Correlation method estimation of the modulation signal in the weak equivalence principle test

• 来源期刊: 中国物理B（英文版）
• 关键词: weak equivalence principle test correlation method amplitude estimation thermal noise limit
• 年，卷（期）: 2018,（8）
• 页码范围: 146-152
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/8/080402

摘要

In a test of the weak equivalence principle (WEP) with a rotating torsion pendulum, it is important to estimate the amplitude of the modulation signal with high precision. We use a torsional filter to remove the free oscillation signal and employ the correlation method to estimate the amplitude of the modulation signal. The data analysis of an experiment shows that the uncertainties of amplitude components of the modulation signal obtained by the correlation method are in agreement with those due to white noise. The power spectral density of the modulation signal obtained by the correlation method is about one order higher than the thermal noise limit. It indicates that the correlation method is an effective way to estimate the amplitude of the modulation signal and it is instructive to conduct a high-accuracy WEP test.