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Ultrasonic sending time correction method, system and flowmeter of ultrasonic flowmeter

A technology of sending time and correction method, which is applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, measuring device, etc., which can solve the problem of not being able to determine the first effective ultrasonic sending time and not being able to judge the number of the first ultrasonic wave Waves, small energy ultrasound can not be received and other issues

Active Publication Date: 2020-06-23
CHENGDU QIANJIA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the problem that in the existing ultrasonic flowmeter, the small-energy ultrasonic wave sent at the initial stage cannot be received when the ultrasonic transducer is started each time, and the system cannot judge that the first ultrasonic wave received is sent by the transducer. The number of waves, which leads to the problem of not being able to determine the sending time of the first effective ultrasonic wave, provides a way to determine which wave the first effective ultrasonic wave received is the first wave sent by the transducer, so as to determine the actual time of the effective ultrasonic wave The ultrasonic transmission start time correction method of the start time, in order to achieve the purpose of the above invention, the present invention provides the following technical solutions:

Method used

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  • Ultrasonic sending time correction method, system and flowmeter of ultrasonic flowmeter
  • Ultrasonic sending time correction method, system and flowmeter of ultrasonic flowmeter
  • Ultrasonic sending time correction method, system and flowmeter of ultrasonic flowmeter

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Embodiment 1

[0031] Embodiment 1: as figure 1 As shown, this embodiment provides a method for correcting the ultrasonic transmission time of an ultrasonic flowmeter, setting a number N of transmitted pulses, and the initial value of N is a natural number below 4. In this embodiment, the initial value of N is set is 1 (since the first pulse will never be received, the initial value can also be directly set to 2, 3, 4 or even 5 smaller natural numbers); calibration includes the following steps:

[0032] S101: The ultrasonic transducer sends an ultrasonic pulse; judge whether there is an ultrasonic wave received; if not received, go to step S102;

[0033] S102: Add one to the N value (ie N=N+1), send N ultrasonic pulses according to the corrected N value; judge whether there is an ultrasonic wave received, if not, repeat this step until an ultrasonic wave is received, then When the current value of N is the first ultrasonic pulse that can be received, that is, the Nth ultrasonic pulse is th...

Embodiment 2

[0037] Embodiment 2: as figure 2 As shown, this embodiment provides another method for correcting the ultrasonic transmission time of the ultrasonic flowmeter, setting a number of transmission pulses N, the initial value of N is a natural number above 6, such as this value can be set to 6, 9, 12 Even larger natural numbers such as 15; the correction includes the following steps:

[0038] S201: The ultrasonic transducer sends N ultrasonic pulses; judge whether there is an ultrasonic wave received; if the ultrasonic wave is received, enter step S202;

[0039] S202: Subtract one from the N value, and send N ultrasonic pulses according to the corrected N value; judge whether there is an ultrasonic wave received, and if so, repeat this step until no ultrasonic wave is received; then (the current value of N Add one) ultrasonic pulse as the first ultrasonic pulse that can be received.

[0040] Further, an ultrasonic wave amplitude threshold M is also set, and only when the amplitu...

Embodiment 3

[0041] Embodiment 3: as image 3 As shown, in this embodiment, we arbitrarily set a number N of sent pulses, and the correction includes the following steps:

[0042] S301: The ultrasonic transducer sends N ultrasonic pulses; judge whether there is an ultrasonic wave received; if no ultrasonic wave is received, enter step S302, and if received, enter step S303;

[0043] S302: Add one to the N value, send N ultrasonic pulses according to the corrected N value; judge whether there is an ultrasonic wave received, if not, repeat this step until an ultrasonic wave is received, then the Nth ultrasonic pulse is the first ultrasonic pulses that can be received;

[0044] S303: Subtract one from the N value, and send N ultrasonic pulses according to the corrected N value; judge whether there is an ultrasonic wave received, if so, repeat this step until no ultrasonic wave is received; then the N+1th ultrasonic wave Pulse is the first ultrasonic pulse that can be received.

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Abstract

The invention relates to the field of gas metering, in particular to an ultrasonic sending time correction method and system of an ultrasonic flowmeter and a flowmeter. The ultrasonic sending time correction method of the ultrasonic flowmeter provided by the present invention, by sequentially increasing or decreasing the number of ultrasonic pulses transmitted each time, it is determined that the first ultrasonic pulse that can be received in actual measurement is sent by the ultrasonic transducer The number of ultrasonic pulses, so as to determine the actual sending time of effective ultrasonic pulses, thus avoiding the measurement error caused by using the sending time of the first ultrasonic pulse sent by the ultrasonic transducer as the starting time of measurement in the prior art .

Description

technical field [0001] The invention relates to the field of gas metering, in particular to an ultrasonic sending time correction method and system of an ultrasonic flowmeter and a flowmeter. Background technique [0002] The basic working principle of the existing ultrasonic flowmeter is to set two ultrasonic transducers, judge the flow velocity of the gas by measuring the propagation time of the ultrasonic waves in the flowing gas, and then calculate the flow of the gas; but in practical applications, Such as Figure 5 As shown, the amplitude of the ultrasonic pulse emitted by the ultrasonic transducer in the initial stage after each start-up gradually changes from small to large until it is stable; while in the ultrasonic flowmeter, the ultrasonic wave with a small amplitude initially emitted is due to the small energy , it cannot be smoothly transmitted to another ultrasonic transducer, so it cannot be received and recorded, which leads to the fact that although the syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/66G01F25/00
CPCG01F1/66G01F25/15G01F25/00
Inventor 刘勋
Owner CHENGDU QIANJIA TECH CO LTD