小波变换在铁矿热重矿物分析曲线处理的应用

小波变换是化学计量学中的一门新兴技术,目前在仪器分析的波谱解析中已有诸多应用。而热重分析是一种广泛应用于材料领域的分析方法,只要物质受热发生质量变化,都可采用热重分析。因此可应用于材料热稳定性、矿物分析等,但有时热重分析的曲线会因某种未知因素干扰而难以分辨。利用MATLAB的小波工具箱解析铁矿石热重曲线,采用Daubechies小波的5阶2层分解,对热重曲线进行噪声滤除,并采用小波导数变换分离重叠峰,最终达到提高热重分辨率的目的。

Application of wavelet transform in curve processing for thermo-gravimetric analysis of iron ore

The wavelet transform is an emerging technology in chemometrics, and it has been used in wave spectrum analysis of instrumental determination. The thermo-gravimetric analysis (TGA) is a kind of analysis method which is widely used in material fields. As long as there is mass change in heating of materials, TGA can be used. Therefore, TGA is always applied to the thermal stability and mineral analysis of materials. Sometimes, however, the TGA curve is hardly distinguished due to the interference of unknown factors.The wavelet tool box in MATLAB was used to analyze the TGA curve of iron ores. The noise was filtered and removed by 5-order 2-layer resolution of Daubechies wavelet. The overlapping peaks were separated by wavelet derivative transform. Finally, the resolution ratio of TGA curve could be improved.