铷原子自旋噪声谱分析中的窗口效应实验研究  

Experimental study on window effect of Rb atomic spin noise spectrum analysis

作　　者：孔嘉 汪孟珂 伏吉庆 刘浩 陆晓铭 Kong Jia;Wang Mengke;Fu Jiqing;Liu Hao;Lu Xiaoming(School of Science,Hangzhou Dianzi University,Hangzhou 310018,China;Magnetic Quality Laboratory,National Institute of Metrology,Beijing 100029,China)

机构地区：[1]杭州电子科技大学理学院,杭州310018 [2]中国计量科学研究院磁参量计量实验室,北京100029

出　　处：《河南师范大学学报（自然科学版）》2022年第4期8-13,F0002,共7页Journal of Henan Normal University(Natural Science Edition)

基　　金：国家自然科学基金(12005049,11935012);中国计量科学研究院重点专项(AKYZD1910-1)。

摘　　要：快速傅里叶变换是频谱分析的常用方法,但无法避免栅栏效应和频谐泄漏现象,导致频谱分析出现误差.通过加窗对信号进行时域处理,能够减少频谱泄露.由于不同窗函数对信号频谱产生的影响不同,会造成参数标定或信号估计的偏差,因此对窗口效应的研究非常必要.本文对铷原子在不同温度下的自旋噪声信号进行采集,并选取常用窗函数进行数据处理和分析,从而给出实验上的修正关系.这将为利用自旋噪声谱对原子系综进行标定和分析提供很好的参考和校准.Fast Fourier transform is a common method of spectrum analysis,but it can't avoid fence effect and frequency harmonic leakage,which will increase error in spectrum analysis.Window function is often applied before Fourier transform to reduce the spectrum leakage effect.There are various window functions having different effects on spectrum signal,which may lead to a wrong estimation of signal or parameters.Therefore,the study of window effect is necessary.In this paper,we collect rubidium spin noise signals under different temperature conditions for window effect study.The analysis resnlts with a few common window functions are showed and the experimental correction factors for each window function are proposed in this study.This work provides a good reference and useful correction factors for atomic ensemble studies by using spin noise spectrum.

关 键 词：自旋噪声谱 傅里叶变换 窗口效应 

分 类 号：O413[理学—理论物理]