CN110109122A - A kind of device and method of the detection solid panel bottom target based on leakage Lamb wave - Google Patents

A kind of device and method of the detection solid panel bottom target based on leakage Lamb wave Download PDF

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Publication number
CN110109122A
CN110109122A CN201910451366.3A CN201910451366A CN110109122A CN 110109122 A CN110109122 A CN 110109122A CN 201910451366 A CN201910451366 A CN 201910451366A CN 110109122 A CN110109122 A CN 110109122A
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solid panel
ultrasonic transducer
wave
angle
frequency
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CN110109122B (en
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胡中韬
廉国选
王小民
毛捷
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Institute of Acoustics CAS
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Institute of Acoustics CAS
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06—Systems determining the position data of a target
    • G01S15/46—Indirect determination of position data
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/06—Systems determining the position data of a target
    • G01S15/46—Indirect determination of position data
    • G01S2015/465—Indirect determination of position data by Trilateration, i.e. two transducers determine separately the distance to a target, whereby with the knowledge of the baseline length, i.e. the distance between the transducers, the position data of the target is determined

Abstract

The invention belongs to supersonic sounding equipment technical fields, more particularly to a kind of device of detection solid panel bottom target based on leakage Lamb wave comprising: the first signal projector, the first oscillograph, the first ultrasonic transducer (1), second signal transmitter, the second oscillograph, the second ultrasonic transducer (2), solid panel (5) and data processing module；Solid panel bottom target (3) is placed in the lower section of solid panel (5), and the first ultrasonic transducer (1) and the second ultrasonic transducer (2) are staggered relatively, and the two is placed on solid panel (5)；First ultrasonic transducer (1) and the second ultrasonic transducer (2) cant angle theta angle；Also be linked in sequence the first signal projector and the first oscillograph on first ultrasonic transducer (1), (2) also sequential connection second signal transmitter and the second oscillograph on the second ultrasonic transducer；The data processing module, for according to L1And L2, calculate the horizontal position and upright position of solid panel bottom target (3).

Description

A kind of device and method of the detection solid panel bottom target based on leakage Lamb wave
Technical field
The invention belongs to supersonic sounding equipment technical field, in particular to a kind of detection solid panel bottom based on leakage Lamb wave The device and method of portion's target utilizes the horizontal position and upright position of the bottom target of the opaque solid panel of ultrasonic listening.
Background technique
Lamb wave is a kind of guided wave being formed in solid panel, has Dispersion, can pass through Rayleigh-orchid nurse frequency dispersion side Journey obtains phase (group) speed of each mode and the relationship of the thick product of frequency.Small due to decaying in Lamb wave communication process, propagation distance is remote, Most detection range can be covered in a short time, be widely used in large-area sheet, shell structure non-destructive testing with And the technical fields such as material thickness measurement.
Currently, since light can not penetrate opaque solid panel, the bottom target of solid panel is difficult to optically It is positioned.Existing acoustic method can penetrate opaque medium, be widely used in hydrospace detection and non-destructive testing etc.. Therefore, for the detection of the bottom target of solid panel, acoustic method can be used.But the acoustic measurement side received based on a hair one Method needs to carry out actual measurement to the concrete condition under solid panel point by point, and incident bulk wave vertically penetrates lamina and will cause relatively by force Energy loss.Therefore, one hair one receive formula bulk wave measurement method there are inefficiency, it is complicated for operation the problems such as.
Summary of the invention
It is an object of the present invention to which the invention proposes one kind to solve drawbacks described above existing for existing detection method The devices and methods therefor of detection solid panel bottom target based on leakage Lamb wave, can cylindrical body target to solid panel bottom, Position both horizontally and vertically is positioned.Using two ultrasonic transducers emit respectively ultrasonic wave be incident on it is water-immersed Identical Lamb wave is generated in solid panel, the part energy of the Lamb wave will drain in water around, and become leakage Lamb wave.It lets out The Lamb wave energy drained in water will form two identical plane waves with θ angle, frequency f；Two plane wave difference Propagate to the cylindrical body target location of solid panel bottom, and interact therewith, formed two with θ angle, frequency f it is anti- Ejected wave.Two back waves will be reflected back in solid panel respectively, motivate identical leakage Lamb wave, which will be along original Incident path is back to corresponding former ultrasonic transducer, is received by corresponding former ultrasonic transducer；Pass through the back wave of return The radius of the cylindrical body target of propagation time and solid panel bottom, can cylindrical body target to solid panel bottom horizontal and vertical Histogram to position be determined.
