动态光谱提取方法的对比研究

Contrastive Study on Dynamic Spectrum Extraction Method

针对现有的频域法和单沿法这两种动态光谱提取方法进行了对比与研究。理论及实验结果表明,虽然两种方法提取动态光谱的角度不同,但其本质是相同的:源于动态光谱的基本原理、信号统计特性和平均作用的利用;对于周期、幅值较稳定的脉搏波,两种方法都能够提取高精度的动态光谱;相比较频域法,单沿法能够更好地抑制手指的抖动、光纤探头压力的改变等干扰,获取更高精度的动态光谱。

Dynamic spectrum method extracts the absorbance of the artery pulse blood with some wavelengths.The method can reduce some influence such as measurement condition,individual difference and spectrum overlap.It is a new way for noninvasive blood components detection.However,how to choose a dynamic spectrum extraction method is one of the key links for the weak ingredient spectrum signal.Now there are two methods to extract the dynamic spectral signal—frequency domain analysis and single-trial estimation in time domain.In the present research,comparison analysis and research on the two methods were carrued out completely.Theoretical analysis and experimental results show that the two methods extract the dynamic spectrum from different angles.But they are the same in essence—the basic principle of dynamic spectrum,the signal statistical and average properties.With the pulse wave of relative stable period and amplitude,high precision dynamic spectrum can be obtained by the two methods.With the unstable pulse wave due to the influence of finger shake and contact-pressure change,the dynamic spectrum extracted by single-trial estimation is more accurate than the one by frequecy domain analysis.