The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform

V V Kuzmin - One of the best experts on this subject based on the ideXlab platform.

  • method of determining the relative sensitivity of thermal Vacuum Gages to different gases
    Measurement Techniques, 1997
    Co-Authors: V V Kuzmin
    Abstract:

    A new method is described for determining the relative sensitivity of thermal Vacuum Gages and their sensors (tranducers) to different gases. The method is based on compensation for the change in the transducer signal caused by the use of a gas other than nitrogen or air and by variation of the volume of the measurement chamber. This approach makes it possible to avoid some of the errors intrinsic to measurements of low pressures and small increments in the transducer signal. A Vacuum system configuration that allows the given method to be realized is described.

Nasa - One of the best experts on this subject based on the ideXlab platform.

  • Volume-ratio calibration system for Vacuum Gages
    2019
    Co-Authors: Nasa
    Abstract:

    Volume-ratio calibration system consists of a gas source, high pressure gauge, small volume tank, large volume chamber, plus appropriate piping, valves, and Vacuum source. This system used in conjunction with commercial Vacuum gauges evaluates its ability to accurately produce desired pressures in the .000001 to .01 torr range.

J. R. Sweda - One of the best experts on this subject based on the ideXlab platform.

  • Development of a primary standard ultrahigh Vacuum calibration station
    Journal of Vacuum Science and Technology, 1994
    Co-Authors: P. D. Levine, J. R. Sweda
    Abstract:

    The Metrology Laboratories at Lockheed Missiles & Space Company (LMSC) are required to calibrate a variety of Vacuum Gages in support of research programs and manufacturing processes. Currently, primary standards for this purpose are obtained through calibration at the National Institute of Standards and Technology (NIST), which is a costly and time‐consuming process. In an effort to reduce the reliance on external sources of calibration, this laboratory has developed an ultrahigh Vacuum primary standard. A constant‐volume, pressure drop flow meter designed at LMSC is used to generate a known flow rate of gas in a Vacuum chamber partitioned by an orifice of calculated conductance. The pressure drop across the orifice at constant flow uniquely defines chamber pressure as a function of flow rate while in molecular flow. This constitutes a Vacuum standard relying on dimensional, volumetric ratio, and differential pressure measurements only. The system was designed for use in realizing absolute pressures in t...

P. D. Levine - One of the best experts on this subject based on the ideXlab platform.

  • Development of a primary standard ultrahigh Vacuum calibration station
    Journal of Vacuum Science and Technology, 1994
    Co-Authors: P. D. Levine, J. R. Sweda
    Abstract:

    The Metrology Laboratories at Lockheed Missiles & Space Company (LMSC) are required to calibrate a variety of Vacuum Gages in support of research programs and manufacturing processes. Currently, primary standards for this purpose are obtained through calibration at the National Institute of Standards and Technology (NIST), which is a costly and time‐consuming process. In an effort to reduce the reliance on external sources of calibration, this laboratory has developed an ultrahigh Vacuum primary standard. A constant‐volume, pressure drop flow meter designed at LMSC is used to generate a known flow rate of gas in a Vacuum chamber partitioned by an orifice of calculated conductance. The pressure drop across the orifice at constant flow uniquely defines chamber pressure as a function of flow rate while in molecular flow. This constitutes a Vacuum standard relying on dimensional, volumetric ratio, and differential pressure measurements only. The system was designed for use in realizing absolute pressures in t...

D.j. Santeler - One of the best experts on this subject based on the ideXlab platform.

  • Vacuum Process Evaluation
    Fundamental Problems in Vacuum Techniques Ultra-High Vacuum, 2013
    Co-Authors: D.j. Santeler
    Abstract:

    Vacuum process evaluation is a new technique to (1) Determine the outgassing occurring within a Vacuum system as a continuous function of time, and (2) Analyze the resulting curve to obtain information as to the source and nature of the outgassing. The report describes this technique and its application in determining the optimum combination of such parameters as temperature, time, materials, restrictions, and pumps on such processes as hermetic volume exhaust and cellulose dehydration. Vacuum process evaluation has also been used to study such phenomena as the outgassing characteristics of insulating materials and Vacuum Gages, the flow of gases through orifices and short tubes, and the gettering action of various materials. A digital computer and data reduction facilities have been incorporated to eliminate the detailed hand calculations and plotting. This has resulted in a rapid and inexpensive method for the study of Vacuum engineering problems.