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High-precision four-track gas ultrasonic flow transmitter

A flow transmitter, ultrasonic technology, applied in the direction of liquid/fluid solid measurement, measurement flow/mass flow, instruments, etc., can solve the problem of long time-consuming digital signal processing, long time interval between excitation moments, deviation of gas flow line velocity, etc. problem, to achieve the effect of improving real-time performance and measurement accuracy, and shortening the excitation time

Active Publication Date: 2017-06-13
HEFEI UNIV OF TECH
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Problems solved by technology

In this way, the digital signal processing takes a long time during the whole measurement process, therefore, the time between the excitation moments of each channel is also long
When the fluid flow rate changes rapidly, there will be deviations in the linear velocity of the gas flow measured between different channels within a measurement period, resulting in errors when using linear velocity weighting to obtain the average surface velocity

Method used

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  • High-precision four-track gas ultrasonic flow transmitter
  • High-precision four-track gas ultrasonic flow transmitter
  • High-precision four-track gas ultrasonic flow transmitter

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Embodiment Construction

[0067] see figure 1 , The primary instrument of the present invention is composed of eight gas ultrasonic transducers, flow tubes and installation components. The eight gas ultrasonic transducers are respectively transducer A, transducer B, transducer C, transducer D, transducer E, transducer F, transducer G and transducer H , each transducer acts as both a transmitting transducer and a receiving transducer. The eight ultrasonic transducers form four sound channels, which are respectively transducer A and transducer E (marked as sound channel 1), transducer B and transducer F (marked as sound track 2), Transducer C and transducer G (recorded as channel 3), transducer D and transducer H (represented as channel 4), the channel lengths of said channel 1 and channel 4 are relatively short, The channel lengths of the channels 2 and 3 are relatively long.

[0068] see figure 2 , the secondary instrument hardware system of the present invention consists of a transmission / recepti...

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Abstract

Disclosed is a high-precision four-track gas ultrasonic flow transmitter which is composed of a transmitting / receiving signal channel switching circuit, two driving signal generation and amplification circuits, two echo signal conditioning and collecting circuits, an FPGA minimum system, a DSP minimum system, a man-machine interface, a serial port communication module, a power management module, FPGA software and DSP software. The dual-transmitting and dual-receiving mode of simulating exciting two energy converters and simulating receiving two echo signals is adopted, and the mode of separating eight-way energy converter excitation from eight-way echo signal digital signal processing is adopted.

Description

technical field [0001] The invention relates to the field of flow measurement, and is a gas ultrasonic flow transmitter, especially a dual-transmission and double-receive mode that simultaneously excites two-way transducers and simultaneously receives two-way echo signals, and adopts eight-way transducer excitation. A four-channel gas ultrasonic flow transmitter in a separate mode from digital signal processing of eight-channel echo signals. Background technique [0002] Gas ultrasonic flowmeter (also known as gas ultrasonic flowmeter) is widely used in the field of natural gas flow measurement due to its advantages of high measurement accuracy, no pressure loss, large turndown ratio, and suitable for large diameters. The gas ultrasonic flowmeter is composed of a primary meter and a secondary meter. The primary meter includes a gas ultrasonic transducer, flow tube and installation parts. Secondary instrument (also known as transmitter) includes driving signal generation and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
CPCG01F1/662G01F1/667
Inventor 徐科军李剑波沈子文田雷穆立彬刘博
Owner HEFEI UNIV OF TECH
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