CN104502463A - Colloid coupling medium based on ultrasonic detection - Google Patents

Colloid coupling medium based on ultrasonic detection Download PDF

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Publication number
CN104502463A
CN104502463A CN201410757558.4A CN201410757558A CN104502463A CN 104502463 A CN104502463 A CN 104502463A CN 201410757558 A CN201410757558 A CN 201410757558A CN 104502463 A CN104502463 A CN 104502463A
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colloid
couplant
probe
ultrasonic
water
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CN201410757558.4A
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CN104502463B (en
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宋国荣
徐煜阳
吕炎
洪广富
秦登千
吴斌
何存富
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Beijing University of Technology
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Beijing University of Technology
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Abstract

The invention discloses a colloid coupling medium based on ultrasonic detection, and belongs to the fields of coupling mediums and ultrasonic detection. The colloid coupling medium consists of water which serves as a carrier, konjac flour and seaweed powder, and is prepared by the following steps: mixing the konjac flour and the seaweed powder at the mass ratio of 9 to 1, adding 200ml of boiling water to 1.3g of mixed powder and stirring the boiling water simultaneously, and uniformly mixing until a mixture is cooled. The colloid coupling medium is applicable to ultrasonic detection, and the thickness of the colloid coupling medium is within 10mm longer than the radius of a probe. The colloid coupling medium disclosed by the invention is applicable to conventional direct reflection echo measurement, and can be used for measuring various wave velocities of different materials in an ultrasonic microscope system, so that the Poisson ratios and the elasticity moduli of the materials are calculated. A measurement result is consistent with a theoretical value; the colloid coupling medium is free of the bondage of water, can be used for measuring waterproof test pieces and inclined planes, and has good application prospects.

