摘要
基于小波变换的多尺度分析理论,将小波去噪技术应用于磁感应原理的涂层测厚信号的处理中,能够较好的滤除噪声;采用了数字正弦波发生技术和可选择的变频技术,获得传感器良好的分段非线性解析式和振荡频率及幅值的稳定性,增强仪器对基体的适应性;采用有ARM核的CPU,提高算法的实时性,减少外围扩展。基于上述技术样机的测试结果表明:系统具有高的稳定性和测量精度,同时提高系统的可靠性和降低功耗,适合于实际应用。
De-noising method based on multi-resolution theory of wavelet is applied to dispose the metrical data of magnetic coating pachometer. The effect is well. With producing digital sine wave and optional frequency conversion by software ,the favorable subsection non-linear analytic formula is acquired and the stability of oscillatory frequency and amplitude is satisfying,so the flexibility to substrates is improved. Using CPU with ARM kernel, the algorithm is real-time and the peripheral extending is reduced. The tests of prototype with these principles show that the stability,precision and reliability are all improved and the power consumption is low. It is fit for applying in practice.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2005年第9期881-885,894,共6页
Chinese Journal of Scientific Instrument
关键词
电磁感应
涂层
测厚
小波去噪
Electromagnetic induction Coatings Pachometer Wavelet de-noising