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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Environmental factors and hydrogen maser frequency stability.

¹Time and Frequency Division, 847.5, Boulder, CO 80303, USA. tparker@bldrdoc.gov

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|February 2, 2008

Summary

Understanding environmental effects on cavity-tuned hydrogen masers is key for frequency stability. Studies show masers maintain stability in controlled environments, minimizing fluctuations from temperature, humidity, and other factors.

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Area of Science:

Atomic physics and metrology
Precision measurement science

Background:

Cavity-tuned hydrogen masers are critical for precise timekeeping.
Environmental factors can impact maser frequency stability.
Minimizing common-mode frequency fluctuations is essential for optimal performance.

Purpose of the Study:

To investigate the environmental sensitivities of cavity-tuned hydrogen masers.
To determine the impact of environmental variations on maser frequency stability.
To assess the feasibility of operating masers in moderately controlled environments.

Main Methods:

Measurements of environmental sensitivities including temperature, relative humidity, atmospheric pressure, line voltage, and magnetic field.
Operation and monitoring of a cavity-tuned, active hydrogen maser at the National Institute of Standards and Technology.
Analysis of frequency stability data under varying environmental conditions.

Main Results:

The frequency stability of the hydrogen maser was not significantly degraded in a moderately controlled environment.
Observed environmental factors (temperature, humidity, pressure, voltage, magnetic field) had a negligible effect on common-mode frequency fluctuations.
The maser demonstrated robust performance under the tested environmental conditions.

Conclusions:

Cavity-tuned hydrogen masers can achieve optimal frequency stability in moderately controlled environments.
Common-mode frequency fluctuations due to typical environmental variations are negligible under such conditions.
The findings support the reliable operation of hydrogen masers for high-precision applications without extreme environmental controls.