To achieve the goals above, the invention proposes a kind of dresses of detection solid panel bottom target based on leakage Lamb wave Set, which is arranged in the ultrasonic transducers of solid board ends using a pair, respectively successively with identical identical θ angle, Frequency f emits ultrasonic wave towards the center of solid panel, and propagates to the cylindrical body target location of solid panel bottom, and with its phase Interaction forms the back wave with θ angle, frequency f.The back wave will reflect back into solid panel, and it is blue to motivate identical leakage Nurse wave, the leakage Lamb wave will be back to former ultrasonic transducer along former incident path, be received by former ultrasonic transducer；Pass through return Back wave propagation time and solid panel bottom cylindrical body target radius, can cylindrical body target to solid panel bottom It is determined in position both horizontally and vertically.
The detection device specifically includes: the first signal projector, the first oscillograph, the first ultrasonic transducer, second signal Transmitter, the second oscillograph, the second ultrasonic transducer, solid panel and data processing module；
First ultrasonic transducer, the second ultrasonic transducer, solid panel, solid panel bottom target are respectively positioned on underwater；Solid Plate bottom target is placed in the lower section of solid panel, and the first ultrasonic transducer and the second ultrasonic transducer are staggered relatively, and the two is placed in solid On body plate, and the two is with solid panel at a distance of Scm, and in same level；First ultrasonic transducer and the second ultrasound The equal cant angle theta angle of energy converter；Also be linked in sequence the first signal projector and the first oscillograph on first ultrasonic transducer, the second surpasses Also be linked in sequence second signal transmitter and the second oscillograph on sonic transducer；
The data processing module, the ultrasonic wave of θ angle, frequency f for being emitted according to the first ultrasonic transducer is solid The distance L propagated in body plate1With the second ultrasonic transducer transmitting θ angle, frequency f ultrasonic wave propagated in solid panel away from From L2, calculate the horizontal position and upright position of solid panel bottom target；Wherein, solid panel bottom target is cylindrical body target.
One of as an improvement of the above technical solution, the θ=arcsin (Cw/Cp), wherein Cp is the phase velocity of Lamb wave Degree；Cw is the velocity of sound.
One of as an improvement of the above technical solution, the solid panel is opaque metal plate；Preferably aluminium sheet.
One of as an improvement of the above technical solution, the data processing module specifically includes:
First data receipt unit, for receiving the ultrasonic wave of the θ angle of the first ultrasonic transducer transmitting, frequency f solid Propagation time t in body plate1；
First processing units, the ultrasonic wave of θ angle, frequency f for being emitted according to the first ultrasonic transducer is in solid panel Middle propagation time t1；The distance that the sound wave of the super θ angle, frequency f that calculate the transmitting of the first ultrasonic transducer is propagated in solid panel L1；
L1=Cwt0·sinθ+Cg·(t1-2t0)/2 (1)
Wherein, t0For the propagation time of ultrasonic wave in water, t0=S/Cw；Cg is the group velocity of Lamb wave；Cw is the velocity of sound；θ =arcsin (Cw/Cp), wherein Cp is the phase velocity of Lamb wave；t1For the first received leakage being reflected back of ultrasonic transduction energy device The propagation time of Lamb wave；
Second data receipt unit, for receiving the ultrasonic wave of the θ angle of the second ultrasonic transducer transmitting, frequency f solid Propagation time t in body plate2；
The second processing unit, the ultrasonic wave of θ angle, frequency f for being emitted according to the second ultrasonic transducer is in solid panel Middle propagation time t2；The distance that the ultrasonic wave of the θ angle, frequency f that calculate the transmitting of the second ultrasonic transducer is propagated in solid panel L2；
L2=Cwt0·sinθ+Cg·(t2-2t0)/2 (2)
Wherein, t1For the propagation time of the received leakage Lamb wave being reflected back of the second ultrasonic transducer；
Third processing unit, for according to L1And L2, calculate horizontal position D and its upright position of solid panel bottom target h；
Wherein, L is the distance between the first ultrasonic transducer and the second ultrasonic transducer；R is solid panel bottom target Radius.
Based on the device of the above-mentioned detection solid panel bottom target based on leakage Lamb wave, the present invention also provides one kind to be based on The method of the detection solid panel bottom target of Lamb wave is leaked, this method can be across solid panel, to solid panel bottom target in level It is positioned with the position of vertical direction, the detection method is succinct and has degree of precision.It specifically includes:
The ultrasonic wave of the θ angle, frequency f that obtain the transmitting of the first ultrasonic transducer propagation time t in solid panel1；
The ultrasonic wave of the θ angle, frequency f that obtain the transmitting of the second ultrasonic transducer propagation time t in solid panel2；
According to t1And t2, the ultrasonic wave of the θ angle, frequency f that respectively correspondingly calculate the transmitting of the first ultrasonic transducer is in solid The distance L propagated in plate1The distance propagated in solid panel with the θ angle of the second ultrasonic transducer transmitting, the ultrasonic wave of frequency f For L2；
According to L1And L2, calculate the horizontal position D and its upright position h of solid panel bottom target.
