arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1202.2733gr-qc
收藏

LISA Pathfinder机载试验质量的飞行中磁特性

Inflight magnetic characterization of the test masses onboard LISA Pathfinder

Marc Diaz-Aguiló, Enrique García-Berro, Alberto Lobo

摘要:

LISA探路者是欧洲航天局在其LISA任务框架内的一个科学和技术演示器,后者的目标是成为第一个星载引力波观测站。LISA Pathfinder的有效载荷是所谓的LISA技术包,旨在测量标称自由降落中两个测试质量之间的相对加速度。诊断子系统由几个模块组成,其中之一是磁诊断单元。其主要功能是评估由于磁效应引起的试验质量之间的差分加速度噪声。该子系统由两个机载线圈组成,用于在试验质量位置产生受控磁场。这些磁场与磁阻磁矩和磁化率耦合,并在测试质量上产生力和扭矩。这些又产生由机载干涉仪感测的测试质量的运动偏移。我们证明,充分处理这些偏移,可以使用经典的多参数估计技术估计的测试群众的磁特性。此外,我们表明,需要特殊的处理程序,以尽量减少多通道串扰的影响。最后,我们证明了我们的估计的质量是频率依赖的。我们还建议,使用多频实验的整体估计,可以得到这样的方式,磁实验的结果更可靠。最后,利用我们的程序,我们计算的贡献的磁噪声的总检验质量加速度噪声。

英文摘要:

LISA Pathfinder is a science and technology demonstrator of the European Space Agency within the framework of its LISA mission, the latter aiming to be the first space-borne gravitational wave observatory. The payload of LISA Pathfinder is the so-called LISA Technology Package, which is designed to measure relative accelerations between two test masses in nominal free fall. The diagnostics subsystem consists of several modules, one of which is the magnetic diagnostics unit. Its main function is the assessment of the differential acceleration noise between the test masses due to magnetic effects. This subsystem is composed of two onboard coils intended to produce controlled magnetic fields at the location of the test masses. These magnetic fields couple with the remanent magnetic moment and susceptibility and produce forces and torques on the test masses. These, in turn, produce kinematic excursions of the test masses which are sensed by the onboard interferometer. We prove that adequately processing these excursions, the magnetic properties of the test masses can be estimated using classical multi-parameter estimation techniques. Moreover, we show that special processing procedures to minimize the effect of the multi channel cross-talks are needed. Finally, we demonstrate that the quality of our estimates is frequency dependent. We also suggest that using a multiple frequency experiment the global estimate can be obtained in such a way that the results of the magnetic experiment are more reliable. Finally, using our procedure we compute the the contribution of the magnetic noise to the total proof-mass acceleration noise.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