摘要:
The present invention relates to an apparatus for measuring pressure inside a predetermined vessel based on the principle that the transmitting efficiency of ultrasonic waves is changed by acoustic impedance variation according to an internal pressure. The apparatus includes an ultrasound exciting unit 20 disposed inside the vessel 10 and generating predetermined ultrasonic waves, an ultrasound receiving unit 30 disposed inside the vessel 10 and placed on the same axis line as that of the ultrasound exciting unit 20, a control unit 70 for controlling a frequency and a waveform of the excitation signal transmitted into the ultrasound exciting unit 20, and a pressure measuring unit 80 for measuring an internal pressure of the vessel 10 based on an ultrasonic signal received by the ultrasound receiving unit 30 and the excitation signal transmitted into the ultrasound exciting unit 20.
摘要:
The present invention relates to an apparatus for measuring pressure inside a vessel using a magnetostrictive acoustic transducer. The apparatus includes a magnetostrictive acoustic transducer, including an exciting coil unit wound on a first magnetization yoke disposed on an outer position of a vessel, a receiving coil unit wound on the first magnetization yoke, and a vibration unit disposed on an inner position of the vessel in which the first magnetization yoke is installed; a control unit for supplying a predetermined excitation current signal to the exciting coil unit; and a pressure measuring unit for measuring an internal pressure of the vessel based on an ultrasonic wave signal received by the receiving coil unit and an excitation current signal into the exciting coil unit.
摘要:
Disclosed therein is apparatus and method for in-situ calibration of a vacuum gauge by absolute method and comparison method, which can carry out absolute calibration using a static type standard for measuring pressures of vacuum chambers by expanding and moving gas to the vacuum chambers of different volumes in order and comparison calibration of vacuum gauges in an in-situ state without movement of the vacuum gauges according to a method for controlling gas flow through an orifice using a calibrated standard vacuum gauge. The present invention includes a technology for combining an absolute calibration of a standard vacuum gauge by a static method and a comparative calibration of a vacuum gauge by a method for controlling a gas flow through an orifice, technologies for generating and calibrating standard pressure from a low vacuum to a high vacuum, and a technology of comparative calibration of the vacuum gauge by a method for stabilizing the gas flow through the orifice. So, the absolute calibration and the comparative calibration of the vacuum gauges which have been separately carried out by different apparatuses till now can be carried out by just one apparatus, whereby economical efficiency and convenience in calibration of vacuum gauges are maximized.
摘要:
Disclosed herein are an apparatus for and method of measuring the composition and the pressure of the discharged gas from an ion gauge by using a residual gas analyzer. In this regard, there are provided a vacuum container 200 divided into a pressure container 210 and a discharge container 220 by means of a partition 235 having an orifice 230 formed thereon; an ion gauge 100 mounted at the pressure container 210 side of the vacuum container 200 for discharging the gas at the time of vacuum formation; a residual gas analyzer 240 mounted at the pressure container 210 side of the vacuum container 200 for measuring the composition and the pressure of the residual gas; pump means disposed at one side of the discharge container 220 of the vacuum container 200 for discharging the inside gas; and heating means disposed at the vacuum container 200 for heating the vacuum container 200 to a predetermined temperature.
摘要:
Disclosed is a pressure measuring system for a vacuum chamber, in particular, a pressure measuring system for a vacuum chamber using ultrasonic wave. In this regard, there is provided a pressure measuring system for a vacuum chamber using ultrasonic wave, comprising a vacuum chamber 10 formed with desired vacuum at the inside thereof; ultrasonic wave-emitting means mounted close to an outer peripheral surface of the vacuum chamber 10 for emitting an ultrasonic wave 62 to the inside of the vacuum chamber 10; ultrasonic wave-receiving means for receiving a reflection wave 64 reflected after the striking of the ultrasonic wave 62 emitted from the ultrasonic wave-emitting means to the vacuum chamber; reflection wave-detecting means for detecting the reflection wave 64 from the ultrasonic wave-receiving means; and amplitude-analyzing means for analyzing the amplitude of the reflection wave 64 detected by the reflection wave-detecting means.
摘要:
An apparatus and method for in-situ calibration of a vacuum gauge by absolute method and comparison method, which can carry out absolute calibration using a static type standard for measuring pressures of vacuum chambers by expanding and moving gas between four vacuum chambers of different volumes in order, and comparison calibration of vacuum gauges in an in-situ state without movement of the vacuum gauges according to a method for controlling gas flow through an orifice using a calibrated standard vacuum gauge. Thus, the absolute calibration and the comparative calibration of the vacuum gauges which have been separately carried out by different apparatuses till now can be carried out by just one apparatus, whereby economical efficiency and convenience in calibration of vacuum gauges are maximized.
摘要:
Disclosed herein are an apparatus for and method of measuring the composition and the pressure of the discharged gas from an ion gauge by using a residual gas analyzer. In this regard, there are provided a vacuum container 200 divided into a pressure container 210 and a discharge container 220 by means of a partition 235 having an orifice 230 formed thereon; an ion gauge 100 mounted at the pressure container 210 side of the vacuum container 200 for discharging the gas at the time of vacuum formation; a residual gas analyzer 240 mounted at the pressure container 210 side of the vacuum container 200 for measuring the composition and the pressure of the residual gas; pump means disposed at one side of the discharge container 220 of the vacuum container 200 for discharging the inside gas; and heating means disposed at the vacuum container 200 for heating the vacuum container 200 to a predetermined temperature.
摘要:
The present invention discloses a device for measuring and monitoring electron density of plasma. The device includes a chamber filled with plasma having varying electron density; a frequency probe having transmission/receiving antennas and a pair of waveguides, one end of which is mounted in the chamber, for radiating and receiving electromagnetic waves; an electromagnetic wave generator electrically connected to one of the waveguides of the frequency probe for generating electromagnetic waves; and a frequency analyzer for scanning the frequency of received electromagnetic waves and analyzing the scanned frequency with respect to the amplitude of the received electromagnetic waves. Coupled to the rear end of the frequency probe is preferably a transfer unit having a hydraulic cylinder structure such that the frequency probe is moved in the chamber to detect the spatial distribution of electron density.
摘要:
The present invention relates to a capacitance type pressure measurement apparatus by using a diaphragm, and more specifically to an apparatus for measuring pressure by using a diaphragm capable of measuring pressure of atmospheric pressure or less as well as pressure of atmospheric pressure or more without having a getter pump by fixedly mounting a pressure variable container on a sensor housing having a diaphragm mounted therein.
摘要:
The present invention relates to a capacitance type pressure measurement apparatus by using a diaphragm, and more specifically to an apparatus for measuring pressure by using a diaphragm capable of measuring pressure of atmospheric pressure or less as well as pressure of atmospheric pressure or more without having a getter pump by fixedly mounting a pressure variable container on a sensor housing having a diaphragm mounted therein.