CN107202760A - A kind of method of laser excitation surface wave measurement sonic elastic modulus - Google Patents
A kind of method of laser excitation surface wave measurement sonic elastic modulus Download PDFInfo
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- CN107202760A CN107202760A CN201710342764.2A CN201710342764A CN107202760A CN 107202760 A CN107202760 A CN 107202760A CN 201710342764 A CN201710342764 A CN 201710342764A CN 107202760 A CN107202760 A CN 107202760A
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- laser
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- elastic modulus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1706—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1708—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids with piezotransducers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/061—Sources
- G01N2201/06113—Coherent sources; lasers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/10—Scanning
- G01N2201/106—Acousto-optical scan
Abstract
The present invention relates to a kind of method of laser excitation surface wave measurement sonic elastic modulus, this method comprises the following steps：1) by data wire each part of detection means is connected complete and be powered；2) sample to be checked is located at the focal length of vibration mirror scanning head, the effective coverage that vibration mirror scanning head is scanned is located at the center of sample to be checked, and make the laser scanning face of sample to be checked parallel to vibration mirror scanning head plane；3) the ultrasonic surface wave velocity of wave of the laser excitation under unstress state is obtained using piezoelectric transducer；4) treat and inspect sample progress multistage loadings, carry out data acquisition, and obtain the ultrasonic surface wave velocity of wave under different loads；5) the ultrasonic surface wave velocity of wave data under different loads are carried out with linear fit, fitting obtains the relative change of velocity of wave with the linear equation of stress variation.Compared with prior art, the present invention has the advantages that the reception of laser excitation piezoelectric sensing, high resolution, installation method be simple, measurement accuracy is high.
Description
Technical field
The present invention relates to acoustic elasticity fields of measurement, more particularly, to a kind of laser excitation surface wave measurement sonic elastic modulus
Method.
Background technology
The shearing wave of ultrasonic wave can produce birefringence when being propagated in object, and its velocity of wave can change with stress, this
Reflect that the method for interior of articles stress distribution is called Acoustic Elasticity using sonic velocity change is measured.For other of object propagation
Ripple, such as compressional wave, R wave, their velocity of wave is also with stress variation, and the method also with this measure of the change stress is called extensively
Adopted Acoustic Elasticity.It has been generally acknowledged that the relation between the velocity of sound and stress is linear, sonic elastic modulus is this linear for characterizing
The constant of relation.Sonic elastic modulus of the supercritical ultrasonics technology to measure material also has and sent out in recent years except traditional ultrasonic detecting technology
Electromagnetic acoustic and laser-ultrasound that exhibition is got up, current electromagnetic acoustic comparative maturity generally by SH ripples carry out residual stress
Detection, but it is only applicable to conductive or ferrimagnet.Laser-ultrasound have evolved into ultrasonics in recent years one is important
Branch, with noncontact, wide adaptation range, spatial resolution height, broadband, achievable quick comprehensive real-time online scanning etc.
Advantage, and this experiment laser-ultrasound used detector equipment is easy to carry, realizes measurement integration, is easy to commercial Application,
Compared with traditional ultrasonic non-destructive inspection techniques, overcome the time-consuming effort of traditional method for measuring stress, destruction, bulky etc. and lack
Point, thus the technology can be applied to workpiece quality detection in real time and monitoring, the Non-Destructive Testing of material and high temperature and high pressure environment
Lower measurement etc..Because acoustoelastic effect is a kind of weak effect, therefore sonic velocity change amount very little caused by stress, changes to velocity of wave
Accurate measurement be particularly important.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of laser excitation piezoelectricity
Sense reception, high resolution, the side for the laser excitation surface wave measurement sonic elastic modulus that installation method is simple, measurement accuracy is high
Method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of method of laser excitation surface wave measurement sonic elastic modulus, this method comprises the following steps：
1) by data wire each part of detection means is connected complete and be powered；
2) sample to be checked is placed in loads fixture, the vibration mirror scanning head of adjustment laser-ultrasound detector is inspected with waiting
The distance between sample, makes sample to be checked be located at the focal length of vibration mirror scanning head, starts laser-ultrasound detector, makes vibration mirror scanning
The effective coverage of head scanning is located at the center of sample to be checked, and makes the laser scanning face of sample to be checked parallel to vibration mirror scanning head
Plane；
3) the ultrasonic surface wave velocity of wave of the laser excitation under unstress state is obtained using piezoelectric transducer；
4) treat and inspect sample progress multistage loadings, every grade of loading is kept for certain time, after load is stable, carry out data and adopt
Collection, and obtain the ultrasonic surface wave velocity of wave under different loads；
5) the ultrasonic surface wave velocity of wave data under different loads are carried out with linear fit, fitting obtains the relative change of velocity of wave
B is with the linear equation of stress variation, and the slope of the linear equation is the sonic elastic modulus of sample to be checked.
