CN106441178A - Ultrasonic thickness measuring technology having self-correcting function - Google Patents
Ultrasonic thickness measuring technology having self-correcting function Download PDFInfo
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- CN106441178A CN106441178A CN201610974406.9A CN201610974406A CN106441178A CN 106441178 A CN106441178 A CN 106441178A CN 201610974406 A CN201610974406 A CN 201610974406A CN 106441178 A CN106441178 A CN 106441178A
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- ultrasonic
- thickness
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- measured piece
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
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- General Physics & Mathematics (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention relates to ultrasonic thickness measuring technology having a self-correcting function. Conventional ultrasonic thickness measuring technology includes: detecting time of flight T of ultrasonic waves in a measured member; utilizing sound velocity V of the ultrasonic waves, and acquiring thickness of the measured member according to a formula: D=VT/2. Due to different measured materials or temperature change of the measured member, transmission speed of the ultrasonic waves in the measured member changes, and great measuring errors may be caused if correction is not performed. The self-correcting ultrasonic thickness measuring technology includes that an ultrasonic probe (3) is arranged and serves as both an ultrasonic transmitting end and an ultrasonic receiving end, a correcting block (2) known in thickness is introduced between the ultrasonic probe (3) and the measured member (1), the correcting block (2) and the measured member (1) are made of a same material, and the thickness of the measured member can be measured by measuring leap time of the ultrasonic waves in the correcting block (2) and time of flight of the ultrasonic waves in the measured member (1), so that the self-correcting function is realized.
Description
Technical field
Present invention is mainly used for thickness measuring, can be used for pipeline, container wall thickness detects it can also be used to detect a flaw in metalwork inside etc..
Background technology
A lot of industries are required for carrying out thickness measure to workpiece, equipment etc. at present, or are detected a flaw etc. in inside.Ultrasonic
Ripple thickness measurement technology is a kind of conventional thickness measurement technology, and the principle of its technology is as follows：
1st, ultrasound probe is arranged on measured piece surface, inspires ultrasound wave using ultrasound probe, make ultrasound wave tested
Propagate in part, just have portion of ultrasonic sound wave when ultrasound wave runs into measured piece bottom surface and reflect and connect by ultrasound probe
Receive, measure the propagation time in measured piece for the ultrasound waveT, then utilize the velocity of sound of ultrasound waveV, you can calculate measured piece
Thickness, formula is as follows：
D=VT/2
D in formula represents the thickness of measured piece.
By this formula it is recognised that in order to accurately measure the thickness obtaining measured piece, needing accurately to know that ultrasound wave exists
Propagation time in measured pieceT, also must accurately know the velocity of sound of ultrasound wave simultaneouslyV.Current technology can be extremely accurate
Measure the propagation time of ultrasound wave, but spread speed in different materials for the ultrasound wave is different, and temperature
Change also can change the velocity of sound of ultrasound wave, sonigauge traditional at present all adopts a unified ultrasonic velocity
Calculate the thickness of measured piece it is impossible to correction changes, due to the velocity of sound, the measurement error causing.Obviously traditional ultrasonic thickness measurement technology
It is highly susceptible to disturb, precision is difficult to ensure that.
This patent is directed to a kind of ultrasonic thickness measurement technology with self-correcting function, can effectively eliminate sonic velocity change
The impact that measurement is caused.
Content of the invention
This patent is primarily directed to ultrasonic thickness measurement technology traditional at present to be needed for the velocity of sound of ultrasound wave to include wall thickness gauge
Calculate, testing result is easily affected this problem by extraneous factor it is proposed that a kind of ultrasonic thickness measurement with self-correcting function
Technology.
