Influence of the colored noise on determining the period of a torsion pendulum
Luo Jie1, Zhan Wen-Ze1, Wu Wei-Huang1, Shao Cheng-Gang2, †, , Wang Dian-Hong1
       

Spectrum of the experimental signal shown in Fig. 2, displaying that higher harmonics are the primary noise, but the correlation method is insensitive to these harmonics. Note that there is a peak at frequency f = 2.55×10−3 Hz, which is the frequency of the pendulum.