Apparatus to provide a time reference
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United States of America Patent
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Jul 14, 2015
Grant Date -
Jun 19, 2014
app pub date -
Dec 13, 2012
filing date -
Dec 13, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
Apparatus to provide a time reference are disclosed herein. An example apparatus disclosed herein includes a resonator. A first cap is coupled to a first side of the resonator to define a first cavity, and a second cap is coupled to a second side of the resonator to define a second cavity. The first cavity and the second cavity provide a first vacuum in which the resonator is to resonate. The resonator, the first cap and the second cap have substantially identical thermal expansion coefficients. The example apparatus also includes a vacuum chamber surrounding the resonator, the first cap and the second cap. The vacuum chamber is to provide a second vacuum in which the resonator, the first cap and the second cap are disposed. A frequency of resonance of the resonator in the first vacuum is to provide a time reference.
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International Classification(s)
- H03L:AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR S....
- H01L:SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICE....
- H02N:ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H03B:GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUEN....
- H03H:IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONA....
- E21B:EARTH OR ROCK DRILLING
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