One of as an improvement of the above technical solution, the θ angle for obtaining the transmitting of the first ultrasonic transducer, frequency f Ultrasonic wave propagation time t in solid panel1；It specifically includes:
First signal projector emits electric signal to the first ultrasonic transducer, and the first ultrasonic transducer converts electrical signals to Ultrasonic wave, and emitted with the ultrasonic wave of incidence angle θ angle, frequency f into water-immersed solid panel, form Lamb wave；Leakage Leakage Lamb wave into water with θ angle, frequency f plane wave incidence to the outer surface of solid panel bottom target on, and and solid Plate bottom target interacts, and forms the back wave with θ angle, frequency f, the back wave is through solid panel bottom target Outer surface is reflected back solid panel, motivates identical leakage Lamb wave, and be back to by solid panel along former incident path and the first surpass Sonic transducer, the first ultrasonic transducer receive the leakage Lamb wave being reflected back, and blue by the leakage that the first oscilloscope display is reflected back Nurse involves its propagation time t1。
One of as an improvement of the above technical solution, the θ angle for obtaining the transmitting of the second ultrasonic transducer, frequency f Ultrasonic wave propagation time t in solid panel2；It specifically includes:
Second signal transmitter emits electric signal to the second ultrasonic transducer, and the second ultrasonic transducer converts electrical signals to Ultrasonic wave, and emitted with the ultrasonic wave of incidence angle θ angle, frequency f into water-immersed solid panel, form Lamb wave；Leakage Leakage Lamb wave into water with θ angle, frequency f plane wave incidence to the outer surface of solid panel bottom target on, and and solid Plate bottom target interacts, and forms the back wave with θ angle, frequency f, the back wave is through solid panel bottom target Outer surface is reflected back solid panel, motivates identical leakage Lamb wave, and be back to by solid panel along former incident path and the second surpass Sonic transducer, the second ultrasonic transducer receive the leakage Lamb wave being reflected back, and blue by the leakage that the second oscilloscope display is reflected back Nurse involves its propagation time t2。
One of as an improvement of the above technical solution, it is described according to t1And t2, respectively correspondingly calculate the first ultrasonic transducer The distance L that the θ angle of transmitting, the ultrasonic wave of frequency f are propagated in solid panel1θ angle, frequency with the transmitting of the second ultrasonic transducer The distance that the ultrasonic wave of rate f is propagated in solid panel is L2；It specifically includes:
The distance L that the θ angle of first ultrasonic transducer transmitting, frequency f ultrasonic wave are propagated in solid panel1Are as follows:
L1=Cwt0·sinθ+Cg·(t1-2t0)/2 (1)
Wherein, t0For the propagation time of ultrasonic wave in water, t0=S/Cw；Cg is the group velocity of Lamb wave；Cw is the velocity of sound；θ =arcsin (Cw/Cp), wherein Cp is the phase velocity of Lamb wave；t1For the first received leakage being reflected back of ultrasonic transduction energy device The propagation time of Lamb wave；
The distance L that the θ angle of second ultrasonic transducer transmitting, the ultrasonic wave of frequency f are propagated in solid panel2Are as follows:
L2=Cwt0·sinθ+Cg·(t2-2t0)/2 (2)
Wherein, t1For the propagation time of the received leakage Lamb wave being reflected back of the second ultrasonic transducer.
One of as an improvement of the above technical solution, it is described according to L1And L2, calculate the horizontal position of solid panel bottom target D and its upright position h；It specifically includes:
Wherein, L is the distance between the first ultrasonic transducer and the second ultrasonic transducer；R is solid panel bottom target Radius.
The beneficial effect of the present invention compared with the prior art is:
Method of the invention can calculate the horizontal position and its upright position of solid panel bottom target in a short time, It determines that solid panel bottom target is located at the specific location of solid panel bottom, realizes quick, the precise positioning of solid panel bottom target.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the device of detection solid panel bottom target based on leakage Lamb wave of the invention；
Fig. 2 is that the first ultrasound in a kind of device of detection solid panel bottom target based on leakage Lamb wave of the invention is changed Energy device, the second ultrasonic transducer, solid panel, cylindrical body target immerse the structural schematic diagram of underwater；
Fig. 3 is the phase of the solid panel in a kind of device of detection solid panel bottom target based on leakage Lamb wave of the invention Velocity dispersion curve, wherein A0, S0, A1, S1, A2, S2 are each Lamb Waves modes；
Fig. 4 is the group of the solid panel in a kind of device of detection solid panel bottom target based on leakage Lamb wave of the invention Velocity dispersion curve, wherein A0, S0, A1, S1, A2, S2 are each Lamb Waves modes；
Fig. 5 is declining for the solid panel in a kind of device of detection solid panel bottom target based on leakage Lamb wave of the invention Subtract dispersion curve, wherein A0, S0, A1, S1, A2, S2 are each Lamb Waves modes；
Fig. 6 is that the first ultrasound in a kind of device of detection solid panel bottom target based on leakage Lamb wave of the invention is changed Can device receive back wave when m- relative amplitude curve graph, record propagation time t1；
Fig. 7 is that the second ultrasound in a kind of device of detection solid panel bottom target based on leakage Lamb wave of the invention is changed Can device receive back wave when m- relative amplitude curve graph, record propagation time t2.
