Flowmetry (flow measurement)
ثبت نشده
چکیده
Flowmetry. Fluid-flow measurement and visualisation ................................................................................ 1 Measuring mass flow-rate ......................................................................................................................... 2 Accumulative weighting ....................................................................................................................... 3 Thermal mass flow-meter ..................................................................................................................... 3 Coriolis flowmeter ................................................................................................................................ 3 Choked flow .......................................................................................................................................... 4 Measuring volume flow-rate ..................................................................................................................... 4 Accumulative filling ............................................................................................................................. 4 Positive displacement meters ................................................................................................................ 4 Weirs ..................................................................................................................................................... 5 Measuring speed ....................................................................................................................................... 5 Tracer-particle tracking ......................................................................................................................... 5 Hot wires or hot plates .......................................................................................................................... 5 Laser doppler velocimetry .................................................................................................................... 6 Ultrasonic flowmeters ........................................................................................................................... 6 Vortex flowmeters................................................................................................................................. 7 Magnetic flowmeters............................................................................................................................. 7 Measuring drag effects .............................................................................................................................. 7 Turbine flow-meter ............................................................................................................................... 7 Rotameters ............................................................................................................................................ 8 Drag force meters .................................................................................................................................. 8 Measuring differential pressure ................................................................................................................ 8 Pitot ....................................................................................................................................................... 8 Venturi flowmeters ............................................................................................................................... 9 Flow obstruction meters ........................................................................................................................ 9 Flow visualization ..................................................................................................................................... 9 Interface optical diagnostics ................................................................................................................ 10 Refractometry...................................................................................................................................... 10
منابع مشابه
Evaluation of Carpal Tunnel Syndrome by Laser Doppler Flowmetry
Background:Autonomic disturbance can leads to blood flow changes that can be studied by various methods. Objective: To assess the blood flow changes in patients with severe carpal tunnel syndrome by laser Doppler flowmetry Methods:Ten patients with severe unilateral carpal tunnel syndrome confirmed by electrodiagnostic examination enrolled in this study. Patients comprised one man and nine wom...
متن کاملStructured-illumination photoacoustic Doppler flowmetry of axial flow in homogeneous scattering media.
We propose a method for photoacoustic flow measurement based on the Doppler effect from a flowing homogeneous medium. Excited by spatially modulated laser pulses, the flowing medium induces a Doppler frequency shift in the received photoacoustic signals. The frequency shift is proportional to the component of the flow speed projected onto the acoustic beam axis, and the sign of the shift reflec...
متن کاملMulti-channel deep tissue flowmetry based on temporal diffuse speckle contrast analysis.
Recently, diffuse speckle contrast analysis (DSCA) was introduced as a competent modality for deep tissue blood flow measurement, where the speckle contrast is calculated over spatial domain on the CCD image of diffuse reflectance. In this paper, we introduce time-domain DSCA where temporal statistics are used for speckle contrast calculation and results in the same deep tissue flow measurement...
متن کاملConfocal scanning laser Doppler flowmetry in the rat retina: origin of flow signals and dependence on scan depth.
OBJECTIVE To investigate the origin of signals from scanning laser Doppler flowmetry (SLDF) and the influence of axial scan depth on the measurement of blood flow in the rat retina. METHODS We performed SLDF in 5 adult Sprague-Dawley rats using a specially modified Heidelberg retina flowmeter. Axial scans were obtained from +2 diopters (D) to -3 D (in steps of 0.25 D) or from +1 D to -2 D (in...
متن کاملIntraoperative model to flowmetry measurement from coronary-coronary saphenous vein graft bypass
Methods We measured intraoperative grafts flowmetry in three patients with important retrograde flow from the coronary arteries throught saphenous vein grafts, verified after distal anastomosis. The surgeries were performed off pump. After the revascularization was completed, in the intraoperative model, we partially clamped the aorta, including both proximal veins anastomosis, and measured the...
متن کامل