摘要
消除地球化学数据的噪声是充分提取地球化学信息的关键。快速傅里叶变换常应用于信号处理等方面,在地球化学数据降噪中的应用还处于尝试阶段。对青海省大柴旦镇柴达木山南坡一带金矿的地球化学数据进行快速傅里叶变换,得到Au、Cu、Pb、Zn、As、Sb等六种元素的功率频谱图,进而确定地球化学区域背景和局域背景的滤波截止幅强度。使用幅强度对原始数据做滤波处理,采用低通滤波剔除数据中的噪声。对比降噪前后的元素波形图和元素异常分布图,降噪后的波形更平稳光滑,异常分布更集中,充分降低了噪声的干扰,证明快速傅里叶变换在地球化学数据降噪处理中有良好的应用前景。
The denoising for geochemical data is important to fully extract geochemical information. Fast Fourier Transform was commonly used in signal processing applications, and still in the experimental stage for geochemical data denoising. Fast Fourier Transform was applied to geochemical data of gold mine in the south slope of Chaidamu mountain in Dachaidan town, Qinghai province. The power spectrum chart for the original data of Au,Cu,Pb,Zn, As, Sb was plotted, the regional background and local background filter cutoff amplitude intensity were determined. Then the noise was removed with a low pass filter noise in the data by the amplitude intensity. Comparing the wave- form of all elements and the figure of element distribution before and after denoising, the waveform was more stable and smooth, and abnormal zones was more focused. Fast Fourier Transform was proved to have good prospects in the geochemical data denoising.
出处
《科学技术与工程》
北大核心
2015年第26期124-127,135,共5页
Science Technology and Engineering
基金
中国地质调查局地质调查工作项目(12120114051601)
四川省应用基础研究计划项目(2013JY0061)
成都理工大学中青年骨干教师培养计划资助
关键词
傅里叶变换
地球化学
频谱
滤波
Fourier transform geochemistry filtering frequency spectrum
