CN104502463B - A kind of colloid couplant based on ultrasound detection - Google Patents
A kind of colloid couplant based on ultrasound detection Download PDFInfo
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- CN104502463B CN104502463B CN201410757558.4A CN201410757558A CN104502463B CN 104502463 B CN104502463 B CN 104502463B CN 201410757558 A CN201410757558 A CN 201410757558A CN 104502463 B CN104502463 B CN 104502463B
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- couplant
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Abstract
A kind of colloid couplant based on ultrasound detection, belongs to couplant and ultrasound detection field.The colloid couplant is using water to carry, konjaku flour and seawood meal form；Konjaku flour presses 9 with seawood meal：1 mass ratio mixes；1.3g mixed-powders match somebody with somebody 200ml water, and water is boiling water, while pouring into mixed-powder, stir boiling water, are uniformly mixed and treat that it is cooled down.Applied to ultrasound detection, within the long 10mm of colloid couplant thickness ratio probe radius.The present invention can carry out conventional directly reflection echo measurement, the measurement of the various velocities of wave in ultrasonic microscopic system to a variety of materials can also be realized, so as to calculate the Poisson's ratio of a variety of materials and elasticity modulus.Measurement result is consistent with theoretical value, and departing from the constraint of water, non-water-tight test specimen and inclined-plane can be measured, and has good prospect of the application.
Description
Technical field
This patent belongs to couplant, ultrasonic measurement field.
Background technology
In conventional ultrasound detection, since sound wave is decayed very greatly in air, so, in order to improve detection sensitivity,
Sound wave is enable to be effectively accomplished test specimen to realize the transmission of acoustic energy, couplant is must be filled between probe and workpiece.Coupling is situated between
Matter has on workpiece and probe contacts face excludes air, fills the function that sound wave is transferred in uneven gap.In general, in test section
Couplant is first applied on position or test specimen, waterproof test specimen can also be directly placed into water, air is excluded, then install probe and examined
It surveys.When being detected to rough surface, inclined-plane curved surface and vertical plane, general couplant due to being liquid,
It can cause to be lost in seriously, coupling loss is big, thereby reduces the transmitance of acoustic energy, final to influence detection.If use semiliquid class
Couplant, such as lubricant, honey, and can give to smear and recycle and bring unnecessary trouble.In view of conventional coupling is situated between
Geological Problems are more, so it is extremely urgent to study new couplant.
In order to solve the problems, such as these in ultrasound detection of conventional couplant, this patent carries out colloid couplant
Research.The colloid couplant is formulated with water as carrier.Its acoustic impedance and sound transparency is apparent compared with having for water
It improves, so as to improve the sensitivity of detection.Since the couplant is colloid, it is non-to solve test specimen to a certain extent
The problem of water logging.Moreover, the couplant is prepared simply, cost is relatively low, has good application prospect.
The content of the invention
Conventional high frequency ultrasound detection is required for water to do couplant, and the present invention develops a kind of glue based on ultrasound detection
Couplant is filled between the probe and test specimen of ultrasonic microscopic system by body couplant, passes through ultrasonic microscope system, energy
Preferably measure the elastic constant of material.And the constraint of the water departed from realizes the non-water logging measurement of test specimen.
To achieve these goals, this patent employs following scheme：
Measure colloid couplant density and acoustic impedance based on ultrasound detection.It can by repeatedly measuring density and acoustic impedance
To draw a conclusion, this colloid couplant can repeat to prepare.And acoustic impedance is high, can substitute water completely and do couplant.
A kind of colloid couplant based on ultrasound detection, it is characterised in that the colloid couplant is using water as load, evil spirit
Taro powder is formed with seawood meal；Konjaku flour presses 9 with seawood meal：1 mass ratio mixes；1.3g mixed-powders match somebody with somebody 200ml water, and water is boiling
Water while pouring into mixed-powder, stirs boiling water, is uniformly mixed and treats that it is cooled down.
Applied to ultrasound detection, within the long 5mm of colloid couplant thickness ratio probe radius.
Further：The hardware device of ultrasonic testing system includes embedded computer, motion drive, oscillograph, four axis
Motion, ultrasonic pulse excitation/receiving instrument, line focus PVDF ultrasonic probes are hereinafter referred to as popped one's head in, wherein embedding assembly
Machine is connected with oscillograph, and probe is connected with ultrasonic pulse excitation/receiving instrument, and during measurement, probe is fixed on four axes motion mechanism
Z axis on, colloid couplant is put on test specimen platform, above test specimen, probe is allowed to be coupled with colloid couplant；It is logical
Overregulate calibrating installation and pedestal, make probe vertical with surface of test piece, when echo-signal amplitude maximum, it is believed that at this time probe with
Surface is vertical, proceeds by and defocuses measurement.
