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Coupling characterization and noise studies of the optical metrology system onboard the LISA Pathfinder mission

机译：LISA Pathfinder任务中光学计量系统的耦合特性和噪声研究

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We describe the first investigations of the complete engineering model of the optical metrology system (OMS), a key subsystem of the LISA Pathfinder science mission to space. The latter itself is a technological precursor mission to LISA, a spaceborne gravitational wave detector. At its core, the OMS consists of four heterodyne Mach-Zehnder interferometers, a highly stable laser with an external modulator, and a phase meter. It is designed to monitor and track the longitudinal motion and attitude of two floating test masses in the optical reference frame with (relative) precision in the picometer and nanorad range, respectively. We analyze sensor signal correlations and determine a physical sensor noise limit. The coupling parameters between motional degrees of freedom and interferometer signals are analytically derived and compared to measurements. We also measure adverse cross-coupling effects originating from system imperfections and limitations and describe algorithmic mitigation techniques to overcome some of them. Their impact on system performance is analyzed within the context of the Pathfinder mission.
机译：我们描述了光学计量系统（OMS）的完整工程模型的首次调查，光学计量系统是LISA探路者科学航天的关键子系统。后者本身是星载重力波探测器LISA的技术先驱任务。 OMS的核心包括四个外差Mach-Zehnder干涉仪，一个带外部调制器的高度稳定的激光器和一个相位计。它旨在监视和跟踪光学参考系中两个浮动测试质量块的纵向运动和姿态，分别具有（相对）精度在皮克计和纳弧度范围内。我们分析传感器信号的相关性，并确定物理传感器的噪声极限。通过分析得出运动自由度与干涉仪信号之间的耦合参数，并将其与测量结果进行比较。我们还测量了源自系统缺陷和局限性的不利交叉耦合效应，并描述了克服某些缺陷的算法缓解技术。在探路者任务的背景下分析了它们对系统性能的影响。

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