医疗卫生装备2018，Vol.39Issue(3)：15-18,4.DOI:10.7687/j.issn1003-8868.2018.03.015
基于自相关方法的光声多普勒碳颗粒悬混液流速测量
Photoacoustic Doppler flowmetry of carbon particles flow using autocorrelation method
摘要
Abstract
Objective To measure the axial flowing velocity of a suspension carbon particles of tens of micrometer-scale with an autocorrelation method.Methods The photoacoustic Doppler frequency shift was calculated from a series of individual A scans using an autocorrelation method.A 532 nm pulsed laser with the repetition rate of 20 Hz was used as a pumping source to generate photoacoustic signals.The photoacoustic signals were detected using a focused PZT ultrasound transducer with central frequency of 5 MHz.The suspension of carbon particles was driven by a syringe pump.The complex photoacoustic signal was calculated by the Hilbert transformation from time-domain photoacoustic signal.The complex photoacoustic signal was then autocorrelated to calculate Doppler frequency shift. The photoacoustic Doppler frequency shift was calculated by averaging the autocorrelation results of individual A scans.Results The feasibility of the proposed autocorrelation method was preliminarily demonstrated by quantifying the motion of a carbon particles suspension flow from 5 to 60 mm/s. The experimental results showed that the autocorrelation result approximately agreed with the setting velocity linearly.Conclusion It's feasible to measure photoacoustic Doppler flowmetry of carbon particles,and an ultrasonic transducer with high central frequency may promote the linear correlation between the autocorrelation result and flow rate during frequency shift measure-ment.关键词
自相关/光声多普勒流速测量/脉冲激光/碳颗粒悬混液/生物光子学Key words
autocorrelation/photoacoustic Doppler flowmetry/pulsed laser/carbon particles suspension/biomedical photonics分类
医药卫生引用本文复制引用
卢涛,白薇薇..基于自相关方法的光声多普勒碳颗粒悬混液流速测量[J].医疗卫生装备,2018,39(3):15-18,4.基金项目
河南省自然科学基金(162300410054) （162300410054）
河南省省属高校基本科研业务费专项(2015RCJH13) （2015RCJH13）
