CN107621292A

CN107621292A - A kind of ultrasonic water meter mistake ripple compensation method of family

Info

Publication number: CN107621292A
Application number: CN201710609631.7A
Authority: CN
Inventors: 关铮; 黄晓明
Original assignee: Liaoning Hangyu Star Wulian Instrument Technology Co Ltd
Current assignee: Shuifa hangyuxing IOT Technology (Liaoning) Co.,Ltd.
Priority date: 2017-07-25
Filing date: 2017-07-25
Publication date: 2018-01-23
Anticipated expiration: 2037-07-25
Also published as: CN107621292B

Abstract

A kind of family ultrasonic water meter mistake ripple compensation method, upstream the time Tup and downstream time Tdn obtained with this measurement, calculates Δ T=Tdn Tup now, when | Δ T |>A ripple is compensated during 0.5 μ s, | Δ T |>During 1.5 μ s, two ripples are compensated, by that analogy.Δ T is that positive number compensates Tup, and Δ T is that negative compensates Tdn, and the wrong wave number amount compensation of upstream and downstream is arrived into identical value.Os=(Tdn+Tup) L*2/C, calculate the Os values of normal condition, preset MCU, because Os is not with flow velocity, temperature change, so as standard, the relatively every time Os in measurement, when differing by more than 0.9 μ s, the upstream and downstream time compensates 1 ripple simultaneously, when differing by more than 1.9 μ s, the upstream and downstream time compensates 2 ripples simultaneously, by that analogy.Ultrasonic amplitude caused by being effectively reduced the reasons such as impurity, dirt, bubble declines, so that the influence to metering precision such as wrong ripple.

Description

A kind of ultrasonic water meter mistake ripple compensation method of family

Technical field

The present invention relates to measuring instrument technical field, more particularly to a kind of compensation side of family after ultrasonic water meter mistake ripple Method.

Background technology

Ultrasonic transducer or ultrasonic reflections post submerged in water, scale formation easily is produced by water quality impact, it is such as clear Reason not in time, has a strong impact on that transducer receives amplitude, influences measurement accuracy.Simultaneously when being mixed into bubble in water quality, different medium Conduction gap to ultrasonic wave causes the change of transducer amplitude very big, has a strong impact on measurement accuracy.

When it is wrong ripple wrong measurement occur, universal more common method is to give up this measured value, continues to use previous Measured value.This may result in the generation of measurement error, influence the accuracy of measurement.To having bubble to full packages since blank pipe, If continuing to use previous measured value always during this, instrument will have very big delay, it is necessary to which the long period could return just Often measurement.

Wrong ripple phenomenon is very universal, selects a kind of suitable compensation method most important.

The content of the invention

It is an object of the invention to provide a kind of ultrasonic water meter mistake ripple compensation method of family, ultrasound can be more reasonably improved Metering sampling precision of the ripple in water.

The technical scheme of use is：

After completing a ultrasonic measurement, upstream the time Tup and downstream time Tdn of this measurement are obtained, calculates Δ T now =Tdn-Tup, Δ T value will not differ too big during wrong ripple, and in maximum stream flow maximum temperature, the maximum Δ T measured now is 0.4μs.Wrong ripple can be regarded as if when Δ T value is close to an even greater than measurement period, is set as 0.5 in the present system μs.When | Δ T |>A ripple is compensated during 0.5 μ s, | Δ T |>During 1.5 μ s, two ripples are compensated, by that analogy.If Δ T is positive number When compensate Tup, Δ T compensates Tdn when being negative.Identical value now is arrived into the wrong wave number amount compensation of upstream and downstream, for using public Formula：V_Line=C²* measurement result is not influenceed when Δ T/2L is calculated.It is of the invention further to calculate, Tdn, Tup are compensated Return actual value.According to formula Os=(Tdn+Tup)-L*2/C, Os values under normal circumstances are calculated, are preset in MCU, because Os Not with flow velocity, temperature change, thus as standard, the Os in relatively measuring every time, when differing by more than 0.9 μ s, upstream and downstream Time compensates 1 ripple simultaneously, and when differing by more than 1.9 μ s, the upstream and downstream time compensates 2 ripples simultaneously, by that analogy.Now will The upstream time, Tup and downstream time Tdn had been compensated for actual value.

It the advantage is that：

Ultrasonic amplitude caused by being effectively reduced the reasons such as impurity, dirt, bubble declines, so that wrong ripple etc. is accurate to measuring The influence of degree.

Brief description of the drawings

Fig. 1 is the theory diagram of the present invention.

Embodiment

Before this compensation method is put into practice, state when instrument does not occur wrong ripple is measured with oscillograph first, is recorded now Tdn, Tup, and Os corresponding to calculating, are set into MCU as standard value.

As shown in figure 1, this control method comprises the following steps that：

1st, after completing a ultrasonic measurement, upstream the time Tup and downstream time Tdn of this measurement are obtained.Jump to step 2。

2nd, Δ T=Tdn-Tup is calculated, is judged | Δ T | whether more than 0.5+nT（n=0,1,2...）Wherein T is transducer One clock cycle, if jumping to step 3, if not jumping to step 5.

3rd, judge whether Δ T is more than 0, if jumping to step 4, if not compensation downstream time：Tdn=Tdn+(n+1)T After jump to step 5.

4th, the upstream time is compensated：Tup=Tup+ (n+1) T, jumps to step 5.

5th, the sound path that Os1=(Tdn+Tup)-L*2/C, wherein L is two transducers is calculated, C is the velocity of sound.Jump to step 6.

6th, compare whether the Os1 differences in preset Os and this measurement, Os-Os1 in MCU are more than 0.9+nT（n=0,1, 2...）Wherein T is a clock cycle of transducer, if jumping to step 7, if not jumping to step 8.

7th, the upstream time is compensated：Tup=Tup+ (n+1) T, compensation downstream time Tdn=Tdn+ (n+1) T jump to step 8.

8th, this compensation terminates.

According to the above description, the present invention program can be realized with reference to art technology.

Claims

A kind of 1. family ultrasonic water meter mistake ripple compensation method, it is characterised in that the following steps, using this measurement upstream when Between Tup and downstream time Tdn, calculate Δ T=Tdn-Tup now, as | Δ T |>0.5+nT （ n=0,1...）When, then need to mend Repay（n+1）Individual ripple, if Δ T compensates Tup when being positive number, Δ T compensates Tdn when being negative；Then the Os1 and mark in measurement are compared Quasi- Os difference, works as Os-Os1>0.9+nT（n=0,1...）When, upstream and downstream time needs compensate simultaneously（n+1）The clock of individual ripple Cycle；Upstream time Tup and downstream time Tdn are now had been compensated for into actual value；Compensation terminates.