Described detection means includes laser-ultrasound detector, support frame, computer, loads fixture, Material Testing Machine
And piezoelectric transducer, described laser-ultrasound detector is arranged on support frame, and described sample to be checked is fixed on loading clamp
Loaded in tool and by Material Testing Machine, described piezoelectric transducer is arranged on specimen surface to be checked, described computer point
It is not connected with Material Testing Machine, piezoelectric transducer and laser-ultrasound a detector.
Described support frame is adjustable height and the aluminium section bar support frame of position.
Described support frame lower end is provided with hoof pin, and described hoof pin includes hoof runners, Shockproof rubber pad and threaded rod.
Described step 2) in, the distance between the vibration mirror scanning head of laser-ultrasound detector and specimen surface to be checked are
350mm。
Described laser-ultrasound detector is LUFT-1300 laser-ultrasound detectors.
Described step 4) in, the loading retention time is 5-10min.
Described step 5) in, the expression formula of linear equation is：
B=K σ+b
Wherein, ViThe ultrasonic surface wave velocity of wave of laser excitation, V are loaded for ith0For laser excitation under unstress state
Ultrasonic surface wave velocity of wave, σ is stress, and K is sonic elastic modulus, and b is constant term, by material texture effect and unknown residual stress etc.
Factor causes..
Compared with prior art, the present invention has advantages below：
First, by the way of laser excitation, piezoelectric sensing are received, the high-resolution advantage of laser had both been remained, had been had concurrently again
System cost is low, it is easy to use the characteristics of, be suitable for industrial extensive utilization.
2nd, when distance change causes the ultrasonic wave to reach between traditional experiment measurement can be introduced due to being popped one's head in during test specimen tension and compression
Between change, that is, calculate the gained velocity of sound and produce change, and the velocity of sound is very small with stress variation, therefore this error can not be neglected
Depending on the ultrasonic propagation distance that LUFT-1300 laser-ultrasound detectors are excited gets distance dependent ready with laser setting, no
Influenceed by test specimen stretcher strain and probe positions, and resolution ratio is high, it is very sensitive for velocity of wave change caused by stress.
3rd, experimental method is simple, and experimental provision is built easily, and laser-ultrasound detector has realized integrated apparatus, real
Test step operation convenient, take less, and by the results show, the experiment has higher precision.
Brief description of the drawings
Fig. 1 is the structural representation of detecting system of the present invention.
Fig. 2 is detection means simplification figure.
Fig. 3 is by detecting variation relation figure of the cast iron materials R wave velocity of wave with loading stress.
Fig. 4 is the variation diagram by detecting the relative change of cast iron materials R wave velocity of wave with loading stress.
Description of symbols in figure：
1st, laser-ultrasound detector, 2, support frame, 3, hoof pin, 4, computer, 5, loads fixture, 6, Material Testing Machine,
7th, piezoelectric transducer.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present embodiment is a kind of measure based on Laser thermo-elastic generated surface acoustic waves method on cast iron brake disk sonic elastic modulus, specifically
Detection process is：
1) detection means is connected complete by data wire, be powered；
2) the cast rectangular body test block (31.8mm × 14.3mm × 80mm) processed is positioned over MTS647 hydraulic universals
In the fixture of Material Testing Machine, the distance between adjustment laser scanning head and sample make sample be located on its focal length, start and swash
The feux rouges scan command of light instrument, enables the effective coverage that vibration mirror scanning head is scanned to be located at object centers to be checked, and make to be checked
Object laser scanning face is parallel to vibrating lens head plane；
3) the accurate ultrasonic surface wave velocity of wave for determining laser excitation under unstress state, is measured using surface wave piezoelectric probe
The surface wave velocity of wave of cast iron；
4) treat and inspect sample progress multistage loadings, loading every time keeps 5-10min, after load is stable, progress data are adopted
Collection, different loads following table surface wave velocity is calculated based on MATLB software programmings；
5) in experimentation, note observing ultrasonic velocity and the relation of institute's loaded load under different loads, be carried in material
In the elastic range of material；
6) Vocal cord injection is based on, program calculation goes out the sonic elastic modulus of the cast iron brake disk material, further writes out it
Acoustic elasticity equation, by the wave speed measurement to the material brake disc other positions, substitutes into the acoustic elasticity equation obtained by experiment, you can
Carry out the demarcation of the brake disc surface residual stress.
