CN103868555B - Difference detection method during a kind of circulation for ultrasonic flowmeter - Google Patents

Difference detection method during a kind of circulation for ultrasonic flowmeter Download PDF

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Publication number
CN103868555B
CN103868555B CN201210528773.8A CN201210528773A CN103868555B CN 103868555 B CN103868555 B CN 103868555B CN 201210528773 A CN201210528773 A CN 201210528773A CN 103868555 B CN103868555 B CN 103868555B
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China
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time
ultrasonic
transducer
signal
pipeline
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CN201210528773.8A
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Chinese (zh)
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CN103868555A (en
Inventor
李洪涛
朱晓华
顾陈
曾文浩
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南京理工大学
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Abstract

The invention discloses difference detection method during a kind of circulation for ultrasonic flowmeter.It is angled to be arranged in tested pipeline both sides using a pair of transducers as launching and receiving signal detection group.One detection cycle process is as follows:Control two transducers(A、B)Simultaneously as transmitting terminal, launch different frequency pulse signal;Two transducers of control are used as receiving terminal, record transducer A transmission signals reach transducer B time, transducer B transmission signals arrival transducer A time respectively, and the time difference is calculated, Continuous plus n times take calculate average time difference the kth time to+n time differences of kth(K=1 ..., N n), flow velocity and flow are calculated with reference to geological information.Compared with traditional time difference method, the detection method that the present invention is provided can meet demand of the transit time ultrasonic flow meters for high measurement accuracy on the basis of equipment amount is reduced.

Description

Difference detection method during a kind of circulation for ultrasonic flowmeter

Technical field

The present invention relates to ultrasonic flow meter technology, particularly a kind of circulation time difference detection side for ultrasonic flowmeter Method.

Background technology

Relative to mechanical flowmeter and electromagnetic type flow meter, ultrasonic flow is in respect of following plurality of advantages:Measuring accuracy It is height, the strong adaptability to caliber, non-contact measurement, easy to use and be easy to digital management etc..With piezoelectric ceramics skill The development of art, electronic technology and high-speed digital video camera technology, the performance of ultrasonic flowmeter has large increase, simultaneously Manufacturing cost also significantly declines, therefore ultrasonic flowmeter is widely applied in industrial circle and daily life.

Signal detection is carried out using time difference method mostly in the design of ultrasonic flowmeter at present, below to time difference method ultrasound The Cleaning Principle of low is simply introduced.As shown in Figure 1, it is to utilize to transit time ultrasonic flow meters operation principle A pair of ultrasonic transducers receive and dispatch ultrasonic waves, are measured by the propagation time difference for measuring ultrasonic wave following current and adverse current in a fluid The flow velocity of fluid, then calculate by flow velocity a kind of indirect measurement method of flow.

TransducerAnd transducer, two transducers be separately mounted to the both sides of fluid line and perpendicular to pipeline cut On the direction of face distance away, the interior diameter of pipeline is, the path length of ultrasonic propagation is, ultrasonic wave following current biography The time broadcast is, adverse current propagate time be, the direction of propagation of ultrasonic wave and the flow direction angle of fluid are.Due to The reason for flow of fluid, ultrasonic wave downstream propagationTime used in the distance of length is shorter than time used in adverse current, and flow velocity is surveyed Amount principle can be represented with following formula:

(1)

Wherein:It is spread speed of the ultrasonic wave in non-current medium,It is the flowing velocity of target fluid,With It is following current and adverse current propagation time.

Will(1)In two formulas subtract each other and can obtain:

(2)

It is indivisible that spread speed due to rate of flow of fluid with ultrasonic wave in media as well, which is compared, therefore above formula can simplify For:

(3)

So that the flow velocity for drawing fluid is:

(4)

Measure after flow velocity, can be by calculating the sectional area of pipeline, and then calculate outflow:

(5)

Wherein:For flow,For flow velocity,For the interior diameter of pipeline.

Existing transit time ultrasonic flow meters are when carrying out time difference detection, generally using following two methods:

Method one:Using a pair of ultrasonic transducers, detection process is as follows:

1)Ultrasonic transducerIt is used as transmitting terminal, transducerAs receiving terminal, transducer is controlledTransmission signal, so After detect transducerThe signal received, draws the time of ultrasonic wave downstream propagation in a fluid

2)Ultrasonic transducerIt is used as transmitting terminal, transducerAs receiving terminal, transducer is controlledTransmission signal, so After detect transducerThe signal received, draws the ultrasonic wave time that adverse current is propagated in a fluid

3)Calculate the propagation time difference of following current and adverse current

Method two:Using two pairs of ultrasonic transducers, detection process is as follows:

1)Ultrasonic transducerIt is used as transmitting terminal, transducerAs receiving terminal, transducer is controlledTransmission signal, so After detect transducerThe signal received, draws the time of ultrasonic wave downstream propagation in a fluid;While ultrasonic wave transducer DeviceIt is used as transmitting terminal, transducerAs receiving terminal, transducer is controlledTransmission signal, then detects transducerReceive The signal arrived, draws the ultrasonic wave time that adverse current is propagated in a fluid

2)Calculate the propagation time difference of following current and adverse current

It is existing from measurement accuracy, power consumption and manufacturing cost tripartite's surface analysis respectively in view of applicable cases in practice The deficiency that difference detection method is present at two kinds:

The measurement of method one draws the propagation that a time difference value needs ultrasonic wave once to be come and gone in target fluid, if The flow velocity of target fluid is uneven while change is more frequent, then method one measures obtained time difference value real-time will be by shadow Ring, the flow velocity thus calculated has certain error, finally calculates flow accuracy and be restricted.

