参考微波场强度对里德堡原子天线测量结果的影响
The influence of reference microwave field intensity on the measurement results of the Rydberg atomic antenna
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摘要: 里德堡原子天线因其固有的高精度、超宽带信号接收能力、量值自溯源性等优势已逐渐展现出了巨大的应用前景。文中主要讨论了超外差法下参考场强度对里德堡原子天线测量结果的影响,发现只有在施加较小的目标信号时,其同所测混频信号间呈良好的线性关系,且该线性关系始终存在,与参考场强弱无关,而当目标信号过大,此时两者线性关系会被破坏;同时,确定了参考场场强和混频频率两者均将影响系统探测外部微波场的能力,实验中发现当逐渐增强参考信号,系统测量能力呈现先增后减的趋势(本文中在PL=0dBm左右达到最优条件),而对于混频频率而言,系统测量能力将伴随其不断增大而减弱;此外,还分析了目标信号与EIT谱A-T劈裂裂距之间存在对数相关,并通过实验进行了验证,结果显示与推导的公式相符合。Abstract: The Rydberg atomic antenna has gradually shown great application prospects due to its inherent advantages such as high precision, ultra wideband signal reception ability, and self value traceability. This paper mainly discusses the influence of reference field intensity on the measurement results under superheterodyne. We found only when a small target signal is applied, there is a good linear relationship between target signal and mixing signal, which is not related to the strength of reference field, and large target signal can lead to system entering the nonlinear region. Meanwhile, we determine both the reference field strength and the mixing frequencies will affect the system's ability to detect external microwave fields, we found that as the reference signal gradually increases, the system's measurement capability exhibits an increasing and then decreasing trend(The optimal value of this paper is around ), and for the mixing frequency, the system's measurement capability diminishes as it continues to increase. Besides, we analyzed the logarithmic relationship between the target signal and the A-T splitting distance of the EIT, and verified it through experiments.