Patent ID: 6089104
Filing Date: 2000-07-18
Classification: G01F,G01P

Abstract:
An ultrasonic flow meter for determining flow rates of a fluid medium flowing in a tube, said meter comprising:a short straight length of said tube defining a mid-point cross section along the length of said tube,an emitting transducer and a receiving transducer respectively mounted opposite to each other on a wall of said tube at said mid-point cross section, said emitting transducer emitting ultrasonic waves into said fluid medium, said receiving transducer for measuring a velocity of said emitted ultrasonic waves in said fluid medium,a plurality of receiving ultrasonic transducer pairs mounted on a circumference of the tube at said mid-point cross section along said length extending a distance (d) from left and right of the emitting transducer, said emitted ultrasonic waves being directed over a cross section of the tube into a plurality of chords of different distances between said plurality of receiving ultrasonic transducer pairs and the emitting transducer, andprocessing means (12) connected to said emitting transducer, said receiving transducer, and said plurality of receiving ultrasonic transducer pairs, said processing means (12) being responsive to a transit time of said ultrasonic waves emitted from the emitting transducer and received at said plurality of receiving ultrasonic transducer pairs for determining the flow rates of said fluid medium through said tube.