Description

A kind of colloid couplant based on Ultrasonic Detection
Technical field
This patent belongs to couplant, ultrasonic measurement field.
Background technology
In the Ultrasonic Detection of routine, because sound wave is decayed very large in atmosphere, so, in order to improve detection sensitivity, making sound wave effectively can reach test specimen to realize the transmission of acoustic energy, between probe and workpiece, must couplant be filled.Couplant has deaeration on workpiece and probe contacts face, fills the function that sound wave is transmitted in uneven gap.Usually, detection position or test specimen are first coated with couplant, and waterproof test specimen also directly can put into water, is got rid of by air, then installs probe and detect.When detecting rough surface, inclined-plane curved surface and vertical plane, general couplant is owing to being liquid, and can cause and run off seriously, coupling loss is large, and then reduces the transmitance of acoustic energy, finally affects detection.If use semiliquid class couplant, as lubricant, honey etc., unnecessary trouble can be brought to smearing and reclaiming again.In view of the couplant more problems of routine, so it is extremely urgent to study novel couplant.
In order to solve conventional couplant these problems in Ultrasonic Detection, this patent is studied colloid couplant.It is formulated that this colloid couplant makes carrier with water.Its acoustic impedance and entrant sound comparatively water are all significantly improved, thus improve the sensitivity of detection.Because this couplant is colloid, to some extent solve the problem of the non-water logging of test specimen.And the preparation of this couplant is simple, and cost is also lower, has good application prospect.
Summary of the invention
Conventional high frequency ultrasound detects all needs water to do couplant, this invention exploits a kind of colloid couplant based on Ultrasonic Detection, between the probe that couplant is filled into ultrasonic microscopic system and test specimen, by ultrasonic microscope system, the elastic constant of material can be recorded better.And the constraint of the water departed from, the non-water logging achieving test specimen is measured.
To achieve these goals, this patent have employed following scheme:
Measure the colloid couplant density based on Ultrasonic Detection and acoustic impedance.Can be reached a conclusion by repetitive measurement density and acoustic impedance, this colloid couplant can repeat preparation.And acoustic impedance is high, water can be substituted completely and do couplant.
Based on a colloid couplant for Ultrasonic Detection, it is characterized in that described colloid couplant with water for carrying, konjaku flour and seawood meal form; Konjaku flour mixes by 9:1 mass ratio with seawood meal; 1.3g mixed-powder joins 200ml water, and water is boiling water, while pouring mixed-powder into, stirs boiling water, mixes and treat that it cools.
Be applied to Ultrasonic Detection, within the long 5mm of colloid couplant Thickness Ratio probe radius.
Further: the hardware device of ultrasonic testing system comprises embedded computer, motion drive, oscillograph, four axes motion mechanism, ultrasonic pulse excitation/receiving instrument, line focus PVDF ultrasonic probe hereinafter referred to as probe, wherein embedded computer is connected with oscillograph, probe encourages with ultrasonic pulse/and receiving instrument is connected, during measurement, probe is fixed on the Z axis of four axes motion mechanism, on test specimen platform, put colloid couplant above test specimen, allow probe and colloid couplant be coupled; By regulating calibrating installation and base, making probe vertical with surface of test piece, when echoed signal amplitude maximum, thinking that now probe is vertical with surface, starts to carry out defocusing measurement.
The colloid couplant applied based on Ultrasonic Detection is measured the focal position of aluminium block surperficial directly echoed signal, surface wave velocity of wave, longitudinal wave velocity, Poisson ratio, elastic constant: comprise and comprise ultrasonic microscope system, colloid couplant and test specimen aluminium block.The ultrasonic microscope system of routine measurement as shown in Figure 1.Include: PXI general control system, TDS3K oscillograph, XYZ axle mobile platform platform, 5900PR pulse excitation/accept instrument, line focus probe, tank, water make couplant, test specimen, calibrating installation.Apply based on after the colloid couplant of Ultrasonic Detection, just not at needs tank and water.Only need colloid couplant.
Ultrasound wave velocity of propagation in the material, depends on elastic constant and the density of material.If the longitudinal wave velocity of known materials and surface wave velocity of wave can try to achieve Poisson ratio, if the density of known materials, the elastic constant of material can be calculated further.Based on the ultrasonic system of acoustic microscope principle, utilize PVDF to pop one's head in from focal position and defocus the signal launched and accept downwards, compressional wave and the shear wave that can realize test specimen are measured.As shown in Figure 2.
This patent achieves under ultrasonic microscope system hardware platform, to the measurement of the surface wave velocity of wave of aluminum test specimen, longitudinal wave velocity, Poisson ratio, elastic modulus, from effective than when making couplant of water of effect, and it is consistent with the theoretical value of the surface wave velocity of wave of aluminum test specimen, longitudinal wave velocity, Poisson ratio, elastic modulus, experiment the is departed from constraint of water, can realize the detection on non-water logging or inclined-plane.
Accompanying drawing explanation
Fig. 1 ultrasonic microscope system
Fig. 2 measuring principle figure
Fig. 3 colloid couplant powder
Fig. 4 colloid couplant and water do the contrast of couplant
Fig. 5 colloid couplant is applied to ultrasonic microscope system
The surface wave velocity of wave of the aluminium that Fig. 6 application colloid couplant is measured
The surface wave velocity of wave of the aluminium that the colloid of Fig. 7 water and four kinds of different ratio records when making couplant respectively
Embodiment
The hardware device of this ultrasonic testing system by embedded computer, motion drive, oscillograph, the integrated four axle precise motion mechanisms of autonomous Design, ultrasonic pulse generation/receiving instrument, independent development line focus PVDF ultrasonic probe, form, system on line schematic diagram is as Fig. 5.Wherein embedded computer is connected with oscillograph GPIB, pop one's head in produce with ultrasonic pulse/receiving instrument UHF adapter is connected, during measurement, probe is fixed on Z axis, on test specimen platform, above test specimen, put colloid couplant, allow probe be coupled with them.By regulating calibrating installation and base, making probe vertical with surface of test piece, when echoed signal amplitude maximum, can think that now probe is vertical with surface, can start to carry out defocusing measurement.
This patent is done to the explanation of embodiment below:
1, the colloid couplant based on Ultrasonic Detection is made, select electronic scales, scale mass is that (konjaku flour mixes in 9:1 ratio with seawood meal for the colloid couplant powder of 1.3g respectively, the finished product mixed is as shown in Figure 3) pour into gently in beaker, while pouring into, stir boiling water, make it fully contact and merge evenly, treating that it cools.
2, measure its focal position to aluminium block surface directly echoed signal and and the signal that under same case, water does couplant compare, colloid couplant based on Ultrasonic Detection is filled between the probe of test specimen and ultrasonic microscope system, adjustment probe positions, the result of observation oscilloscope when popping one's head in focal position.Comparing result is as Fig. 4, and obviously can find out that colloid couplant has stronger echoed signal, the effect making couplant than water is better.Further, lower probe divides surface to be partial cylinder side, and the inside is all filled with colloid couplant, and it is part cylindrical that colloid couplant fills rear shape, be the shape that the center line being parallel to cylinder cuts out, but colloid couplant thickness thickness is than within the long 2mm of probe radius.
3, the colloid couplant applied based on Ultrasonic Detection is measured the surface wave velocity of wave of aluminium block, longitudinal wave velocity, Poisson ratio, elastic constant.Colloid couplant is filled between the probe of ultrasonic microscope system and aluminium test specimen.As shown in Figure 5.Measuring principle as shown in Figure 2.Fig. 2 is that line focus probe defocuses measuring principle figure.Wherein, F is the focal length of sensor, θ rfor Rayleigh angle, z is 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 ripple.When sensor defocuses motion downwards, can produce two echoes be separated, one is direct surface echo D ripple, and another is the leaky surface wave R ripple propagated along surface of test piece.If known hyperacoustic wave velocity C in the height h of test specimen, water w, defocus distance z, directly reflection echo and Bottom echo mistiming t b-t d, and leaky surface wave is at the slope m (ratio of defocus distance and leaky surface wave and direct reflection echo signal mistiming) of travel-time and defocus distance plane upper curve, then longitudinal wave velocity and leaky surface wave velocity of wave can be calculated by following formula:
C L = 2 h t B - t D - - - ( 1 )
C R = C W [ 1 - ( 1 - C W 2 m ) 2 ] - 1 2 - - - ( 2 )
m=z/Δt (3)
If detected density of material ρ, longitudinal wave velocity C l, and leaky surface wave wave velocity C rknown, the Poisson ratio θ of measured material can be obtained:
( 2.5088 C L 2 - 2 C R 2 ) θ 2 + ( 2.6432 C L 2 - 2 C R 2 ) θ 2 - ( 0.4350 C L 2 - 2 C R 2 ) θ - ( 0.7569 C L 2 - 2 C R 2 ) - - - ( 4 )
The elastic modulus E of material can be obtained by following formula:
E = C L 2 ( 1 + θ ) ( 1 - 2 θ ) ρ ( 1 - θ ) - - - ( 5 )
From formula (4), formula (5), as long as record the elastic constant that the longitudinal wave velocity of material and leaky surface wave velocity of wave can obtain material.
Final utilization records the surface wave velocity of wave of aluminium as shown in Figure 6 based on the colloid couplant of Ultrasonic Detection.Recording its mean value is 2945m/s, and the longitudinal wave velocity of the aluminium measured is 6314m/s, and the Poisson ratio calculating aluminium is 0.333, and elastic modulus is 71.8495GPa.Each experimental result is consistent with theoretical value.Demonstrate the application prospect of this patent.
Demonstrated the successful of this patent by this series of experiment, achieve and depart from the constraint that conventional ultrasound detects water, also reach the requirement of experiment.
Acoustic impedance:
The acoustic impedance of colloid couplant is measured.Couplant acoustic impedance is larger, then more mate with the acoustic impedance of probe and test specimen.1#-4# represents the new colloidal couplant under different ratio.1# is proportioning is (0.0065g/ml), and 2# is proportioning is (0.008g/ml), and 3# is proportioning is (0.01g/ml), and 4# is proportioning is (0.012g/ml).From measurement result 1# best results.I.e. 1.3g powder and 200ml water proportioning.
The density of some couplant of table 1 and the colloid couplant of making, the velocity of sound and acoustic impedance compare
Velocity of wave:
Application 1#-4# and the surface wave velocity of wave of water to aluminium are measured.Measurement result is as figure.
As when Fig. 7 can find out 1# and the measurement of water water and result the most identical, and measurement result is consistent with the surface wave velocity of wave theoretical value of aluminium.Mate most so 1.3g joins the more than acoustic impedance of 200ml water, be also best in measurement.
Because we will measure the surface wave velocity of wave of material, need to carry out defocusing test, namely probe moves downward, Real-time Collection waveform situation.So the colloid couplant be configured to is unsuitable blocked up, 5mm longer than probe radius.Because this couplant does not have viscosity, so do not worry removing problem.

