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Pressure sensitivity of the vapor-cell atomic clock

机译:蒸气室原子钟的压力敏感性

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摘要

Although atomic clocks have very low levels of frequency instability, they are nonetheless sensitive (albeit slightly) to various environmental parameters, including temperature, power supply voltage, and dc magnetic fields. In the terrestrial environment, however, atmospheric pressure (i.e., the air's molecular density) is not generally included in this list, because the air's density variations near the surface of the Earth will typically have a negligible effect on the clock's performance. The situation is different, however, for clocks onboard satellites like Galileo, where manufacturing and testing are done at atmospheric pressure, while operation is in vacuum. The pressure sensitivity of atomic clocks, in particular vapor-cell atomic clocks, can therefore be of significance. Here, we discuss some of the ways in which changes in atmospheric pressure affect vapor-cell atomic clocks, and we demonstrate that, for one device, the pressure-sensitivity traces back to a pressure-induced change in the temperature of the clock's filter and resonance cells.
机译:尽管原子钟的频率不稳定程度非常低,但它们对各种环境参数(包括温度,电源电压和直流磁场)敏感(尽管有一点点)。但是,在陆地环境中,大气压力(即空气的分子密度)通常不包括在此列表中,因为空气在地球表面附近的密度变化通常对时钟性能的影响可忽略不计。但是,对于像伽利略(Galileo)这样的人造卫星上的钟表,情况就不同了,在那里制造和测试是在大气压下进行的,而操作则是在真空中进行的。因此,原子钟,尤其是蒸气室原子钟的压力敏感性很重要。在这里,我们讨论了大气压力变化影响蒸气电池原子钟的一些方式,并且我们证明了,对于一种设备,压敏性可追溯到压力引起的钟表过滤器和温度的变化。共振细胞。

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