论文标题
Lisa中使用的空间惯性传感器的脉冲电荷对照的数值建模和实验证明
Numerical Modeling and Experimental Demonstration of Pulsed Charge Control for the Space Inertial Sensor used in LISA
论文作者
论文摘要
孤立自由活动测试质量的静电电荷控制是用于空间重力任务的关键促进技术。使用深紫外光在照明下从金属表面发出的光电发射可以实现无接触式静电电荷控制。无接触方法可以最大程度地减少可以扰动测量或中断科学操作的力扰动。在本文中，我们使用与激光干涉仪空间天线（LISA）引力天线相关的重力参考传感器几何形状提出了电荷控制实验。我们使用紫外线LED光源来控制测试质量电位，利用它们的高带宽将光输出置于用于测试质量的电容位置传感的100kHz电场。我们通过调整相对于电场的光相调节光率和测试质量电位控制。我们提出了一个简单的基于物理学的放电过程模型，该模型根据传感器中的紫外线分布，表面工作功能和量子收率来解释我们的实验结果。强大的拟合方法用于确定描述系统的模型的最佳拟合物理参数
Electrostatic charge control of isolated free-falling test masses is a key enabling technology for space-based gravitational missions. Contact-free electrostatic charge control can be achieved using photoelectron emission from metal surfaces under illumination with deep UV light. A contact-free method minimizes force disturbances that can perturb measurements or interrupt science operations. In this paper we present charge control experiments using a gravitational reference sensor geometry relevant to the Laser Interferometer Space Antenna (LISA) gravitational wave observatory in a torsion pendulum apparatus. We use a UV LED light source to control the test mass potential, taking advantage of their high bandwidth to phase-lock the light output to 100kHz electric fields used for capacitive position sensing of the test mass. We demonstrate charge-rate and test mass potential control by adjustment of the phase of the light with respect to the electric field. We present a simple physics-based model of the discharging process which explains our experimental results in terms of the UV light distribution in the sensor, surface work functions and quantum yields. A robust fitting method is used to determine the best-fit physical parameters of the model that describe the system
