铷原子气体自旋噪声谱测量的信噪比分析
发布时间：2018-08-07 08:09
【摘要】：自旋噪声谱是一种非扰动的自旋动力学研究方法,通过探测系统在非激发条件下的自旋涨落,可以揭示系统在热平衡状态下的性质.因为系统在稳态下的自旋涨落十分微弱,所以提高信噪比在自旋噪声谱的测量中特别重要.本文采用频谱仪、数据采集卡和实时傅里叶变换采集卡三种方法来测量铷原子气体的自旋噪声谱,并将实验结果进行对比,分析了叠加次数、测量效率和采样深度等因素对谱线信噪比的影响.实验发现,谱线叠加次数对自旋噪声谱的信噪比影响最为显著,测量效率则能反映不同方法在相同的测量时间内得到的谱线质量,并比较了三种方法的测量效率,采样深度的提高并不能明显改善自旋噪声谱的信噪比.相比于传统的频谱仪和数据采集卡,实时傅里叶变换采集卡的数据利用率和测量效率更高,从而具有更好的信噪比,非常有利于自旋噪声谱在自旋动力学研究中的应用.
[Abstract]:The spin noise spectrum is a non-perturbed spin dynamics study method. By detecting the spin fluctuation of the system under the condition of non-excitation, the properties of the system in the thermal equilibrium state can be revealed. It is very important to improve the signal-to-noise ratio (SNR) in the measurement of spin noise spectrum because the spin fluctuation of the system is very weak in steady state. In this paper, the spin noise spectrum of rubidium atomic gas is measured by means of spectrometer, data acquisition card and real time Fourier transform acquisition card. The experimental results are compared and the superposition times are analyzed. The influence of measurement efficiency and sampling depth on SNR of spectral line. It is found that the frequency of line superposition has the most significant effect on the SNR of the spin noise spectrum, and the measurement efficiency can reflect the spectral quality obtained by different methods in the same measuring time, and the measurement efficiency of the three methods is compared. The signal to noise ratio of spin noise spectrum can not be improved obviously by increasing sampling depth. Compared with the traditional spectrometer and data acquisition card, the real-time Fourier transform acquisition card has higher data utilization and measurement efficiency, which has better signal-to-noise ratio, which is very beneficial to the application of spin noise spectrum in spin dynamics research.
【作者单位】： 中国科学院半导体研究所超晶格国家重点实验室;挪威科技大学海事技术与操作系;
【基金】：国家重点基础研究发展计划(批准号:2013CB922304) 国家自然科学基金(批准号:91321310,11404325)资助的课题~~
【分类号】：TB52
本文编号：2169412
[Abstract]:The spin noise spectrum is a non-perturbed spin dynamics study method. By detecting the spin fluctuation of the system under the condition of non-excitation, the properties of the system in the thermal equilibrium state can be revealed. It is very important to improve the signal-to-noise ratio (SNR) in the measurement of spin noise spectrum because the spin fluctuation of the system is very weak in steady state. In this paper, the spin noise spectrum of rubidium atomic gas is measured by means of spectrometer, data acquisition card and real time Fourier transform acquisition card. The experimental results are compared and the superposition times are analyzed. The influence of measurement efficiency and sampling depth on SNR of spectral line. It is found that the frequency of line superposition has the most significant effect on the SNR of the spin noise spectrum, and the measurement efficiency can reflect the spectral quality obtained by different methods in the same measuring time, and the measurement efficiency of the three methods is compared. The signal to noise ratio of spin noise spectrum can not be improved obviously by increasing sampling depth. Compared with the traditional spectrometer and data acquisition card, the real-time Fourier transform acquisition card has higher data utilization and measurement efficiency, which has better signal-to-noise ratio, which is very beneficial to the application of spin noise spectrum in spin dynamics research.
【作者单位】： 中国科学院半导体研究所超晶格国家重点实验室;挪威科技大学海事技术与操作系;
【基金】：国家重点基础研究发展计划(批准号:2013CB922304) 国家自然科学基金(批准号:91321310,11404325)资助的课题~~
【分类号】：TB52
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