Analysis of a dual beam laser velocimeter applied to microcirculation studies
作者:
Phung Le‐Cong,
Ralph H. Lovberg,
期刊:
Review of Scientific Instruments
(AIP Available online 1980)
卷期:
Volume 51,
issue 5
页码: 565-574
ISSN:0034-6748
年代: 1980
DOI:10.1063/1.1136255
出版商: AIP
数据来源: AIP
摘要:
A laser crossed‐beam anemometer has been applied to the study of capillary blood flow. Analysis of the various contributions to theS/Nratio of this system is presented, in which the effect of finite detector area is taken into account. Experimental data, takeninvivofrom a rabbit omentum, using a coherent frequency tracker, are included. The frequency tracker also serves as a particularly effective phase‐lock detection system, based upon the rotation of the relative polarization of the two incident beams. The data processing circuits are gated synchronously with the cardiac pulse, thus allowing measurement of flow velocity as a function of phase in the cardiac cycle. In spite of the considerable optical phase distortion incurred upon passage of the laser beams through the tissue covering the blood vessels, the autocorrelation of the fringe field (’’fringe visibility’’) remained high enough to permit useful velocity measurements. Rotation of the fringe direction allows measurement, with a one‐dimensional velocimeter, of randomly oriented flows.
点击下载:
PDF
(526KB)
返 回