Progress in the Development of Hydrogen Masers

Vessot, R. F. C.; Levine, M. W.; Cutler, L.S.; Baker, Mohammad; Mueller, L.

doi:10.1109/freq.1968.199736

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…An account of its remarkable frequency stability and good accuracy, interest in the hydrogen maser [I] as a frequency standard [2,3,4,5,6] arose some years ago for applications as : very long base radioastronomy [7, 81, verification of the general theory of relativity [9, IO], navigation and space-craft tracking [3, 61. More recently, time comparisons between hydrogen masers and cesium beam frequency standards [11,121 have demonstrated the reliability of hydrogen masers as well as their ability to control the uniformity of time scales delivered by cesium beam frequency standards.…”

Section: Introductionmentioning

confidence: 99%

Development of Hydrogen Masers as Frequency Standards at the Laboratoire de l'Horloge Atomique

Petit¹,

Viennet²,

Barillet³

et al. 1974

Metrologia

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The main features of the design of two hydrogen masers in operation at the Laboratoire de l'Horloge Atomique are described.They show a frequency stability (square root of the Allan variance) of 4 × 10-13 × 1/τ for 1 s < τ < 40 s and 5 × 10-15 for 200 s < τ < 1 h.Results of time comparisons with distant Cs clocks are also given.The oscillation frequency has been extrapolated to zero magnetic field and a frequency offset, which depends on the value of the applied field, has been measured.

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Section: Introductionmentioning

confidence: 99%

Development of Hydrogen Masers as Frequency Standards at the Laboratoire de l'Horloge Atomique

Petit¹,

Viennet²,

Barillet³

et al. 1974

Metrologia

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An orbiting clock experiment to determine the gravitational red shift

Kleppner

Vessot

Ramsey

1970

Astrophys Space Sci

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Hydrogen‐Maser Time and Frequency Standard at Agassiz Observatory

Levine¹,

Vessot²

1970

Radio Science

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The maser is a compact unit, of relatively low power consumption, specifically designed for field use and readily transportable. A precision 5-MHz crystal oscillator, phase-locked to the maser, provides all frequency and = time references for the VLBI receivers, recorde.s, and clocks. The maser was tuned against a rubidium standard by .a rapid flux-switching technique; maser frequency resettability was estimated to-be approximately t3 x 10-13 with an overall accuracy of approximately t1 x 10-12.Loran-C was continuously monitored during the VLBI experiments, and the results of the Loran-C -maser compar i s-)ns are included. ItHydrogen-maser time and frequency standard at Agassiz observatory

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Progress in the Development of Hydrogen Masers

Cited by 4 publications

References 3 publications

Development of Hydrogen Masers as Frequency Standards at the Laboratoire de l'Horloge Atomique

Development of Hydrogen Masers as Frequency Standards at the Laboratoire de l'Horloge Atomique

An orbiting clock experiment to determine the gravitational red shift

Hydrogen‐Maser Time and Frequency Standard at Agassiz Observatory

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