Appended drawing reference:
1, the first ultrasonic transducer 2, the second ultrasonic transducer
3, cylindrical body target 4, the water surface
5, solid panel 6, container
Specific embodiment
Now in conjunction with attached drawing, the invention will be further described.
As illustrated in fig. 1 and 2, the invention proposes it is a kind of based on leakage Lamb wave detection solid panel bottom target device, A part of the detection device is placed in the container for being contained with water, which is arranged in the super of solid board ends using a pair Sonic transducer successively emits ultrasonic wave towards the center of solid panel with identical identical θ angle, frequency f respectively, and propagates to solid The cylindrical body target location in body board bottom portion, and interact therewith, form the back wave with θ angle, frequency f.The reflection Wave will reflect back into solid panel, motivate identical leakage Lamb wave, which will be back to former super along former incident path Sonic transducer is received by former ultrasonic transducer；Pass through the propagation time of the back wave of return and the cylindrical body of solid panel bottom The radius of target, can the cylindrical body target to solid panel bottom be determined in position both horizontally and vertically.
The detection device specifically includes: the first signal projector, the first oscillograph, the first ultrasonic transducer 1, second signal Transmitter, the second oscillograph, the second ultrasonic transducer 2, solid panel 5 and data processing module；
First ultrasonic transducer 1, the second ultrasonic transducer 2, solid panel 5, solid panel bottom target 3 are respectively positioned on and are placed with water In container 6, that is, it is located under the water surface 4；Solid panel bottom target 3 is placed in the lower section of solid panel 5, the first ultrasonic transducer 1 and second Ultrasonic transducer 2 is staggered relatively, and the two is placed on solid panel 5, and the two is in same level, and with solid panel 5 At a distance of Scm；First ultrasonic transducer 1 and the equal cant angle theta angle of the second ultrasonic transducer 2；Also sequentially connect on first ultrasonic transducer 1 The first signal projector and the first oscillograph are connect, be also linked in sequence second signal transmitter and second on the second ultrasonic transducer 2 Oscillograph；
The data processing module, the ultrasonic wave of θ angle, frequency f for being emitted according to the first ultrasonic transducer 1 is solid The distance L propagated in body plate 51It is propagated in solid panel 5 with the θ angle of the second ultrasonic transducer 2 transmitting, the ultrasonic wave of frequency f Distance L2, the horizontal position and its upright position of solid panel bottom target 3 are calculated, detection solid panel bottom target 3 is completed Specific location.
Wherein, if each function in the data processing module is realized in the form of SFU software functional unit and as only Vertical product when selling or using, can store the non-volatile computer-readable storage medium that can be performed in a processor In.Based on this understanding, technical solution of the present invention substantially in other words the part that contributes to existing technology or should The part of technical solution can be embodied in the form of software products, which is stored in a storage medium In, including some instructions use is so that a computer equipment (can be personal computer, server or the network equipment etc.) It performs all or part of the steps of the method described in the various embodiments of the present invention.And storage medium above-mentioned includes: USB flash disk, moves firmly Disk, read-only memory (ROM, ReadOnly Memory), random access memory (RAM, Random Access Memory), The various media that can store program code such as magnetic or disk.
Wherein, the θ=arcsin (Cw/Cp), wherein Cp is the phase velocity of Lamb wave；Cw is the velocity of sound.
The solid panel is opaque metal plate；Preferably aluminium sheet.