As illustrated in fig. 1 and 2, detection means includes laser-ultrasound detector (LUFT) and for adjusting laser position
Aluminium section bar support frame, computer, universal testing machine, ultrasonic wave receiving transducer.Fig. 1 is based on laser-ultrasound method sound bullet to be a kind of
Property constant measurement system, include support frame 2, the computer of laser-ultrasound detector 1, adjustable height and position aluminium section bar
4th, the loads fixture 5 of laboratory sample, Material Testing Machine 6, piezoelectric transducer 7.Wherein LUFT1300 detection instrument systems are surpassed by laser
Sound field detector 1, support frame 2 and the part of computer 4 three composition.Hoof pin 3 is made up of hoof runners, Shockproof rubber pad and threaded rod,
With the effect such as support, shockproof, the adjustable height of screw rod.First adjustment lens plane is to tested sample distance before detecting first
350mm, then computer 4 send feux rouges scan command to laser-ultrasound detector 1, be scanned positioning, make detection sample
Select correct position to place piezoelectric transducer 7 positioned at the active position of scanning area, and on sample to be tested, adjust good position
Afterwards, computer 4 sends laser scanning order and gives laser-ultrasound detector 1, carries out detection zone laser dotting, laser is tested
Particles are set to excite sound wave according to dotted areas on sample, piezoelectric transducer 7 is fixed on reception signal at far field, finally led to
System software analysis gathered data is crossed, then computer 4 is inputted by USB interface, and is completed based on visual programming to whole detection
The control of system and processing to ultrasonic signal and result are shown.
As shown in figure 3, fitting gained linearly dependent coefficient be 0.9984, be highly correlated, the velocity of wave thus fitted with
Stress variation linear equation is：
V=7.666 × 10-2σ+2418.976
As shown in figure 4, fitting gained linearly dependent coefficient be 0.9984, be highly correlated, it follows that acoustic elasticity side
Cheng Wei
3.169×10-5/ MPa is the sonic elastic modulus of the cast iron brake disk, by material brake disc difference portion of the same race
The measurement of station ultrasonic wave velocity of wave, substitution can obtain corresponding stress value.
The present invention is made using the laser-ultrasound noncontact experimental provision of laboratory independent research from fiber pulse laser
For ultrasonic excitation light source, piezoelectric probe, which receives echo-signal, can directly calculate ultrasonic velocity, and for ultrasonic wave ripple
The minor variations measurement accuracy of speed is high.
Claims (8)
1. a kind of method of laser excitation surface wave measurement sonic elastic modulus, it is characterised in that this method comprises the following steps：
1) by data wire each part of detection means is connected complete and be powered；
2) sample to be checked is placed in loads fixture, the vibration mirror scanning head and sample to be checked of adjustment laser-ultrasound detector it
Between distance, sample to be checked is located at the focal length of vibration mirror scanning head, start laser-ultrasound detector, sweep vibration mirror scanning head
The effective coverage retouched is located at the center of sample to be checked, and makes the laser scanning face of sample to be checked flat parallel to vibration mirror scanning head
Face；
3) the ultrasonic surface wave velocity of wave of the laser excitation under unstress state is obtained using piezoelectric transducer；
4) treat and inspect sample progress multistage loadings, every grade of loading is kept for certain time, after load is stable, carries out data acquisition,
And obtain the ultrasonic surface wave velocity of wave under different loads；
5) the ultrasonic surface wave velocity of wave data under different loads are carried out with linear fit, fitting obtain the relative change B of velocity of wave with
The linear equation of stress variation, the slope of the linear equation is the sonic elastic modulus of sample to be checked.
2. a kind of method of laser excitation surface wave measurement sonic elastic modulus according to claim 1, it is characterised in that institute
The detection means stated includes laser-ultrasound detector (1), support frame (2), computer (4), loads fixture (5), the testing of materials
Machine (6) and piezoelectric transducer (7), described laser-ultrasound detector (1) are arranged on support frame (2), described to wait to inspect
Sample is fixed in loads fixture (5) and loaded by Material Testing Machine (6), and described piezoelectric transducer (7) is arranged on to be checked
Specimen surface, described computer (4) respectively with Material Testing Machine (6), piezoelectric transducer (7) and laser-ultrasound a detector
(1) connect.
3. a kind of method of laser excitation surface wave measurement sonic elastic modulus according to claim 2, it is characterised in that institute
The support frame (2) stated is adjustable height and the aluminium section bar support frame of position.
4. a kind of method of laser excitation surface wave measurement sonic elastic modulus according to claim 3, it is characterised in that institute
Support frame (2) lower end stated is provided with hoof pin (3), and described hoof pin (3) includes hoof runners, Shockproof rubber pad and threaded rod.
5. a kind of method of laser excitation surface wave measurement sonic elastic modulus according to claim 1, it is characterised in that institute
The step 2 stated) in, the distance between vibration mirror scanning head and specimen surface to be checked of laser-ultrasound detector are 350mm.
6. a kind of method of laser excitation surface wave measurement sonic elastic modulus according to claim 1, it is characterised in that institute
The laser-ultrasound detector stated is LUFT-1300 laser-ultrasound detectors.