In order to eliminate the impact that sonic velocity change is brought to ultrasonic thickness measurement, in the present invention, innovatively introduce a correction
Block.The material of this correcting block is consistent with the material of measured piece, and the thickness of correcting block can be obtained with accurate measurement, is named asD 1 .School
The upper surface of positive block fixedly mounts a ultrasound probe, simultaneously as ultrasonic exciting end and ultrasound wave receiving terminal.To quilt
When survey part measures, the lower surface of correcting block is contacted with measured piece by couplant, so that ultrasound wave is more propagated
Enter measured piece.Ultrasound probe inspires ultrasound wave, and meanwhile system starts to calculate the propagation time of ultrasound wave.Excite
Ultrasound wave is propagated first in correcting block, and when ultrasound wave encounters the lower surface of correcting block, a part of ultrasound wave can reflect
Received by ultrasound probe, and record signal reception time, this time is named asT 1 ；A part of ultrasound wave can occur
Transmission, continues to propagate subsequently into measured piece, when this portion of ultrasonic sound wave encounters measured piece bottom, and some ultrasound wave is anti-
It is emitted back towards, and is finally received by ultrasound probe, equally record signal reception time, this time is named asT 2 .Now,
The thickness of measured piece can be obtained using equation below：
D
2
=D
1
（T
2
-T
1
）/T
1
In formula,T 1 Receive the time of correcting block echo for ultrasound probe；T 2 Receive measured piece for ultrasound probe anti-
The time of ejected wave；D 1 For the thickness of correcting block,D 2 Thickness for measured piece.
This formula only need to accurately measure the thickness of correcting block and ultrasound wave in correcting block and measured piece when walking
Between can obtain the thickness of measured piece, do not comprise the velocity of sound, that is to say that this method avoid ultrasonic velocity change causes to measurement
Impact, reached self-tuning purpose.
Beneficial effects of the present invention：During using ultrasonic technology thickness measuring, when ultrasonic velocity there occurs change, correcting block can
Effectively to eliminate the impact of sonic velocity change it is ensured that accuracy of detection.
Brief description
Fig. 1 self-correcting ultrasonic ripple thickness measurement technology principle
Fig. 2 self-correcting ultrasonic ripple thickness measurement technology receives the reflectance ultrasound ripple time
Crossing time in correcting block for Fig. 3 ultrasound wave
Crossing time in correcting block and measured piece for Fig. 4 ultrasound wave.
Specific embodiment
Details are as follows for one embodiment of the present of invention：
The present invention is a kind of ultrasonic thickness measurement technology with self-correcting function, and specific implementation step is as follows：
（1）Choose the metal plate that one piece of thickness is 10mm as measurand, the material of this metal plate is No. 20 carbon steels.Choosing
Machined a correcting block, cylindrically shaped, a diameter of 10mm of this correcting block with No. 20 carbon steels, thickness is 25mm.
（2）One ultrasound probe is symmetrically and fixedly mounted to the upper surface of correcting block.
（3）In the lower surface daubing coupling agent of correcting block, for measuring the thickness of metal plate.
（4）Heat tested metal plate using heater, for changing spread speed in metal plate for the ultrasound wave, with
When due to heat transfer effect, correcting block also simultaneously be heated, both temperature are consistent.
（5）Surveyed respectively using the self-correcting ultrasonic ripple thickness measuring system of design and common ultrasonic thickness measurement system in the present invention
Metal plate under amount different temperatures, measurement result is as follows：
Note：Wall thickness 1 is the testing result of self-correcting ultrasonic ripple thickness measuring system, and wall thickness 2 is the detection of conventional ultrasonic wave thickness measuring system
Result.It can be seen that, because temperature changes spread speed in measured piece for the ultrasound wave, the detection of traditional ultrasonic thickness measurement technology
Precision is very low, but self-correcting ultrasonic ripple thickness measuring system proposed by the present invention then effectively eliminates the shadow of ultrasonic velocity change
Ring, maintained very well accuracy of detection.
Claims (2)
1. a kind of ultrasonic thickness measurement technology with self-correcting function it is characterised in that：The work of current ultrasonic thickness measurement system
It is measurement flight time in measured piece for the ultrasound wave as principleT, recycle the velocity of sound of ultrasound waveVIt is calculated the thickness of measured piece
DegreeD, that is,D=V×T/2；But temperature change, material all can not cause the change of ultrasonic velocity on an equal basis, in turn result in measurement by mistake
Difference；The technical scheme that this patent proposes is that self-correcting is executed, and introduces a correcting block specifically in ultrasonic measurement loop, utilizes
This correcting block eliminates the impact that sonic velocity change causes to measurement automatically；Comprise the following steps that：
（1）Using a ultrasound probe, simultaneously as ultrasonic exciting probe and ultrasound wave receiving transducer；
（2）Introduce a correcting block between probe and measured piece, accurate measurement simultaneously records the thickness of this correcting block, is named asD 1 ,
The material of this calibration block is consistent with the material of measured piece；
（3）Measure and record ultrasound wave from start to be energized into from correcting block bottom reflection and by ultrasound probe received when
Between, it is named asT 1 ；
（4）Measure and record ultrasound wave from start to be energized into from measured piece bottom reflection and by ultrasound probe received when
Between, it is named asT 2 ；
（5）The thickness of measured piece can be calculated using equation belowD 2 ：
D 2 =D 1 ×（T 2 -T 1 ）/T 1
Step（5）Formula in do not comprise the velocity of soundV, therefore can effectively eliminate the velocity of sound and change the impact that measurement is caused.