The data processing module specifically includes:
First data receipt unit, for receiving the ultrasonic wave of the θ angle of the first ultrasonic transducer 1 transmitting, frequency f solid Propagation time t in body plate 51；
First processing units, the ultrasonic wave of θ angle, frequency f for being emitted according to the first ultrasonic transducer 1 is in solid panel Propagation time t in 51；Calculate the first ultrasonic transducer 1 transmitting θ angle, frequency f ultrasonic wave propagated in solid panel 5 away from From L1；
L1=Cwt0·sinθ+Cg·(t1-2t0)/2 (1)
Wherein, t0For the propagation time of ultrasonic wave in water, t0=S/Cw；Cg is the group velocity of Lamb wave；Cw is the velocity of sound；θ =arcsin (Cw/Cp), wherein Cp is the phase velocity of Lamb wave；t1For the first received leakage being reflected back of ultrasonic transduction energy device The propagation time of Lamb wave；
Second data receipt unit, for receiving the ultrasonic wave of the θ angle of the second ultrasonic transducer 2 transmitting, frequency f solid Propagation time t in body plate 52；
The second processing unit, the ultrasonic wave of θ angle, frequency f for being emitted according to the second ultrasonic transducer 2 is in solid panel Propagation time t in 52；Calculate the second ultrasonic transducer 2 transmitting θ angle, frequency f ultrasonic wave propagated in solid panel 5 away from From L2；
L2=Cwt0·sinθ+Cg·(t2-2t0)/2 (2)
Wherein, t1For the propagation time of the received leakage Lamb wave being reflected back of the second ultrasonic transduction energy device；
Third processing unit, for according to L1And L2, calculate horizontal position D and its upright position of solid panel bottom target h；
Wherein, L is the distance between the first ultrasonic transducer and the second ultrasonic transducer；R is solid panel bottom target Radius.
Based on the device of the above-mentioned detection solid panel bottom target based on leakage Lamb wave, the present invention also provides one kind to be based on The method of the detection solid panel bottom target of Lamb wave is leaked, this method can be across solid panel, to the cylindrical body mesh of solid panel bottom Mark, is positioned in position both horizontally and vertically, and the detection method is succinct and has degree of precision.It specifically includes:
Assuming that the velocity of longitudinal wave Cl of solid panel material, solid panel material shear wave velocity Cs, solid panel material density p1, solid The density p of the plate thickness d of plate material, liquid2, velocity of sound Cw, nurse wave wave number k and Lamb wave frequencies omega, the frequency dispersion according to immersion liquid plate Equation:
Wherein, kL=ω/Cl is body longitudinal wave wave number in solid panel；kT=ω/Cs is body shear wave wave number； I is imaginary part；Wherein coth () is hyperbolic cotangent；Tanh () is hyperbolic tangent function；
Phase velocity-frequency of the blue nurse mode of S series of the leakage Lamb wave in immersion liquid solid panel can be obtained according to above-mentioned formula (5) The dispersion curve of the dispersion curve of rate, group velocity-frequency dispersion curve and attenuation versus frequency；Specifically, as in Fig. 3,4 and 5 , phase velocity-frequency dispersion curve, group velocity-frequency dispersion curve and the attenuation versus frequency of S0, S1, S2 orchid nurse mode Dispersion curve；
Phase velocity-frequency of the blue nurse mode of A series of the leakage Lamb wave in immersion liquid solid panel can be obtained according to above-mentioned formula (6) The dispersion curve of the dispersion curve of rate, group velocity-frequency dispersion curve and attenuation versus frequency；Specifically, as in Fig. 3,4 and 5 , phase velocity-frequency dispersion curve, group velocity-frequency dispersion curve and the attenuation versus frequency of A0, A1, A2 orchid nurse mode Dispersion curve；
According to phase velocity-frequency dispersion curve, the group velocity-frequency dispersion curve of the blue nurse mode of the A of acquisition series And the dispersion curve of attenuation versus frequency, select phase velocity-frequency dispersion curve, the group velocity-of any blue nurse mode of A series The dispersion curve of frequency and the dispersion curve of attenuation versus frequency determine under corresponding blue nurse mode according to Fig. 3,4 and 5 Group velocity Cg and phase velocity Cp；Based on determining group velocity Cg and phase velocity Cp；Using θ=arcsin (Cw/Cp), ultrasound is determined The incident angle θ of wave；Further according to based on determining group velocity Cg and phase velocity Cp；Determine determining group velocity Cg and phase velocity Cp Corresponding frequency f；Wherein, the range of choice of the frequency f of ultrasonic wave is determined by decaying dispersion curve, for example, the A of selection1Mode Decaying need to meet greater than S0 mode, be less than A1 mode；
θ angle, frequency f based on above-mentioned determination obtain θ angle, the ultrasound of frequency f of the transmitting of the first ultrasonic transducer 1 Wave propagation time t in solid panel 51；Specifically,
First signal projector emits electric signal to the first ultrasonic transducer, and the first ultrasonic transducer converts electrical signals to Ultrasonic wave, and emitted with the ultrasonic wave of incidence angle θ angle, frequency f into water-immersed solid panel, form Lamb wave；Leakage Leakage Lamb wave into water with θ angle, frequency f plane wave incidence to the outer surface of solid panel bottom target on, and and solid Plate bottom target interacts, and forms the back wave with θ angle, frequency f, the back wave is through solid panel bottom target Outer surface is reflected back solid panel, motivates identical leakage Lamb wave, and be back to by solid panel along former incident path and the first surpass Sonic transducer, the first ultrasonic transducer receive the leakage Lamb wave being reflected back, and blue by the leakage that the first oscilloscope display is reflected back Nurse involves its propagation time t1, as shown in Figure 6.