Method two is measured using two pairs of ultrasonic transducers, although can so shorten measurement draws a time difference value Time, but be the increase in control and detection circuit complexity, while increasing the power consumption of whole flowmeter, in actual applications Power consumption is also the important indicator that must take into consideration in designing.

In actual applications, manufacturing cost is to weigh the major criterion of a design quality, and method two has used two exchanges Energy device, while control and detection circuit complexity are very high, while power consumption is increased, also increases manufacturing cost.

The content of the invention

It is an object of the invention to provide difference detection method during a kind of circulation for transit time ultrasonic flow meters, when making The problem of poor method ultrasonic flowmeter meets high, low in energy consumption measurement accuracy and low manufacturing cost simultaneously.

The technical solution for realizing the object of the invention is:One kind is used for difference detection method during ultrasonic flowmeter circulation, Poor using the ultrasonic propagation time between the ultrasonic transducer that pipeline both sides are arranged, its detecting step is as follows:

1)Using a pair of ultrasonic transducersAnd transducerIt is asymmetric respectively as launching and receiving signal probe group Ground is distributed in pipeline both sides and is separated by a certain distance;The company that transducer and signal generator are controlled is controlled by switch 1, switch 2 Logical, time-measurement device is connected with switch 1, switch 2, and computing circuit is connected with time-measurement device;

2)One measurement period includes two processes:

Process 1, control signal generator produces different frequency pulse respectively as transmission signal, while triggering ultrasonic waves Can deviceAnd transducerIt is used as transmitting terminal transmission signal;

Process 2, in the intermittent phase of pulse, control controlling switch 1 and switch 2 make ultrasonic transducerReceive ultrasonic waves Can deviceThe signal of transmitting, the time that ultrasonic wave arrives separately at receiving terminal is recorded with time-measurement device, make simultaneously Ultrasonic transducerReceive ultrasonic transducerThe signal of transmitting, is arrived separately at time-measurement device record ultrasonic wave and connect The time of receiving end;The time difference per group pulse signal is calculated with computing circuit

Process 3, in computing circuit, when circulation takes continuous n reception,, when taking kth time to kth+n times Between difference calculate average time difference

3)According to geometrical principle, the flow velocity of fluid is in pipeline:

,

WhereinFor the path length of ultrasonic propagation,For the light velocity;

Measure after flow velocity, by calculating the sectional area of pipeline, and then calculate the flow of fluid in pipeline:

,

Wherein,For the flow velocity of fluid in pipeline,For the interior diameter of pipeline.

The transmission signal that signal generator is produced is the different train of pulse of pulse frequency.

The present invention compared with prior art, its remarkable advantage:(1)The circulation time difference detection method that the present invention is provided is opened using double Pass, dual frequency technology, following current and adverse current echo can be received simultaneously, reduce manufacturing cost;(2)The present invention is asked using circulation timing The method of mean difference, improves measurement accuracy;The present invention provides a kind of more suitable for the design of transit time ultrasonic flow meters Detection method.

Brief description of the drawings

The ultrasonic flowmeter design frame chart of difference detection method when Fig. 1 is based on circulation.

Fig. 2 is transmission signal pattern.

Embodiment

Difference detection method during a kind of circulation for ultrasonic flowmeter of the invention, step is as follows:

1)Using a pair of ultrasonic transducersAnd transducerAs launching and receiving signal probe, pipe is separately mounted to The both sides of line;

2)Control signal generator produces transmission signal, and this transmission signal is the different train of pulse of pulse frequency, is touched simultaneously Send out ultrasonic transducerAnd transducerSignal transmitting is carried out as transmitting terminal;

3)In the intermittent phase of pulse, controlling switch 1 and switch 2 make ultrasonic transducerAnd transducerIt is used as reception End carries out signal reception simultaneously(Ultrasonic transducerReceive ultrasonic transducerThe signal of transmitting, ultrasonic transducer Receive ultrasonic transducerThe signal of transmitting);

4)Ultrasonic transducer is recorded with time-measurement deviceEach pulse signal of transmitting reaches ultrasonic transducerTime, i.e. ultrasonic wave downstream propagation time;Ultrasonic transducer is recorded simultaneouslyEach pulse of transmitting Signal reaches ultrasonic transducerTime, i.e., ultrasonic wave adverse current propagate time

5)In computing circuit, the time difference per group pulse signal is calculated

6)In computing circuit, take calculate average time difference the kth time to+n time differences of kth:

,

Flow velocity and flow are calculated then in conjunction with geological information.

The present invention is described in further detail below in conjunction with the accompanying drawings.