2. according to right point 1, the thickness of correcting block is generally higher than 20mm, and its shape can be cylinder or cube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610974406.9A CN106441178A (en) | 2016-11-07 | 2016-11-07 | Ultrasonic thickness measuring technology having self-correcting function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610974406.9A CN106441178A (en) | 2016-11-07 | 2016-11-07 | Ultrasonic thickness measuring technology having self-correcting function |
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| CN201610974406.9A Pending CN106441178A (en) | 2016-11-07 | 2016-11-07 | Ultrasonic thickness measuring technology having self-correcting function |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702668A (en) * | 2017-11-16 | 2018-02-16 | 哈尔滨工程大学 | A kind of ultrasound thin oil film demarcation testboard |
| CN109282763A (en) * | 2018-10-12 | 2019-01-29 | 国营芜湖机械厂 | A kind of technique for aircraft composite enclosed construction repairing drilling localization method |
| CN111060043A (en) * | 2018-10-16 | 2020-04-24 | 中国石油化工股份有限公司 | Ultrasonic thickness measurement method based on temperature compensation |
| CN111561888A (en) * | 2020-05-22 | 2020-08-21 | 北京科海恒生科技有限公司 | Correction method for ultrasonic thickness measurement value |
| CN112729179A (en) * | 2020-12-24 | 2021-04-30 | 维沃移动通信有限公司 | Electronic device |
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| CN104380100A (en) * | 2012-06-19 | 2015-02-25 | 通用电气公司 | Method and system for correcting for temperature variations in ultrasonic testing systems |
| CN204730815U (en) * | 2015-07-13 | 2015-10-28 | 四川大学 | A kind of probe of the supersonic thickness meter with self-correcting function |
| CN205120064U (en) * | 2015-09-17 | 2016-03-30 | 广州市果欧电子科技有限公司 | Ultrasonic thickness meter |
| CN106441177A (en) * | 2016-11-03 | 2017-02-22 | 北京声华兴业科技有限公司 | A method and device for measuring the thickness of a workpiece in a manner of being capable of passing through coating |
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| CN2470786Y (en) * | 2001-03-21 | 2002-01-09 | 时代集团公司 | Supersonic thickness-measuring instrument |
| CN1928493A (en) * | 2006-07-14 | 2007-03-14 | 舟山市博远科技开发有限公司 | Device for measuring concrete member characters using acoustic wave and method for its use |
| CN102109333A (en) * | 2009-12-23 | 2011-06-29 | 中国科学院沈阳计算技术研究所有限公司 | Small-curvature radius complex curved surface intelligent ultrasonic thickness measurement system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107702668A (en) * | 2017-11-16 | 2018-02-16 | 哈尔滨工程大学 | A kind of ultrasound thin oil film demarcation testboard |
| CN109282763A (en) * | 2018-10-12 | 2019-01-29 | 国营芜湖机械厂 | A kind of technique for aircraft composite enclosed construction repairing drilling localization method |
| CN111060043A (en) * | 2018-10-16 | 2020-04-24 | 中国石油化工股份有限公司 | Ultrasonic thickness measurement method based on temperature compensation |
| CN111060043B (en) * | 2018-10-16 | 2021-10-22 | 中国石油化工股份有限公司 | Ultrasonic thickness measurement method based on temperature compensation |
| CN111561888A (en) * | 2020-05-22 | 2020-08-21 | 北京科海恒生科技有限公司 | Correction method for ultrasonic thickness measurement value |
| CN112729179A (en) * | 2020-12-24 | 2021-04-30 | 维沃移动通信有限公司 | Electronic device |
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Application publication date: 20170222 |