The ultrasonic wave of the θ angle, frequency f that obtain the transmitting of the second ultrasonic transducer propagation time t in solid panel2；Specifically Include:
Second signal transmitter emits electric signal to the second ultrasonic transducer, and the second ultrasonic transducer converts electrical signals to Ultrasonic wave, and emitted with the ultrasonic wave of incidence angle θ angle, frequency f into water-immersed solid panel, form Lamb wave；Leakage Leakage Lamb wave into water with θ angle, frequency f plane wave incidence to the outer surface of solid panel bottom target on, and and solid Plate bottom target interacts, and forms the back wave with θ angle, frequency f, the back wave is through solid panel bottom target Outer surface is reflected back solid panel, motivates identical leakage Lamb wave, and be back to by solid panel along former incident path and the second surpass Sonic transducer, the second ultrasonic transducer receive the leakage Lamb wave being reflected back, and blue by the leakage that the second oscilloscope display is reflected back Nurse involves its propagation time t2, as shown in Figure 7.
According to t1And t2, the ultrasonic wave of the θ angle, frequency f that respectively correspondingly calculate the transmitting of the first ultrasonic transducer 1 is solid The distance L propagated in body plate 51It is propagated in solid panel 5 with the θ angle of the second ultrasonic transducer 2 transmitting, the ultrasonic wave of frequency f Distance be L2；It specifically includes:
The distance L that the θ angle of first ultrasonic transducer transmitting, the ultrasonic wave of frequency f are propagated in solid panel1Are as follows:
L1=Cwt0·sinθ+Cg·(t1-2t0)/2 (1)
Wherein, t0For the propagation time of ultrasonic wave in water, t0=S/Cw；Cg is the group velocity of Lamb wave；Cw is the velocity of sound；θ =arcsin (Cw/Cp), wherein Cp is the phase velocity of Lamb wave；t1For the first received leakage being reflected back of ultrasonic transduction energy device The propagation time of Lamb wave；
The distance L that the θ angle of second ultrasonic transducer transmitting, the ultrasonic wave of frequency f are propagated in solid panel2Are as follows:
L2=Cwt0·sinθ+Cg·(t2-2t0)/2 (2)
Wherein, t1For the propagation time of the received leakage Lamb wave being reflected back of the second ultrasonic transducer；
According to L1And L2, calculate the horizontal position D and its upright position h of solid panel bottom target；It specifically includes:
Wherein, L is the distance between the first ultrasonic transducer and the second ultrasonic transducer；R is solid panel bottom target Radius.
Embodiment 1:
In the present embodiment, the solid panel 5 is aluminium sheet, and the solid panel bottom target is steel column target, the present embodiment The mainly horizontal position and upright position of the steel column target of verifying detection aluminium sheet bottom, can determine aluminium sheet bottom across aluminium sheet The horizontal position D and upright position h of the steel column target in portion, measurement method is succinct and has degree of precision.
Wherein, the velocity of longitudinal wave Cl=6300m/s of aluminium sheet, shear wave velocity Cs=3100m/s, density ρ1=2700kg/ m3, thickness d=2.45mm of aluminium sheet, velocity of sound Cw=1500m/s, density ρ in water2=1000kg/m3。
The information of the above plate and water is updated to the dispersion equation of plate by we, can be solved in immersion liquid solid panel and be leaked Lamb wave Phase, group velocity and decaying dispersion curve, if Fig. 3 be immersion liquid plate phase velocities dispersion curve, Fig. 4 be immersion liquid plate group velocity Dispersion curve, Fig. 5 are the decaying dispersion curve of immersion liquid plate.
