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A low-power gas ultrasonic flowmeter system based on stm32

An ultrasonic flowmeter, low power consumption technology, applied in the direction of liquid/fluid solid measurement, measurement flow/mass flow, measurement devices, etc., can solve the problems of poor echo signal quality and achieve the effect of reducing power consumption

Active Publication Date: 2021-11-26
HEFEI UNIV OF TECH
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  • Description
  • Claims
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Problems solved by technology

In addition, the present invention proposes a signal processing method of dynamic threshold and zero-crossing detection, which solves the problem of poor echo signal quality

Method used

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  • A low-power gas ultrasonic flowmeter system based on stm32
  • A low-power gas ultrasonic flowmeter system based on stm32
  • A low-power gas ultrasonic flowmeter system based on stm32

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Embodiment Construction

[0054] Below in conjunction with accompanying drawing, system of the present invention is described in further detail:

[0055] figure 1 It is a schematic diagram of the diameter reduction design of the flow tube of the system of the present invention. The flow tube of the primary instrument of the system of the present invention adopts a reduced-diameter design, the purpose of which is to reduce the length of the straight section of the flow tube and enhance the stability of the flow field. Under the same flow rate, the ratio of the flow velocity of the flow tube after the diameter reduction to that of the flow tube before the diameter reduction is calculated as follows:

[0056] Before diameter reduction, flow tube cross-sectional area S 1 for:

[0057]

[0058] After the diameter is reduced, the cross-sectional area of ​​the flow tube S 2 It consists of 4 parts, namely ① and ③ two sectors, ② and ④ two triangles. Since the two sectors are symmetrical to each other, t...

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Abstract

The invention discloses an STM32-based low-power gas ultrasonic flowmeter system, which includes a reduced-diameter flow tube, an ultrasonic transducer, a MOSFET drive circuit, a MOSFET boost circuit, an excitation gating circuit, and an echo gating circuit , a primary amplifier circuit, a band-pass filter circuit and a secondary amplifier circuit, a digital signal processing module circuit, a communication module circuit and a power supply module circuit. The system of the invention adopts the design of a high-pressure resistant transducer, and is suitable for pipelines of various pressures in custody transfer. Through monophonic transducer layout design, selection and use of STM32 chip low power consumption mode, peripheral circuit design and internal algorithm optimization, the power consumption of the whole system is fully reduced, so that the system of the present invention can be powered by batteries. In addition, a signal processing method combining dynamic threshold and zero-crossing detection is proposed to solve the problem of poor echo signal quality.

Description

technical field [0001] The invention relates to the field of flow measurement, and is a gas ultrasonic flow meter, especially a gas ultrasonic flow meter based on STM32 with low power consumption and monophonic design, aimed at the STM32L476 chip (hereinafter referred to as STM32 or STM32 The ultrasonic echo signal generated by the excitation output by the internal PWM module of the chip uses a dynamic threshold value and zero-crossing detection method to determine the gas ultrasonic flowmeter of the characteristic point of the echo signal. Background technique [0002] In some small-scale gas trade transfer measurement occasions, such as city gas, floor heating gas, small business gas, coal-to-gas conversion, etc., membrane gas meters are mostly used for transfer measurement in China. Although the membrane gas meter is relatively cheap, it can only achieve level 2 or level 3 measurement accuracy, and the measurement range is relatively narrow; at the same time, the measurem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/66
CPCG01F1/66G01F1/662
Inventor 徐科军马杰江圳徐浩然张伦
Owner HEFEI UNIV OF TECH
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