摘要
数字相关是 PCS颗粒测量技术中的一个关键环节 ,自相关函数的估计质量直接影响颗粒测量的结果。自相关函数的估计可以通过硬件或软件方法得到。在软件数字相关方法中 ,利用相关计算时可以得到全部的采样数据这一与硬件相关所不同的特点 ,能去除采样数据中的均值 ,并在分析偏差的基础上 ,采用无偏估计 ,可有效地提高信噪比 。
Photon correlation spectroscopy (PCS) is an important technique in particle size analysis, in which autocorrelation function estimation plays a key role. Autocorrelation function can be estimated by two ways, hardware and softwere. The former need the correlator and can do real time processing. The latter, as an off line method, can be completed in program after sampling. Whether used by hardware or software, it is of importance to reduce bias effectively in particle sizing systerm. Based on the character of software correlation, two methords to improve the quality of softwere estimation were discussed:subtracted average from the signal, and adopted non bias estimation.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2003年第6期585-588,共4页
Chinese Journal of Scientific Instrument
基金
上海市科技发展基金资助项目