As shown in Fig. 3 black mark point, we select A1The frequency of mode is 1438kHz, and point decaying, which meets, is greater than S0Mould Formula is less than A1Mode.Group velocity is Cg=3235m/s.Phase velocity is Cp=5488m/s, can obtain incident angle θ are as follows: θ= Arcsin (Cw/Cp)=15.86 °；
First ultrasonic transducer 1 the height S=0.7cm at a distance of aluminium sheet, height S of second ultrasonic transducer 2 at a distance of aluminium sheet =0.7cm；The propagation time t of ultrasonic wave in water0=S/Cw=4.6 μ s is generated in aluminium sheet using the first ultrasonic transducer 1 A1Mode leaks Lamb wave, and the echo-signal generated with steel column objectives interation is received using the first ultrasonic transducer 1, and By the first oscillograph, its propagation time t is recorded1Therefore=42.79 μ s can obtain the ultrasound emitted by the first ultrasonic transducer 1 The distance L that wave is propagated in aluminium sheet1Are as follows:
L1=Cwt0·sinθ+Cg·(t1-2t0)/2=5.622cm
Identical A is generated in aluminium sheet using the second ultrasonic transducer 21Mode is (identical to refer to second transducer and first Energy converter is identical, and A1 mode also has different situations, herein refers to identical A1 mode) leakage Lamb wave, and using second ultrasound Energy converter 2 receives the echo-signal generated with steel column objectives interation, and by the second oscillograph, records its propagation time t2=52.36 μ s.Therefore the distance L propagated in aluminium sheet by the ultrasonic wave that the second ultrasonic transducer 2 emits can be obtained2Are as follows:
L2=Cwt0·sinθ+Cg·(t2-2t0)/2=7.170cm
Wherein, the radius of steel column target is r=3.5cm, the distance L=10cm of two energy converters, accordingly, it can be determined that steel column The horizontal position D of body target is indicated are as follows:
The upright position h of steel column target may be expressed as:
Above using o point as origin, the judgement of the horizontal distance and vertical range of steel column target is carried out.By practical survey Amount, the real standard position of steel column target and upright position be respectively as follows: D '=4.430 ± 0.001cm, h '=0.315 ± 0.001cm。
And the real standard position and upright position of the steel column target being calculated by means of the present invention are respectively D =4.226cm；H=0.329cm；Compared with actual measured results, the position error of this method is 5%.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng It is described the invention in detail according to embodiment, those skilled in the art should understand that, to technical side of the invention Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention Scope of the claims in.

Claims (9)

1. a kind of device of the detection solid panel bottom target based on leakage Lamb wave, characterized in that it comprises: the first signal hair Emitter, the first oscillograph, the first ultrasonic transducer (1), second signal transmitter, the second oscillograph, the second ultrasonic transducer (2), solid panel (5) and data processing module；
First ultrasonic transducer (1), the second ultrasonic transducer (2), solid panel (5), solid panel bottom target (3) are respectively positioned on the water surface Under；Solid panel bottom target (3) is placed in the lower section of solid panel (5), the first ultrasonic transducer (1) and the second ultrasonic transducer (2) Staggered relatively, the two is placed on solid panel (5), and in same level；First ultrasonic transducer (1) and the second ultrasound Energy converter (2) cant angle theta angle；Also be linked in sequence the first signal projector and the first oscillograph on first ultrasonic transducer (1), (2) also sequential connection second signal transmitter and the second oscillograph on second ultrasonic transducer；
The data processing module, the ultrasonic wave of θ angle, frequency f for being emitted according to the first ultrasonic transducer (1) is in solid The distance L propagated in plate (5)1The ultrasonic wave of the θ angle, frequency f that emit with the second ultrasonic transducer (2) is in solid panel (5) The distance L propagated2, calculate the horizontal position and upright position of solid panel bottom target (3)；Wherein, solid panel bottom mesh Marking (3) is cylindrical body target.
2. the device of the detection solid panel bottom target according to claim 1 based on leakage Lamb wave, which is characterized in that institute State θ=arcsin (Cw/Cp)；Wherein, Cp is the phase velocity of Lamb wave；Cw is the velocity of sound.
3. the device of the detection solid panel bottom target according to claim 1 based on leakage Lamb wave, which is characterized in that institute Stating solid panel is opaque metal plate.
4. the device of the detection solid panel bottom target according to claim 1 based on leakage Lamb wave, which is characterized in that institute Data processing module is stated to specifically include:
First data receipt unit, the ultrasonic wave of the θ angle, frequency f that are used to receive the first ultrasonic transducer (1) transmitting is in solid Propagation time t in plate (5)1；
First processing units, the ultrasonic wave of θ angle, frequency f for being emitted according to the first ultrasonic transducer (1) is in solid panel (5) propagation time t in1；The sound wave of the super θ angle, frequency f that calculate the first ultrasonic transducer (1) transmitting passes in solid panel (5) The distance L broadcast1；
L1=Cwt0·sinθ+Cg·(t1-2t0)/2 (1)
Wherein, t0For the propagation time of ultrasonic wave in water, t0=S/Cw；Cg is the group velocity of Lamb wave；
Second data receipt unit, the ultrasonic wave of the θ angle, frequency f that are used to receive the second ultrasonic transducer (2) transmitting is in solid Propagation time t in plate (5)2；
The second processing unit, the ultrasonic wave of θ angle, frequency f for being emitted according to the second ultrasonic transducer (2) is in solid panel (5) propagation time t in2；The ultrasonic wave of the θ angle, frequency f that calculate the second ultrasonic transducer (2) transmitting passes in solid panel (5) The distance L broadcast2；
L2=Cwt0·sinθ+Cg·(t2-2t0)/2 (2)
Third processing unit, for according to L1And L2, calculate the horizontal position D and its upright position h of solid panel bottom target (3)；
Wherein, L is the distance between the first ultrasonic transducer and the second ultrasonic transducer；R is the radius of solid panel bottom target.