7. a kind of method of laser excitation surface wave measurement sonic elastic modulus according to claim 1, it is characterised in that institute
The step 4 stated) in, the loading retention time is 5-10min.
8. a kind of method of laser excitation surface wave measurement sonic elastic modulus according to claim 1, it is characterised in that institute
The step 5 stated) in, the expression formula of linear equation is：
B=K σ+b
<mrow>
<mi>B</mi>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>V</mi>
<mi>i</mi>
</msub>
<mo>-</mo>
<msub>
<mi>V</mi>
<mn>0</mn>
</msub>
</mrow>
<msub>
<mi>V</mi>
<mn>0</mn>
</msub>
</mfrac>
</mrow>
Wherein, ViThe ultrasonic surface wave velocity of wave of laser excitation, V are loaded for ith0For the ultrasound of laser excitation under unstress state
Surface wave velocity of wave, σ is stress, and K is sonic elastic modulus, and b is constant term.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860716A (en) * | 2017-10-30 | 2018-03-30 | 东北大学 | A kind of lossless detection method and equipment of the elastic constant based on laser-ultrasound |
| CN110186849A (en) * | 2018-02-23 | 2019-08-30 | 波音公司 | For visualizing the laser-ultrasound scanning of damage or scrambling |
| CN110487908A (en) * | 2019-07-24 | 2019-11-22 | 大连理工大学 | A kind of elastic constant measurement method based on array magnet electromagnetic ultrasound |
| CN111257237A (en) * | 2020-02-10 | 2020-06-09 | 金陵科技学院 | High-rise building security system design method based on surface acoustic waves |
| CN113074849A (en) * | 2021-03-26 | 2021-07-06 | 重庆交通大学 | Concrete surface absolute stress measuring method based on laser ultrasonic technology |
| CN113720508A (en) * | 2021-08-12 | 2021-11-30 | 浙江省电力锅炉压力容器检验所有限公司 | Pillar porcelain insulator stress monitoring device and method based on double laser scanning |
| CN113884572A (en) * | 2021-08-18 | 2022-01-04 | 侬泰轲（昆山）检测科技有限公司 | Laser ultrasonic detection method |
| CN114137073A (en) * | 2021-11-22 | 2022-03-04 | 吉林大学 | Device and method for measuring excitation response of solid medium to ultrasonic frequency vibration |
| CN115684024A (en) * | 2022-10-25 | 2023-02-03 | 北京翔博科技股份有限公司 | Laser ultrasound-based residual stress distribution detection method and system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107860716A (en) * | 2017-10-30 | 2018-03-30 | 东北大学 | A kind of lossless detection method and equipment of the elastic constant based on laser-ultrasound |
| CN110186849B (en) * | 2018-02-23 | 2023-08-15 | 波音公司 | Method and system for testing test samples |
| CN110186849A (en) * | 2018-02-23 | 2019-08-30 | 波音公司 | For visualizing the laser-ultrasound scanning of damage or scrambling |
| CN110487908A (en) * | 2019-07-24 | 2019-11-22 | 大连理工大学 | A kind of elastic constant measurement method based on array magnet electromagnetic ultrasound |
| CN110487908B (en) * | 2019-07-24 | 2020-08-14 | 大连理工大学 | Elastic constant measuring method based on array magnet electromagnetic ultrasound |
| CN111257237A (en) * | 2020-02-10 | 2020-06-09 | 金陵科技学院 | High-rise building security system design method based on surface acoustic waves |
| CN113074849A (en) * | 2021-03-26 | 2021-07-06 | 重庆交通大学 | Concrete surface absolute stress measuring method based on laser ultrasonic technology |
| CN113720508A (en) * | 2021-08-12 | 2021-11-30 | 浙江省电力锅炉压力容器检验所有限公司 | Pillar porcelain insulator stress monitoring device and method based on double laser scanning |
| CN113720508B (en) * | 2021-08-12 | 2023-07-07 | 浙江省电力锅炉压力容器检验所有限公司 | Post porcelain insulator stress monitoring device and method based on double laser scanning |
| CN113884572A (en) * | 2021-08-18 | 2022-01-04 | 侬泰轲（昆山）检测科技有限公司 | Laser ultrasonic detection method |
| CN114137073A (en) * | 2021-11-22 | 2022-03-04 | 吉林大学 | Device and method for measuring excitation response of solid medium to ultrasonic frequency vibration |
| CN114137073B (en) * | 2021-11-22 | 2024-01-26 | 吉林大学 | Device and method for measuring response of solid medium to ultrasonic vibration excitation |
| CN115684024A (en) * | 2022-10-25 | 2023-02-03 | 北京翔博科技股份有限公司 | Laser ultrasound-based residual stress distribution detection method and system |
| CN115684024B (en) * | 2022-10-25 | 2023-08-08 | 北京翔博科技股份有限公司 | Residual stress distribution detection method and system based on laser ultrasound |
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