Continuous Liquid Level Measurements with Time-Domain Reflectometry

  • J. E. Cruz
  • E. H. Rogers
  • A. E. Heister
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 18)


This presentation shows how a time-domain reflectometer [1–4] provides a simple yet accurate method for making liquid level measurements of cryogenic fluids. Measurement of cryogenic liquid levels in storage vessels has generally been performed with discrete sensors arranged in a ladder configuration. The accuracy of this technique is determined by the spacing of the sensors and their response time.


liqUid Level Counter Interval Oscilloscope Display Ofthe Probe Zone Sensor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    R. Carlson, S. Krakaver, R. Monnier, V. Von Duzer, and R. Woodbury, “Sampling Oscillography,” Hewlett Packard Applications Note 52 (November 1959).Google Scholar
  2. 2.
    Time Domain Reflectometry,“ Hewlett Packard Applications Note 62 (1964).Google Scholar
  3. 3.
    Pulse Reflection Measurement of Transmission Line Impedance and Discontinuities,“ Company publication, Tektronix (1962).Google Scholar
  4. 4.
    Cable Testing with Time Domain Reflectometry,“ Hewlett Packard Applications Note 76 (1965).Google Scholar
  5. 5.
    W. L. Willis, in: Advances in Cryogenic Engineering, Vol. 12, Springer Science+Business Media New York (1966), p. 666.Google Scholar
  6. 6.
    W. L. Willis and J. F. Taylor, “Time Domain Reflectometry for Liquid Hydrogen Level Detection,” LA-3474-MS, Unclassified Report, Los Alamos Scientific Laboratory, Los Alamos, New Mexico (February 1966).Google Scholar

Copyright information

© Springer Science+Business Media New York 1973

Authors and Affiliations

  • J. E. Cruz
    • 1
  • E. H. Rogers
    • 1
  • A. E. Heister
    • 1
  1. 1.Cryogenics DivisionNBS Institute for Basic StandardsBoulderUSA

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