowest allows the actual component fluid flow rate to substantially follow the target flow rate in the continuous change periods.
摘要:
Provided is a capacitive pressure sensor that prevents not only a change in temperature but also electromagnetic noise in the air from affecting the measurement value of pressure. In the capacitive pressure sensor, an electrode member includes: a measurement electrode fixed to an insulating positioning member and having an electrode face; a signal extraction electrode fixed with an insulating seal sealing the other end of the body; and a flexible connection member for electrically connecting the measurement electrode and the signal electrode. Moreover, the flexible connection member is accommodated in the accommodating depressed portion formed in the measurement electrode or the signal extraction electrode.
摘要:
In order to keep a stable flow rate at a set flow rate value when a pressure fluctuation occurs in an upstream side of a valve, without providing an additional sensor for detecting a pressure fluctuation, a flow rate control apparatus is provided with: the valve; a flow rate sensor; a valve control part configured to control the valve so that a deviation between a set flow rate value and a measurement flow rate value is reduced, on the basis of the deviation and a set control coefficient; and a control coefficient setting part configured to set the control coefficient so that when a pressure rise occurs in the upstream side of the valve, a decreased amount in flow due to a decreased opening of the valve and an increased amount in flow due to an increased amount of a differential pressure before and after the valve, are balanced.
摘要:
The present invention intends to provide a Cp2Mg concentration measuring device capable of accurately measuring the concentration of Cp2Mg to be supplied to a process chamber without being affected by spontaneous decomposition, and is adapted to measure light intensity in a predetermined wavelength band around 12.8 μm and on the basis of the light intensity, calculate the concentration of Cp2Mg in a material gas.
摘要:
In order to make it possible to increase a diameter and output thereof, a diaphragm structure is provided that has low repulsiveness, can be largely deformed to increase a stroke even without being applied with a large force from an actuator, and is unlikely to give rise to a defect or fault even when formed thin, and a fluid control valve is provided with the diaphragm structure and the actuator that presses the diaphragm structure, wherein the diaphragm structure is provided with: a protruding part that is formed in a tubular shape and pressed by the actuator; a brim part that spreads from a base end of the protruding part outward with respect to the protruding part; and a support part that is formed on an outer circumference of the brim part and attached to another member, and the brim part is formed in a film shape.
摘要:
In order to attain a main objective of the present invention to provide an ion source capable of efficiently extracting ions, the ion source is configured to include: a conductive tubular body having an ion emitting aperture in a tip surface thereof and a penetration portion in a side wall thereof allowing thermo-electrons to pass through from an outside toward an inside; a mesh surrounding an outer periphery of the penetration portion; and a thermionic emission filament surrounding an outer periphery of the mesh, such that the thermo-electrons emitted from the thermionic emission filament pass through the mesh and reach the inside of the conductive tubular body through the penetration portion.
摘要:
A gas control system includes: a first valve that is provided in a carrier gas line or in a gas supply line; a flow rate control mechanism that is provided in a diluent gas line and includes a flow rate sensor and a second valve; a contactless type first concentration sensor; a first valve control part; a diluent gas setting flow rate calculation part adapted to, on the basis of a preset setting total flow rate of a post-dilution mixed gas and a post-dilution measured concentration, calculate a diluent gas setting flow rate that is a flow rate of a diluent gas to be flowed through the diluent gas line; and a second valve control part adapted to control the opening level of the second valve so as to decrease the deviation between the diluent gas setting flow rate and a measured flow rate measured by the flow rate sensor.
摘要:
To provide a gas chromatograph allowing a substance led out from a measurement target component to reach a reduction reaction part and capable of preventing occurrence of a quantification error while preventing corrosion and sensitivity deterioration of a metal pipeline due to measurement non-related components such as halogen, sulfur and the like. The gas chromatograph includes: an oxidation reaction part into which a sample gas passed through a column is introduced and which oxidizes the measurement target component and converts the resultant measurement target component to a prescribed intermediate component to be led out therefrom; and an intermediate gas flow path for deriving the intermediate component from the oxidation reaction part, and in this configuration, a reagent to be reacted with measurement non-related components is provided in the intermediate gas flow path, and the reagent contains a metal element to be reacted with only oxygen.
摘要:
A plate-type capillary column has extensibility that enables a capillary to be extended as a whole to improve resolution of a chromatograph by stacking respective plate-type capillary columns. The capillary column is provided with a plate having first and second face plate parts that face each other; a capillary that is formed inside the plate; a first bottom-equipped hole connected to one end part of the capillary and formed to open in the first face plate part; and a second bottom-equipped hole connected to the other end part and formed to open in the second face plate part, wherein as viewed from a direction vertical to the first face plate part or the second face plate part, on a capillary column first virtual circle, passing through the second bottom-equipped hole, one or more through-holes penetrating through the first face plate part and the second face plate part are formed.
摘要:
In order to, in a short period of time, reduce to zero a measured flow rate value measured after fully closing a fluid control valve, the fluid control valve having a configuration suitable to decrease the inside volume of the fluid control valve is configured together with a valve element member, and a valve seat block provided with: an in-valve flow path that is formed inside of the valve seat block; and a valve seat surface that is brought into contact with or separated from a seating surface of the valve element member is provided with a cutout that is formed in a part of a protruded rim so as to be communicatively connected to a downstream side flow path.