The present invention propose it is a kind of it is novel be used for transit time ultrasonic flow meters when difference detection method-circulation time difference Detection method, concrete principle is as follows:

As shown in Figure 1, using a pair of ultrasonic transducersWith, it is separately mounted to the both sides and apart of fluid line A certain distance, the interior diameter of pipeline is, the path length of ultrasonic propagation is, the direction of ultrasonic propagation and fluid Flow direction angle is, ultrasonic wave downstream propagation times are, the adverse current propagation time is

Its detecting step is as follows:

1)Using a pair of ultrasonic transducersAnd transducerAs launching and receiving signal probe, pipe is separately mounted to The both sides of line, such as Fig. 2;

2)Control signal generator produces transmission signal, and this transmission signal is the different train of pulse of pulse frequency, such as Fig. 2, Ultrasonic transducer is triggered simultaneouslyAnd transducerSignal transmitting is carried out as transmitting terminal;

3)In the intermittent phase of pulse, ultrasonic transducer is controlledAnd transducerSignal is carried out simultaneously as receiving terminal to connect Receive(Ultrasonic transducerReceive ultrasonic transducerThe signal of transmitting, ultrasonic transducerReceive ultrasonic transducerThe signal of transmitting);

4)Record ultrasonic transducerEach pulse signal of transmitting reaches ultrasonic transducerTime, i.e., it is ultrasonic The time of ripple downstream propagation;Ultrasonic transducer is recorded simultaneouslyEach pulse signal of transmitting reaches ultrasonic wave TransducerTime, i.e., ultrasonic wave adverse current propagate time

5)Calculate the time difference per group pulse signal

6)Take calculate average time difference the kth time to+n time differences of kth, wherein

,

The flow velocity of detected fluid can be drawn according to the operation principle of transit time ultrasonic flow meters:

(6)

Wherein:It can be obtained by calculating,It is spread speed of the ultrasonic wave in non-current medium,WithFor geometry Parameter, is fixed constant value.

Measure after flow velocity, can be by calculating the sectional area of pipeline, and then calculate outflow:

(7)

Wherein:For flow,For flow velocity,For the interior diameter of pipeline.

Claims (2)

1. difference detection method during a kind of circulation for ultrasonic flowmeter, it is characterised in that using what is arranged in pipeline both sides Ultrasonic propagation time between ultrasonic transducer is poor, and its detecting step is as follows:
1) it is asymmetrically distributed with respectively using a pair of ultrasonic transducer A and transducer B as launching and receiving signal probe group In pipeline both sides and it is separated by a certain distance;The connection that transducer and signal generator are controlled, time are controlled by switch 1, switch 2 Measuring apparatus is connected with switch 1, switch 2, and computing circuit is connected with time-measurement device;
2) measurement period includes two processes:
Process 1, control signal generator produces different frequency pulse respectively as transmission signal, while triggering ultrasonic transducer A and transducer B are used as transmitting terminal transmission signal;
Process 2, in the intermittent phase of pulse, controlling switch 1 and switch 2 make ultrasonic transducer A receive ultrasonic transducer B hairs The signal penetrated, the time t that ultrasonic wave arrives separately at receiving terminal is recorded with time-measurement devicel1,tl2,...,tlN, while making ultrasound Wave transducer B receives the signal of ultrasonic transducer A transmittings, and receiving terminal is arrived separately at time-measurement device record ultrasonic wave Time ts1,ts2,...,tsN;The time difference Δ t per group pulse signal is calculated with computing circuitx=tlx-tsx, (x=1,2 ..., N);
Process 3, in computing circuit, when circulation takes continuous n reception, (1≤n≤N) takes kth time to+n time differences meters of kth Calculation average time difference (k=1,2 ..., n-k):
3) according to geometrical principle, the flow velocity of fluid is in pipeline:
Wherein L is the path length of ultrasonic propagation, and c is the light velocity, and θ is that the direction of ultrasonic propagation and the flow direction of fluid are pressed from both sides Angle;
Measure after flow velocity, by calculating the sectional area of pipeline, and then calculate the flow of fluid in pipeline:
Wherein, V is the flow velocity of fluid in pipeline, and D is the interior diameter of pipeline.
2. difference detection method during circulation according to claim 1 for ultrasonic flowmeter, it is characterised in that:Signal is sent out The transmission signal that raw device is produced is the different train of pulse of pulse frequency.
CN201210528773.8A 2012-12-11 2012-12-11 Difference detection method during a kind of circulation for ultrasonic flowmeter CN103868555B (en)

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CN104502626A (en) * 2014-12-03 2015-04-08 国网河南省电力公司电力科学研究院 High-dynamic-response oil flow rate measuring device and measuring method
CN106643930B (en) * 2015-08-10 2019-03-19 杭州思筑智能设备有限公司 A kind of improved ultrasonic flowmeter
CN105091990B (en) * 2015-09-21 2018-07-31 南京南瑞集团公司 A kind of ultrasonic flowmeter water-free detection method
CN105698884B (en) * 2016-03-07 2019-07-09 上海电气自动化设计研究所有限公司 A kind of improved measurement method of transit-time ultrasonic flow meter

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