中国物理B ›› 2018, Vol. 27 ›› Issue (8): 80402-080402.doi: 10.1088/1674-1056/27/8/080402
• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇 下一篇
Jie Luo(罗杰), Liang-Cheng Shen(沈良程), Cheng-Gang Shao(邵成刚), Qi Liu(刘祺), Hui-Jie Zhang(张惠捷)
Jie Luo(罗杰)1, Liang-Cheng Shen(沈良程)1, Cheng-Gang Shao(邵成刚)2, Qi Liu(刘祺)3, Hui-Jie Zhang(张惠捷)1
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.
中图分类号: (Experimental tests of gravitational theories)