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arXiv 0709.0442gr-qc
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LISA Pathfinder上光学窗口的热诊断

Thermal diagnostic of the Optical Window on board LISA Pathfinder

M. Nofrarias, A. F. Garcia Marin, A. Lobo, G. Heinzel, J. Ramos-Castro, J. Sanjuan, K. Danzmann

摘要:

LTP重力参考传感器内部的真空条件必须符合相当苛刻的要求。光学窗口(OW)是一个密封真空外壳的接口,同时允许激光束通过,以便对测试质量进行干涉测量。OW是一个夹在钛法兰中的平面平行板,对热和应力波动相当敏感。它对于所需的精确测量至关重要,因此它的温度将在飞行中受到仔细监控。本文报道了一系列OW表征实验室运行的结果,旨在研究其对选定热信号的响应,以及它们与数值模型的拟合,以及后者的意义。我们发现,一个单极ARMA传递函数提供了一个一致的近似OW响应热激励,并推导出与物理过程发生在OW的关系。我们还展示了如何通过该传递函数来实现系统降噪。

英文摘要:

Vacuum conditions inside the LTP Gravitational Reference Sensor must comply with rather demanding requirements. The Optical Window (OW) is an interface which seals the vacuum enclosure and, at the same time, lets the laser beam go through for interferometric Metrology with the test masses. The OW is a plane-parallel plate clamped in a Titanium flange, and is considerably sensitive to thermal and stress fluctuations. It is critical for the required precision measurements, hence its temperature will be carefully monitored in flight. This paper reports on the results of a series of OW characterisation laboratory runs, intended to study its response to selected thermal signals, as well as their fit to numerical models, and the meaning of the latter. We find that a single pole ARMA transfer function provides a consistent approximation to the OW response to thermal excitations, and derive a relationship with the physical processes taking place in the OW. We also show how system noise reduction can be accomplished by means of that transfer function.

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。

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