Ultrasonic gas metering device with self-learning template and metering method of device

Abstract

The invention discloses an ultrasonic gas metering device with a self-learning template and a metering method of the device. The ultrasonic gas metering device comprises a central core processing module, an analog signal timing module, a signal processing module, a digital sampling module, a metering algorithm processing module, a template waveform learning module and a display module, wherein the central core processing module is in signal connection with each of the analog signal timing module, the signal processing module and the metering algorithm processing module; the analog signal timing module is in signal connection with the signal processing module; the sampling signal input end of the digital sampling module is connected with the signal processing module; the digital sampling module is in signal connection with the metering algorithm processing module; the metering algorithm processing module is in signal connection with the template waveform learning module; the signal input end of the display module is connected with the central core processing module; the signal processing module is used for collecting signals of a transducer. Through self-adaptive learning of template waveforms, an appropriate waveform template can be efficiently selected without being influenced by individual difference of the transducer, and the template can be more stable and reliable.

Description

technical field [0001] The invention relates to the field of instruments and meters, in particular to an ultrasonic gas metering device and method with a self-learning template. Background technique [0002] The gas ultrasonic flowmeter designed by the principle of "time difference method", through various mathematical analysis of ultrasonic signal and flight time, the method of flow calculation depends on the accurate judgment of signal and the guarantee of time accuracy; the principle of "time difference method" is as follows: The signal transmitted by one probe passes through the pipe wall and the medium, and after reaching the other side of the pipe wall, it is received by the other probe to obtain the first time-of-flight t AB , similarly, the signal transmitted by the second probe is also received by the first probe, and the second flight time t is obtained BA . Due to the influence of the flow velocity of the fluid medium, there is a time difference Δt between the t...

AI Technical Summary

Problems solved by technology

Direct positioning calculation points are easy to shift by one or more cycles

For the time of flight with an accuracy of at least us level, a cycle of ultrasonic waves is several us, which will cause the measurement error of the flowmeter to far exceed the system calibration range

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