Determination of the thermal noise limit in test of weak equivalence principle with a rotating torsion pendulum

Zhan Wen-Ze¹, Luo Jie^{1, †}, Shao Cheng-Gang^{2, ‡}, Zheng Di³, Yin Wei-Ming¹, Wang Dian-Hong¹

The spectrum of the amplitude of the signal shown in the top panel of Fig. 2, which is obtained by the conventional method of fast Fourier transform.