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Ultrasonic flow measurer

A flow measurement and ultrasonic technology, applied in the field of ultrasonic flow measuring instrument, can solve the problems of high-end products relying on imports and low-grade products surplus

Inactive Publication Date: 2016-03-30
WUXI QINGYANG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research and production of ultrasonic flow measuring instruments in my country are still relatively backward. Although the products of major foreign ultrasonic flow measuring instrument production companies have entered the Chinese market in recent years, it has also driven the development of domestic ultrasonic flow measurement research, but overall As mentioned above, our existing technology still has a large gap with the international advanced level. In the domestic market, high-precision ultrasonic flow measuring instruments are still dominated by foreign brands, forming a situation where low-end products are surplus and high-end products rely on imports. Only with sufficient financial support and hard work can it be possible to reach the international advanced level

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] The ultrasonic flow measuring instrument includes the minimum system module of the microprocessor, a power supply module, a reset circuit, a clock circuit, a transmitting circuit, a receiving circuit, a switching circuit and a liquid crystal display module, etc.;

[0028] The microprocessor generates the transmitting pulse signal, which is amplified and buffered by the transmitting circuit to drive the ultrasonic transducer; after receiving the signal, the other transducer is amplified by the receiving circuit and sent to the microprocessor for data conversion;

[0029] The microprocessor starts the DMA, reads the conversion result, and triggers an interrupt when the DMA reads a frame of data;

[0030] In the interrupt, the two transducers are switched to transmit and receive through the switching circuit, and the data in the other direction is read and stored;

[0031] After the data in both directions are received and stored, signal processing operations are performed...

Embodiment 2

[0033] The microprocessor is a low-power, high-performance fixed-point DSP—VC5509A launched by Texas Instruments (TI). It works at 0.9V, its core power consumption is only 0.05mw / MIPS, and its maximum operating frequency is 200MHz, VC5509A generates a transmission pulse signal, which is amplified and buffered by the transmission circuit to drive the ultrasonic transducer.

[0034] The power module is TI's TPS76D3OI, which is a low-dropout linear regulator (LDO), with an output voltage of +3.3V and an adjustable voltage of 1.6V, which can meet the power supply voltage requirements of VC5509A (1.6V and 3.3V) and 3.3V power requirements required by memory modules, CPLD logic control modules, etc.

[0035] The reset circuit includes power-on reset and manual reset. When the reset condition is satisfied, it can ensure that the reset low level lasts for a long enough time (generally more than 20ms), and generates a high level signal BTNRST.

[0036] The clock circuit is an internal...

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Abstract

The invention discloses an ultrasonic flow measurer. A microprocessor is responsible for generating transducer driving signals and processing received signals, and also responsible for metering the forward-stroke and return-stroke propagation time of ultrasonic signals in a pipeline. The microprocessor starts a DMA for reading a conversion result, and after the DMA reads a frame of data, an interrupt is triggered; during the interrupt, receiving and transmitting of two transducers are switched through a switching circuit, and data in the other direction is read and stored; after data in two directions is received and stored, signal processing operation is carried out on the two groups of data, and a flow value is obtained and transmitted to a liquid crystal display module to be displayed, wherein signal processing operation includes generalized cross-correlation computation and peak detection. The designed ultrasonic flow measurer has the advantages of being high in measuring speed, good in accuracy, low in cost and power consumption and the like; the ultrasonic flow measurer can be used for measuring low-impurity-content uniform fluid with the impurity content lower than 5 g / L and the grain size smaller than 1 mm, and the precision of the ultrasonic flow measurer can reach + / -1%.

Description

technical field [0001] The invention relates to an ultrasonic flow measuring instrument. Background technique [0002] The ultrasonic flow measuring instrument is based on the fact that after the ultrasonic wave is incident on the fluid, it will carry the information of the fluid flow velocity when it propagates in the fluid, and the flow velocity and flow rate of the fluid can be obtained by using the received signal after passing through the fluid. After the ultrasonic transducer converts electrical energy into ultrasonic energy, it emits it into the measured fluid, and after being received by the receiving transducer, it is converted into an electrical signal that represents the flow rate and is easy to detect, so as to realize the detection and display of the flow rate. [0003] Ultrasonic technology has already appeared and been used by people, but the application of ultrasonic technology to industrial measurement began in the past ten or twenty years. With the develop...

Claims

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Application Information

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IPC IPC(8): G01F1/66
Inventor 唐靖岚
Owner WUXI QINGYANG MACHINERY MFG