Claims (3)

1. based on a colloid couplant for Ultrasonic Detection, it is characterized in that described colloid couplant with water for carrying, konjaku flour and seawood meal form; Konjaku flour mixes by 9:1 mass ratio with seawood meal; 1.3g mixed-powder joins 200ml water, and water is boiling water, while pouring mixed-powder into, stirs boiling water, mixes and treat that it cools.
2. according to the application of the colloid couplant based on Ultrasonic Detection described in claim 1, it is characterized in that: be applied to Ultrasonic Detection, within the long 5mm of colloid couplant Thickness Ratio probe radius.
3. according to the application described in claim 2, it is characterized in that: the hardware device of ultrasonic testing system comprises embedded computer, motion drive, oscillograph, four axes motion mechanism, ultrasonic pulse excitation/receiving instrument, line focus PVDF ultrasonic probe hereinafter referred to as probe, wherein embedded computer is connected with oscillograph, probe encourage with ultrasonic pulse/and receiving instrument is connected, ultrasonic pulse excitation/receiving instrument connection oscillograph; During measurement, probe is fixed on the Z axis of four axes motion mechanism, on test specimen platform, above test specimen, puts colloid couplant, allow probe and colloid couplant be coupled; By regulating calibrating installation and base, making probe vertical with surface of test piece, when echoed signal amplitude maximum, thinking that now probe is vertical with surface, starts to carry out defocusing measurement.
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Publication number Priority date Publication date Assignee Title
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
CN108562651A (en) * 2018-04-12 2018-09-21 长春工程学院 Pen type ultrasonic probe posture closed loop regulating device and method

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Publication number Priority date Publication date Assignee Title
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
CN108562651A (en) * 2018-04-12 2018-09-21 长春工程学院 Pen type ultrasonic probe posture closed loop regulating device and method
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

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