Back to results
US 4,375,767 AGranted
Flow-through flow meter with ultrasound
AssigneeSiemens Aktiengesellschaft
InventorValentin Magori
Life of this patent
Estimating the term…
Abstract
A transducer is provided for a flow meter wherein the transducer has an interdigital structure of a polarization structure and/or of electrodes for the purpose of direct ultrasonic radiation at an angle .alpha., which is specifiable and electrically controllable, and wherein disturbances of a flow profile by the installed transducer are avoided.
Claims15
A flow-through flow meter adapted for use in a pipe line, comprising:
- two ultrasonic transducer means for respective transmission and for respective reception of ultrasonic radiation when installed in the pipe line, the radiation being directed relative to an axis of the pipe line obliquely at an angle .alpha. through a medium flowing in the pipe line between the transducer means so that a difference between the ultrasonic radiation received in the flow direction and ultrasonic radiation received counter to the flow direction may be utilized as a measure of the flow-through quantity and/or flow-through speed;
- each of said transducer means being designed so that when they are mounted in an interior wall of the pipe line they do not substantially disturb the medium flowing in the pipe line;
- each transducer means having associated therewith a material body and an interdigital structure;
- a thickness t of the transducer body being smaller than half a wavelength of the ultrasonic radiation in the material of the transducer body;
- a periodicity of the interdigital structure satisfying a condition
- d=.lambda./cos .alpha.
- where d is the periodicity of the interdigital structure, and .lambda. is a wavelength in the flowing medium in the pipe line;
- and connection means being provided coupled to AC voltage excitation means with a frequency f for radiation at an angle .alpha. at the given periodicity d.
5 more elements
A flow-through flow meter system, comprising:
- a pipe line;
- two ultrasonic transducer means for transmission and reception of ultrasonic radiation installed in the pipe line and wherein said ultrasonic radiation is directed relative to an axis of the pipe line at an angle .alpha. through a medium flowing between the transducer means in the pipe line;
- each of said transducer means being designed so that they conform to an interior wall of the pipe and do not substantially disturb the medium flowing in the pipe line;
- each transducer means having an interdigital structure associated with a piezo-electric body of the transducer, a thickness of the transducer body being smaller than half a wavelength of the ultrasonic radiation in a material of the transducer body;
- a periodicity of the interdigital structure satisfying a condition
- d=.lambda./cos .alpha.
- where d is the periodicity of the interdigital structure, and .lambda. is a wavelength in the flowing medium in the pipe line;
- and means for coupling an excitation voltage to the transducer means of frequency f which corresponds with ultrasonic radiation at an angle .alpha. given periodicity d.
5 more elements
Dependencies are inferred from the claim text.