NDLI: Alkali pressure shifts and their temperature dependence: Measurements with the Rb isoclinic point

Content Provider	IEEE Xplore Digital Library
Author	Wells, N. Driskell, T. Camparo, J.
Copyright Year	2014
Description	Author affiliation: Photonics Technol. Dept., Aerosp. Corp., El Segundo, CA, USA (Wells, N.; Driskell, T.; Camparo, J.)
Abstract	Accurately assessing temperature variations of vapor-phase systems is a non-trivial problem, and one that has significant implications for the long-term stability of atomic frequency standards. As an example, consider the straightforward case of attempting to measure and stabilize the vapor temperature of Rb in a gas-cell atomic clock. Routinely, the temperature of the vapor is measured by placing a thermocouple or thermistor at the cold point of the resonance cell's exterior (i.e., the region of the liquid Rb pool). As a consequence of vapor-phase/condensed-phase equilibrium, this temperature defines the Rb vapor density and by implication its mean kinetic energy. However, using a temperature probe in this manner has at least two problems: 1) the temperature of the vapor is not measured directly, only the temperature at a point on the exterior of the vapor's glass container is measured, and 2) the temperature gradients that likely exist over the vapor's volume are ignored. One can, of course, place additional probes on the cell's exterior, but this still leaves the question of how cell-exterior temperature gradients map to interior-vapor gradients. Therefore, in order to improve the long-term stability of next-generation atomic clocks, there is a need for more accurate means of assessing actual vapor temperatures.
Sponsorship	IEEE Ultrason., Ferroelectr., Freq. Control Soc.
Starting Page	1
Ending Page	1
File Size	94610
Page Count	1
File Format	PDF
ISBN	9781479949151
DOI	10.1109/FCS.2014.6859964
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-05-19
Publisher Place	Taiwan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature measurement Temperature sensors Atomic clocks Pressure measurement Stability criteria Thermal stability Probes
Content Type	Text
Resource Type	Article

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