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Gas ultrasonic flowmeter intermittent excitation and signal processing method and system based on adjacent peak maximum difference value

An ultrasonic flowmeter, the maximum difference technology, applied in liquid/fluid solid measurement, measurement flow/mass flow, measurement devices, etc., can solve the problem that it is difficult to determine the arrival time of the echo signal

Active Publication Date: 2017-06-20
HEFEI UNIV OF TECH
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Problems solved by technology

[0029] Aiming at the problem that it is difficult to determine the arrival time from the echo signal of the gas ultrasonic flowmeter, and the instrument requires high real-time performance, the present invention proposes a signal processing method of the gas ultrasonic flowmeter based on the maximum difference of adjacent peak values

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  • Gas ultrasonic flowmeter intermittent excitation and signal processing method and system based on adjacent peak maximum difference value
  • Gas ultrasonic flowmeter intermittent excitation and signal processing method and system based on adjacent peak maximum difference value
  • Gas ultrasonic flowmeter intermittent excitation and signal processing method and system based on adjacent peak maximum difference value

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Embodiment Construction

[0043] see figure 1 , The hardware system of the present invention consists of a transducer unit, a transmission / reception signal channel switching circuit, an excitation signal generation and amplification circuit, an echo signal conditioning and sampling circuit, a minimum DSP system, a minimum FPGA system and a power management module.

[0044] The transducer unit is composed of four transducers, which are respectively fixedly installed on the pipeline for conveying gas flow; the four transducers are respectively transducer 1, transducer 2, transducer 3 and transducer 4. It is formed into a direct two-channel structure; each transducer is used as both a transmitting transducer and a receiving transducer.

[0045] The minimum DSP system is composed of a DSP chip, a clock module, an external watchdog module, a FRAM (ferroelectric memory) module, a serial communication module and a button / liquid crystal module, wherein the model of the DSP chip is TMS320F28335.

[0046] The F...

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Abstract

Disclosed is a gas ultrasonic flowmeter intermittent excitation and signal processing system based on an adjacent peak maximum difference value. An ultrasonic transmitting transducer is excited through intermittent excitation signals (continuous non-coding excitation signals are transmitted one time, and then transmitted again after a certain period of time), and an ultrasonic signals are generated; when a receiving transducer receives ultrasonic signals, the signals are converted into echo signals; then, zero phase filtering is performed on the received echo signals, a characteristic wave corresponding to the maximum difference value of adjacent peaks in the echo signals is found, a mean value of eight zero crossing points behind the characteristic waves is adopted as a characteristic point, ultrasonic signal down flow and reverse flow transmitting time is determined, and the gas flow is calculated.

Description

technical field [0001] The invention relates to the field of flow measurement, and relates to a gas ultrasonic flow transmitter, in particular to a gas ultrasonic flow meter intermittent excitation and signal processing method and system based on the maximum difference between adjacent peak values. The invention adopts an intermittent excitation method to generate ultrasonic signals, adopts a maximum difference method of adjacent peak values ​​combined with a zero-crossing detection method to process ultrasonic echo signals, and realizes the measurement of gas flow. Background technique [0002] Gas ultrasonic flowmeter (also known as gas ultrasonic flowmeter) has many advantages such as high precision, no pressure loss, and wide measurement range. It is widely used in gas flow measurement, especially in the natural gas flow measurement of large-diameter pipelines. obvious. The commonly used measurement methods (principles) of gas ultrasonic flowmeters include propagation v...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
CPCG01F1/662
Inventor 徐科军田雷穆立彬刘博沈子文李剑波
Owner HEFEI UNIV OF TECH
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