Development of a microwave-type densimeter for slush hydrogen

K. Ohira, K. Nakamichi, Y. Kihara

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Slush hydrogen is a two-phase solid-liquid cryogenic fluid consisting of solid hydrogen particles in liquid hydrogen, various applications for which are anticipated, including fuel for reusable space shuttles. The authors of the current study have measured the density of slush hydrogen by using the phase shift that takes place when microwaves are propagated through slush hydrogen, i.e., using the change in the specific dielectric constant. This new technique, unlike the conventional method using a waveguide and horn antenna, features a coaxial cable and patch antenna that can be used at cryogenic temperatures, leading to the development of a slush hydrogen densimeter with a high accuracy of within ±0.5%.

Original languageEnglish
Pages (from-to)615-620
Number of pages6
Issue number10-11
Publication statusPublished - 2003 Oct 1


  • Densimeter
  • Liquid fuel
  • Liquid hydrogen
  • Microwave
  • Slush hydrogen
  • Solidification

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)


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