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arXiv 0905.3165gr-qc
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ADC任务热诊断中的非线性误差修正

ADC non-linear errors correction in thermal diagnostics for the LISA mission

J. Sanjuan, A. Lobo, J. Ramos-Castro

摘要:

在LISA和LISA PathTM(LPF)中需要在毫赫兹范围内的频率下进行低噪声温度测量。LISA所需的温度稳定性在低至0.1 mHz的频率下约为10 uK/sqrt(Hz)。在本文中,我们专注于识别和减少测量时变温度信号时检测到的过量噪声源。这被证明是由于ADC传递曲线中的非理想性,并且当测量温度呈现uK/s的漂移时,测量带宽中的测量降低约一个数量级。在适合于LISA任务的测量系统中,需要降低这种噪声。已经实现了基于相同技术的两种不同方法,这两种方法都包括在带外添加抖动信号以减轻ADC非理想误差。当测量温度上升到10 uK/s时,通过使用这些方法,这种性质的过量噪声已被令人满意地降低。

英文摘要:

Low-noise temperature measurements at frequencies in the milli-Hertz range are needed in the LISA and LISA PathFinder (LPF). The required temperature stability for LISA is around 10 uK/sqrt(Hz) at frequencies down to 0.1 mHz. In this paper we focus on the identification and reduction of a source of excess noise detected when measuring time-varying temperature signals. This is shown to be due to non-idealities in the ADC transfer curve, and degrades the measurement by about one order of magnitude in the measurement bandwidth when the measured temperature exhibits drifts of uK/s. In a suitable measuring system for the LISA mission, this noise needs to be reduced. Two different methods based on the same technique have been implemented, both consisting in the addition of dither signals out of band to mitigate the ADC non-ideality errors. Excess noise of this nature has been satisfactorily reduced by using these methods when measuring temperature ramps up to 10 uK/s .

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