Blood velocity measurements using a fiber-coupled self-mixing diode-laser Doppler velocimeter

1993 ◽  
Author(s):  
Frits F. M. de Mul ◽  
Marco H. Koelink ◽  
Ralph Berendsen ◽  
Jan Greve ◽  
Reindert Graaff ◽  
...  
Keyword(s):  
Diode Laser ◽  
Blood Velocity ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Velocity Measurements

Dual-fiber laser doppler velocimeter and its application to the measurements of coronary blood velocity

Biorheology ◽  
1988 ◽  
Vol 25 (1-2) ◽  
pp. 227-235 ◽  
Author(s):  
F. Kajiya ◽  
O. Hiramatsu ◽  
Y. Ogasawara ◽  
K. Mito ◽  
K. Tsujioka
Keyword(s):  
Fiber Laser ◽  
Blood Velocity ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter

Fiber-coupled self-mixing diode-laser Doppler velocimeter: technical aspects and flow velocity profile disturbances in water and blood flows

1994 ◽  
Vol 33 (24) ◽  
pp. 5628 ◽  
Author(s):  
M. H. Koelink ◽  
F. F. M. de Mul ◽  
A. L. Weijers ◽  
J. Greve ◽  
R. Graaff ◽  
...  
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Diode Laser ◽  
Laser Doppler ◽  
Laser Doppler Velocimeter ◽  
Technical Aspects ◽  
Blood Flows ◽  
Flow Velocity Profile

scholarly journals Laser-Doppler measurements on a round turbulent jet in dilute polymer solutions

1973 ◽  
Vol 60 (4) ◽  
pp. 721-731 ◽  
Author(s):  
Steven J. Barker
Keyword(s):  
Polymer Solutions ◽  
Initial Conditions ◽  
Laser Doppler ◽  
Turbulent Jet ◽  
Laser Doppler Velocimeter ◽  
Doppler Velocity ◽  
Velocity Measurements ◽  
Convergent Nozzle ◽  
Round Jets ◽  
Dilute Polymer Solutions

A laser-Doppler velocimeter suitable for the measurement of mean and fluctuating flow velocities in water is described. Results of a study using this system in an axisymmetric turbulent jet of water and dilute polymer solutions are given. The laser-Doppler technique is better suited for such measurements than either Pitot tubes or heat-transfer gauges because the Doppler velocity measurements are independent of the physical properties of the fluid. Previous velocity measurements in polymer jets have suffered from the effects of the additives upon the sensors.Turbulent round jets with Reynolds numbers between 5000 and 50000 were studied. For a jet issuing from a convergent nozzle the additives were found to have no effect upon the mean axial velocity or turbulence intensity at any point in the jet. However, for a jet issuing from a long length of circular pipe, the additives reduced the centre-line velocity and increased the turbulence level in the early part of the jet. Thus the principal effect of a polymer additive upon the jet appears to result from its effect upon the initial conditions.

Autonomic nervous system regulation of epicardial coronary vein systolic and diastolic blood velocity as measured by a laser Doppler velocimeter

1986 ◽  
Vol 64 (12) ◽  
pp. 1463-1472 ◽  
Author(s):  
W. K. Hellenbrand ◽  
G. A. Klassen ◽  
J. A. Armour ◽  
O. Sezerman ◽  
B. Paton
Keyword(s):  
Nervous System ◽  
Autonomic Nervous System ◽  
Cardiac Cycle ◽  
Stellate Ganglion ◽  
Blood Velocity ◽  
Laser Doppler ◽  
Right Atrial ◽  
Laser Doppler Velocimeter ◽  
Coronary Vein ◽  
Autonomic Nervous

The velocity of blood in a major epicardial coronary vein accompanying the left anterior descending coronary artery of dogs was measured by means of a 140-μm fiber optic probe connected to a laser Doppler velocimeter. Right atrial pressure, left ventricular intramyocardial and cavity pressures, aortic pressure, as well as peripheral and central coronary venous pressures were compared with the velocity of blood measured in the epicardial coronary vein midway between the sites of the catheters measuring proximal and distal coronary vein pressures. During control conditions, coronary vein velocity was 14–18 cm/s during systole and 1.0–2.1 cm/s during diastole. Right stellate ganglion stimulation, norepinephrine or isoproterenol increased diastolic coronary vein velocity significantly, whereas left stellate ganglion stimulation did not. Average peak systolic velocity was not affected by these interventions. During these positive inotropic interventions, the peak coronary vein velocity usually occurred later in the cardiac cycle than during control conditions. Positive inotropic interventions appeared to decrease coronary vein velocity during systole and increase it during diastole. Left vagosympathetic trunk stimulation decreased diastolic but not systolic coronary vein velocity and usually caused peak coronary vein velocity to occur earlier in the cardiac cycle than during control states. Changes induced by vagosympathetic trunk stimulation usually occurred within one cardiac cycle. It is concluded that coronary vein blood velocity can be influenced by the autonomic nervous system.

Laser Doppler microscope for blood velocity measurements

Biorheology ◽  
1978 ◽  
Vol 15 (3-4) ◽  
pp. 163-172 ◽  
Author(s):  
G.V.R. Born ◽  
A. Melling ◽  
J.H. Whitelaw
Keyword(s):  
Blood Velocity ◽  
Laser Doppler ◽  
Velocity Measurements
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