Using focal position surface direct echo-signal of the colloid couplant based on ultrasound detection to aluminium block, surface wave
Velocity of wave, longitudinal wave velocity, Poisson's ratio, elastic constant measure：Including including ultrasonic microscope system, colloid couplant and examination
Part aluminium block.The ultrasonic microscope system of general measure is as shown in Figure 1.Include：PXI general control systems, TDS3K oscillographs, XYZ
Couplant, test specimen, calibration cartridge are made in axis mobile platform platform, 5900PR pulse excitations/receive instrument, line focus probe, sink, water
It puts.After the colloid couplant based on ultrasound detection, just sink and water are not being needed.Only need colloid couplant i.e.
It can.
The spread speed of ultrasonic wave in the material, elastic constant and density depending on material.If it is known that material
Longitudinal wave velocity can acquire Poisson's ratio with surface wave velocity of wave, if it is known that the density of material, can further calculate material
Elastic constant.Based on the ultrasonic system of acoustic microscope principle, popped one's head in using PVDF and defocus transmitting downwards from focal position and connect
The signal received can realize the longitudinal wave of test specimen and shear wave measurement.As shown in Figure 2.
The patent is realized under ultrasonic microscope system hardware platform, to surface wave velocity of wave, the longitudinal wave of aluminum material test specimen
The measurement of velocity of wave, Poisson's ratio, elasticity modulus, it is better than effect when couplant is made of water from the point of view of effect, and and aluminum material
The surface wave velocity of wave of test specimen, longitudinal wave velocity, Poisson's ratio, the theoretical value of elasticity modulus are consistent, make constraint of the experiment departing from water,
It can realize non-water logging or the detection on inclined-plane.
Description of the drawings
Fig. 1 ultrasonic microscope systems
Fig. 2 measuring principle figures
Fig. 3 colloid couplant powder
Fig. 4 colloids couplant makees the comparison of couplant with water
Fig. 5 colloids couplant is applied to ultrasonic microscope system
The surface wave velocity of wave for the aluminium that Fig. 6 application colloid couplants are measured
The surface wave velocity of wave for the aluminium that the colloid of Fig. 7 water and four kinds of different ratios measures when making couplant respectively
Specific embodiment
The hardware device of this ultrasonic testing system is integrated by embedded computer, motion drive, oscillograph, autonomous Design
Four axis precise motion mechanisms, ultrasonic pulse generation/receiving instrument, independent development line focus PVDF ultrasonic probes, composition, system connection
Line schematic diagram such as Fig. 5.Wherein embedded computer is connected with oscillograph with GPIB, and probe is used with ultrasonic pulse generation/receiving instrument
UHF adapters are connected, and during measurement, probe are fixed on Z axis, colloid couplant is put on test specimen platform, above test specimen, is allowed
Probe is coupled with them.By adjusting calibrating installation and pedestal, make probe vertical with surface of test piece, when echo-signal width
When value is maximum, it is believed that pop one's head at this time vertical with surface, can proceed by and defocus measurement.
The explanation of embodiment is done to this patent below：
1st, the colloid couplant based on ultrasound detection is made, selects electronic scale, weighs out the colloid that quality is 1.3g respectively
(konjaku flour presses 9 to couplant powder with seawood meal：1 ratio mixes, and the finished product mixed is as shown in Figure 3) gently pour into beaker
In, while pouring into, boiling water is stirred, it is come into full contact with and merges uniformly, treats that it is cooled down.
2nd, it is measured to the direct echo-signal in focal position surface of aluminium block and does couplant with water under same case
Signal compares, and the colloid couplant based on ultrasound detection is filled between test specimen and the probe of ultrasonic microscope system,
Adjust probe positions, result of the observation oscilloscope when popping one's head in focal position.Comparing result such as Fig. 4, it can be clearly seen that colloid
Couplant has stronger echo-signal, makees the better of couplant than water.Further, lower probe point surface is
Partial cylinder side, the inside are filled with colloid couplant, and shape is part cylindrical after the filling of colloid couplant, is flat
Row is in the shape that is cut into of center line of cylinder, but within colloid couplant thickness thickness is longer 2mm than probe radius.
3rd, using the colloid couplant based on ultrasound detection to surface wave velocity of wave, longitudinal wave velocity, Poisson's ratio, the bullet of aluminium block
Property constant measures.Colloid couplant is filled between the probe of ultrasonic microscope system and aluminium test specimen.Such as Fig. 5 institutes
Show.Measuring principle is as shown in Figure 2.Fig. 2 defocuses measuring principle figure for line focus probe.Wherein, F be sensor focal length, θRFor
Rayleigh angle, z are defocus distance.When sensor focuses on surface of test piece, be merely able to receive a direct surface echo D ripple and
Bottorm echo B ripples.When sensor defocuses movement downwards, two separated echoes can be generated, one is direct surface echo D
Ripple, another is the leaky surface wave R ripples propagated along surface of test piece.If ultrasonic wave in the height h of test specimen, water is known
Wave velocity CW, defocus distance z, direct reflection echo and Bottom echo time difference tB-tDAnd leaky surface wave the propagation time with
The slope m (defocus distance and leaky surface wave and the ratio of direct reflection echo signal time difference) of defocus distance plane upper curve,
Then longitudinal wave velocity and leaky surface wave velocity of wave can be calculated by following formula：
M=z/ Δs t (3)
If detected density of material ρ, longitudinal wave velocity CLAnd leaky surface wave wave velocity CRIt is known that it can obtain measured material
Poisson's ratio θ：
The elastic modulus E of material can be obtained by following formula：
From formula (4), formula (5), as long as material can be obtained by measuring the longitudinal wave velocity of material and leaky surface wave velocity of wave
Elastic constant.
