The relation between repose angle signals of solids in rotary kilns and state of the solids motion are analyzed .A fre-quency domain analysis method based on Fourier-transform is proposed to analyze the repose angle signals .Using image process-ing technique ,the repose angle of the material is measured on a laboratory kiln with similar drive chain of industrial kilns .By means of Fourier frequency spectrum analysis ,the measured repose angle signal is found to be contaminated by periodic noise due to the deviation of rotating axis .The high-pass spectral filter is applied to diminish the noise to obtain the real dynamic change of the repose angel .%通过实验方法研究了回转窑物料休止角信号与物料运动状态之间的关系，提出了运用傅里叶变换对休止角信号进行频域分析的方法。以一台与工业回转窑机械结构及传动方式一致的实验回转窑为平台，采用图像处理方法获取了物料休止角。通过傅里叶频谱分析方法发现休止角信号中存在较大干扰信号，对转筒圆心坐标信号的对照分析表明，该干扰信号主要由窑体转轴轴心位置偏移引起。采用高通频域滤波方法将干扰信号滤除，得到了休止角信号随时间的真实变化关系。
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