低频段低噪声电压基准源的电压噪声测试与表征  

Noise Characterization of Low Noise Voltage Reference at Low Frequency Band

作　　者：赵子琳 李番 李瑞鑫 武志学 尹王保[2,4] 杨荣草 田龙[1,4] ZHAO Zi-lin;LI Fan;LI Rui-xin;WU Zhi-xue;YIN Wang-bao;YANG Rong-cao;TIAN Long(State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China;Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,China;School of Physical and Electronic Engineering,Shanxi University,Taiyuan 030006,China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学光电研究所,量子光学与光量子器件国家重点实验室,山西太原030006 [2]山西大学,激光光谱研究所,山西太原030006 [3]山西大学,物理电子工程学院,山西太原030006 [4]山西大学,极端光学协同创新中心,山西太原030006

出　　处：《量子光学学报》2022年第1期1-7,共7页Journal of Quantum Optics

基　　金：国家重点研发计划(2020YFC2200402);国家自然科学基金(62027821,11654002,11874250,62035015,12174234);山西省重点研发计划(201903D111001)。

摘　　要：空间引力波探测面向0.1 mHz~1 Hz频段引力波信号,在此频段内包含了更大特征质量和尺度的波源信息。目前的空间引力波探测计划都采用大型激光干涉仪装置进行探测,其中激光光源系统以及无拖曳系统等关键部件的灵敏度都依赖于极低的电学噪声,然而极低电学噪声受限于航天器上电压基准源的噪声水平,这就需要研发低噪声电压基准源并对激光强度噪声及关键电学器件的电学噪声进行低频段噪声表征。本文通过选定低噪声基准芯片,并设计相关外围电路、仿真模拟、电磁屏蔽、采用低温漂系数元件、低噪声供电以及主动温控等技术手段实现了低噪声基准电压源的研制。由于0.1 mHz~1 Hz频段无法用现有商用设备进行此全频段噪声分析,我们利用高精度数字万用表进行基准源输出电压的测试与采集,并采用快速傅里叶变换法以及对数轴功率谱密度法将采集的数据进行计算处理,得到所研发电压基准在0.01 mHz~1 Hz频段的电压噪声谱密度。实验结果表明电压噪声谱密度在0.01 mHz时达到1.85×10^(−3)V/Hz^(1/2),在0.1 mHz~1 Hz的频率范围内在4.89×10^(−4)V/Hz^(1/2)以下。此低噪声电压基准源的研发及其噪声评估为空间引力波探测中激光强度噪声抑制等方面提供关键器件支撑。Space gravitational wave detection is oriented to gravitational wave signals in 0.1 mHz~1 Hz band,which contains wave source information of larger characteristic mass and scale.The current space gravitational wave detection plans use large laser interferometer devices to detect,in which the sensitivity of key components,such as the laser light source system and the drag-free system,depends on extremely low electrical noise,which is limited by the noise level of the voltage reference source on the spacecraft.Therefore,it is necessary to develop low noise voltage reference and perform low-frequency noise characterization of laser intensity noise and electrical noise of key electrical devices.In this paper,the development of low noise voltage reference source is realized by selecting a low noise reference chip,designing relevant peripheral circuits,simulation,electromagnetic shielding,using low temperature drift factor element,low noise power supply and active temperature control.Since existing commercial equipment cannot be used for noise analysis in the 0.1 m Hz~1 Hz band,we use a high-precision digital multimeter to test and collect the output voltage of the voltage reference source under different environmental conditions,including free operation,external shielding shell,external temperature control and shielding temperature control,and use fast Fourier transform method and logarithmic power spectral density method to calculate and process the collected data.The voltage noise spectral density of the developed voltage reference in the 0.01 mHz~1 Hz band is obtained.The experimental results show that the spectrum density reaches 1.85×10^(−3)V/Hz^(1/2) at 0.01 m Hz,and less than 4.89×10^(−4)V/Hz^(1/2) in the frequency range of 0.1 mHz~1 Hz.The development of this low noise voltage reference source and its noise evaluation provide a key device support in terms of laser intensity noise suppression in space gravitational wave detection.

关 键 词：空间引力波探测 电压基准源 电压噪声表征 对数轴谱密度算法 

分 类 号：O572[理学—粒子物理与原子核物理] TN249[理学—物理]