5. a kind of method of the detection solid panel bottom target based on leakage Lamb wave, this method is based on any in claim 1-4 The device is realized, which comprises
The ultrasonic wave of the θ angle, frequency f that obtain the first ultrasonic transducer (1) transmitting propagation time t in solid panel (5)1；
The ultrasonic wave of the θ angle, frequency f that obtain the second ultrasonic transducer (2) transmitting propagation time t in solid panel (5)2；
According to t1And t2, the ultrasonic wave of the θ angle, frequency f that respectively correspondingly calculate the first ultrasonic transducer (1) transmitting is in solid The distance L propagated in plate (5)1The ultrasonic wave of the θ angle, frequency f that emit with the second ultrasonic transducer (2) is in solid panel (5) The distance of propagation is L2；
According to L1And L2, calculate the horizontal position D and its upright position h of solid panel bottom target (3).
6. according to the method described in claim 5, it is characterized in that, the θ angle for obtaining the transmitting of the first ultrasonic transducer, frequency The ultrasonic wave of rate f propagation time t in solid panel1；It specifically includes:
First signal projector emits electric signal to the first ultrasonic transducer, and the first ultrasonic transducer (1) converts electrical signals to Ultrasonic wave, and emitted with the ultrasonic wave of incidence angle θ angle, frequency f into water-immersed solid panel (5), form Lamb wave；It lets out Reveal the leakage Lamb wave in water with θ angle, frequency f plane wave incidence to the outer surface of solid panel bottom target on, and with it is solid Body plate bottom target (3) interacts, and forms the back wave with θ angle, frequency f, the back wave is through solid panel bottom The outer surface of target is reflected back solid panel (5), motivates identical leakage Lamb wave, and by solid panel (5) along former incident path It is back to the first ultrasonic transducer (1), the first ultrasonic transducer (1) receives the leakage Lamb wave being reflected back, and passes through the first oscillography Device shows the leakage Lamb wave and its propagation time t being reflected back1。
7. according to the method described in claim 5, it is characterized in that, the θ angle for obtaining the transmitting of the second ultrasonic transducer, frequency The ultrasonic wave of rate f propagation time t in solid panel2；It specifically includes:
Second signal transmitter emits electric signal to the second ultrasonic transducer (2), and the second ultrasonic transducer (2) converts electric signal For ultrasonic wave, and emitted with the ultrasonic wave of incidence angle θ angle, frequency f into water-immersed solid panel (5), forms Lamb wave； Be leaked in water leakage Lamb wave with θ angle, frequency f plane wave incidence to the outer surface of solid panel bottom target on, and with Solid panel bottom target (3) interacts, and forms the back wave with θ angle, frequency f, the back wave is through solid panel bottom The outer surface of portion's target is reflected back solid panel (5), motivates identical leakage Lamb wave, and enter rays along original by solid panel (5) Diameter is back to the second ultrasonic transducer (2), and the second ultrasonic transducer (2) receives the leakage Lamb wave being reflected back, and shows by second Wave device shows the leakage Lamb wave and its propagation time t being reflected back2。
8. according to the method described in claim 5, it is characterized in that, described according to t1And t2, respectively correspondingly calculate the first ultrasound The distance L that the θ angle of energy converter (1) transmitting, the ultrasonic wave of frequency f are propagated in solid panel (5)1With the second ultrasonic transducer (2) distance that the ultrasonic wave of the θ angle, frequency f that emit is propagated in solid panel (5) is L2；It specifically includes:
The distance L that the θ angle of first ultrasonic transducer (1) transmitting, frequency f ultrasonic wave are propagated in solid panel (5)1Are as follows:
L1=Cwt0·sinθ+Cg·(t1-2t0)/2 (1)
Wherein, t0For the propagation time of ultrasonic wave in water, t0=S/Cw；Cg is the group velocity of Lamb wave；
The distance L that the θ angle of second ultrasonic transducer (2) transmitting, the ultrasonic wave of frequency f are propagated in solid panel (5)2Are as follows:
L2=Cwt0·sinθ+Cg·(t2-2t0)/2 (2)。
9. according to the method described in claim 5, it is characterized in that, described according to L1And L2, calculate solid panel bottom target (3) Horizontal position D and its upright position h；It specifically includes:
Wherein, L is the distance between the first ultrasonic transducer and the second ultrasonic transducer；R is the radius of solid panel bottom target.
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