VERFAHREN UND VORRICHTUNG ZUM MESSEN VON STROEMUNGSBEWEGUNGEN IN EINEM FLUID

For determining flow motions in a fluid containing light scattering particles, in particular for determining the blood circulation in the superficial blood vessels in a tissue, a section of the fluid is illuminated with monochromatic light from a laser (1). Light scattered from particles in the flui...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	TORSTEN,. TENLAND,JAN, AAKE, OEBERG,PER, ERIK,DR.. NILSSON,GERT
Format:	Patent
Sprache:	ger
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES DIAGNOSIS HUMAN NECESSITIES HYGIENE IDENTIFICATION INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL MEDICAL OR VETERINARY SCIENCE METERING BY VOLUME PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION SURGERY TESTING
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	For determining flow motions in a fluid containing light scattering particles, in particular for determining the blood circulation in the superficial blood vessels in a tissue, a section of the fluid is illuminated with monochromatic light from a laser (1). Light scattered from particles in the fluid and from any surrounding stationary structures is gathered from two, at least partially separated but mutually adjacent regions of the illuminated section of the fluid and transmitted separately to two separate photodetectors (5, 5'). From the output signal of each photodetector a signal is derived, which contains the beat frequency components resulting from interference between light components received by the photodetector, which have different frequencies due to the Doppler frequency shift of the light scattered by moving particles. The two signals so derived from the output signals of the two photodetectors are subtracted from each other and the signal resulting from this subtraction is used as a measure of flow motions in the fluid.