銣原子氣體自旋噪聲譜測量的信噪比分析
發(fā)布時間：2018-08-07 08:09
【摘要】：自旋噪聲譜是一種非擾動的自旋動力學研究方法,通過探測系統(tǒng)在非激發(fā)條件下的自旋漲落,可以揭示系統(tǒng)在熱平衡狀態(tài)下的性質.因為系統(tǒng)在穩(wěn)態(tài)下的自旋漲落十分微弱,所以提高信噪比在自旋噪聲譜的測量中特別重要.本文采用頻譜儀、數據采集卡和實時傅里葉變換采集卡三種方法來測量銣原子氣體的自旋噪聲譜,并將實驗結果進行對比,分析了疊加次數、測量效率和采樣深度等因素對譜線信噪比的影響.實驗發(fā)現,譜線疊加次數對自旋噪聲譜的信噪比影響最為顯著,測量效率則能反映不同方法在相同的測量時間內得到的譜線質量,并比較了三種方法的測量效率,采樣深度的提高并不能明顯改善自旋噪聲譜的信噪比.相比于傳統(tǒng)的頻譜儀和數據采集卡,實時傅里葉變換采集卡的數據利用率和測量效率更高,從而具有更好的信噪比,非常有利于自旋噪聲譜在自旋動力學研究中的應用.
[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.
【作者單位】： 中國科學院半導體研究所超晶格國家重點實驗室;挪威科技大學海事技術與操作系;
【基金】：國家重點基礎研究發(fā)展計劃(批準號:2013CB922304) 國家自然科學基金(批準號:91321310,11404325)資助的課題~~
【分類號】：TB52
本文編號：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.
【作者單位】： 中國科學院半導體研究所超晶格國家重點實驗室;挪威科技大學海事技術與操作系;
【基金】：國家重點基礎研究發(fā)展計劃(批準號:2013CB922304) 國家自然科學基金(批準號:91321310,11404325)資助的課題~~
【分類號】：TB52
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