A Temperature Correction Method for Ultrasonic Water Meter without Temperature Sensor

Abstract

The invention discloses a temperature sensor-free ultrasonic water meter temperature correction method. The method comprises the following steps that ultrasonic wave flight times corresponding to multiple temperatures are measured; whether different flight times are within reasonable flight times or not is judged; a scatter diagram, segmentation correction curves and a curvilinear equation of flight time countdowns and sound velocities which correspond to all the temperatures are built according to sound velocities in water and flight times which correspond to the multiple different temperatures; average flight time is obtained through calculation; measuring sound velocities are obtained through calculation according to the curvilinear equation; a fitting curve of the sound velocities and the temperatures of the ultrasonic waves in the water is built; a corresponding fluid temperature is obtained. Accordingly, the accurate fluid temperature can be obtained without a temperature sensor; the accuracy of ultrasonic water meter temperature compensation is improved; the sound velocities corresponding to different temperatures in the water can be accurately obtained, and then the measurement precision of a time-difference method ultrasonic water meter is improved; meanwhile, use compatibility of the ultrasonic water meter to different ultrasonic flow sensors is expanded, and the hardware cost of the ultrasonic water meter is lowered.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic flow detection, in particular to an ultrasonic water meter temperature correction method without a temperature sensor. Background technique [0002] The ultrasonic water meter is an all-electronic instrument, which calculates the flow rate by detecting the time difference of the forward and reverse flight time of the ultrasonic beam in the water due to the time difference caused by the speed difference. Since the propagation speed of ultrasonic waves in water is greatly affected by temperature, and the flow state of fluid in pipelines is also affected by temperature, accurate measurement of fluid temperature in pipelines plays a vital role in the measurement of ultrasonic water meters. [0003] At present, most ultrasonic water meters use temperature sensors when measuring the temperature of fluids. The disadvantage of this method is that the accuracy and real-time performance of temperature se...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the above problems existing in the prior art, provide a temperature correction method for ultrasonic water meters without temperature sensors, and solve the problems of decreased measurement accuracy and low accuracy of temperature compensation for ultrasonic water meters without temperature sensors

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