The final surface wave velocity of wave that the colloid couplant based on ultrasound detection is used to measure aluminium is as shown in Figure 6.Measure it
Average value is 2945m/s, and the longitudinal wave velocity for the aluminium measured is 6314m/s, and the Poisson's ratio for calculating aluminium is 0.333, elasticity modulus
For 71.8495GPa.Each experimental result is consistent with theoretical value.Demonstrate the application prospect of this patent.
It is a series of by this experiment proves that the successful of the patent, realize the beam for departing from conventional ultrasound detection water
It ties up, has also reached the requirement of experiment.
Acoustic impedance：
The acoustic impedance of colloid couplant is measured.Couplant acoustic impedance is bigger, then with probe and test specimen sound
Impedance more matches.1#-4# represents the new colloidal couplant under different ratio.1# is that proportioning is (0.0065g/ml), and 2# is
It matches as (0.008g/ml), 3# is proportioning for (0.01g/ml), and 4# is proportioning for (0.012g/ml).The 1# from the point of view of measurement result
Best results.I.e. 1.3g powder is matched with 200ml water.
1 some couplants of table are compared with the density, the velocity of sound and acoustic impedance of the colloid couplant of making
Velocity of wave：
The surface wave velocity of wave of aluminium is measured with water using 1#-4#.Measurement result is as schemed.
Such as Fig. 7 it can be seen that measurement and result during 1# with water water are most identical, and the surface wave ripple of measurement result and aluminium
Fast theoretical value is consistent.So 1.3g is most matched with the more than acoustic impedance of 200ml water, it is also best in terms of measurement.
Because we will measure the surface wave velocity of wave of material, it is necessary to carry out defocusing test, i.e., probe moves downward, and adopts in real time
Collect waveform situation.So the colloid couplant being configured to is unsuitable blocked up, it is longer 5mm than probe radius.Since this coupling is situated between
Matter is without viscosity, so without worrying removing problem.
Claims (2)
1. a kind of application of the colloid couplant based on ultrasound detection, it is characterised in that the colloid couplant using water as
It carries, konjaku flour and seawood meal form；Konjaku flour presses 9 with seawood meal：1 mass ratio mixes；1.3g mixed-powders match somebody with somebody 200ml water, water
For boiling water, while pouring into mixed-powder, boiling water is stirred, is uniformly mixed and treats that it is cooled down；
Applied to ultrasound detection, within the long 5mm of colloid couplant thickness ratio probe radius.
2. according to the application described in claim 1, it is characterised in that：The hardware device of ultrasonic testing system includes embedded meter
Calculation machine, motion drive, oscillograph, four axes motion mechanism, ultrasonic pulse excitation/receiving instrument, line focus PVDF ultrasonic probes
It hereinafter referred to as pops one's head in, wherein embedded computer is connected with oscillograph, and probe is connected with ultrasonic pulse excitation/receiving instrument, ultrasound
Pulse excitation/receiving instrument connection oscillograph；During measurement, probe is fixed on the Z axis of four axes motion mechanism, on test specimen platform,
Colloid couplant is put above test specimen, probe is allowed to be coupled with colloid couplant；By adjusting calibrating installation and bottom
Seat, makes probe vertical with surface of test piece, when echo-signal amplitude maximum, it is believed that pops one's head in vertical with surface, proceeds by this time
Defocus measurement.
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| CN106950279A (en) * | 2017-04-05 | 2017-07-14 | 北京工业大学 | A kind of vortex scanning system of silicon solar cell defect |
| CN108562651B (en) * | 2018-04-12 | 2020-07-10 | 长春工程学院 | Pen type ultrasonic probe attitude closed-loop adjusting device and method |
| CN111650275B (en) * | 2020-04-01 | 2023-12-26 | 中车青岛四方机车车辆股份有限公司 | Defect detection device and detection method for large-thickness composite structural member |
| CN114605829A (en) * | 2022-02-14 | 2022-06-10 | 江苏大学 | Ultrasonic dry coupling material, preparation method thereof and performance parameter measuring method |
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| JPH0675062B2 (en) * | 1988-08-04 | 1994-09-21 | 三菱電機株式会社 | Ultrasonic probe device |
| CN1679968A (en) * | 2005-01-26 | 2005-10-12 | 赵尔飏 | Medical supersonic conductive gel |
| CN2781367Y (en) * | 2005-03-07 | 2006-05-17 | 北京工业大学 | Line fecusing PVDF piezoelectric film altrusonic probe |
| CN202497168U (en) * | 2012-04-24 | 2012-10-24 | 周宇峰 | Ultrasonic coupling device |
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| Title |
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| ODS铁素体钢弹性性能的超声检测方法;何存富等;《仪器仪表学报》;20130930;第34卷(第9期);第1948-1950页 * |
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