WO2018045497A1

WO2018045497A1 - Arc surface sound gathering waveguide device applicable to field of ultrasonic thickness measurement

Info

Publication number: WO2018045497A1
Application number: PCT/CN2016/098266
Authority: WO
Inventors: 郑丽群; 李欣波; 周光森; 杨阳; 杨富淋
Original assignee: 沈阳中科韦尔腐蚀控制技术有限公司
Priority date: 2016-09-07
Filing date: 2016-09-07
Publication date: 2018-03-15

Abstract

An arc surface sound gathering waveguide device applicable to the field of ultrasonic thickness measurement. Under the condition that an ultrasonic wave does not has frequency dispersion and the fidelity is ensured, a surface of the arc surface sound gathering waveguide device in contact with a surface of a transducer is a wide surface, which allows receiving energy of the transducer to the greatest extent and in the conduction process, allowing the received energy to be conducted to a slim and long rectangle narrow surface by means of an arc surface focusing manner. The received ultrasonic wave energy is not dispersed, and at most one time of reflection occurs in the whole ultrasonic wave conduction process, which effectively reduces energy attenuation, and reduces inducing factors enabling the ultrasonic wave to be dispersed in frequency or distorted. The arc surface sound gathering waveguide device is also applicable to connection with curved measurement surfaces of pipes and the like. In the technical solution, an ultrasonic wave is conducted from a wide surface to a narrow surface and is conducted from the narrow surface to the wide surface under the condition that energy is not lost, thereby resolving a practical problem in the field of ultrasonic thickness measurement.

Description

Description: A curved surface acoustic waveguide device suitable for ultrasonic thickness measurement

[0001] The present invention relates to a curved surface acoustic wave waveguide device for use in ultrasonic non-destructive testing, and is particularly suitable for pipe thickness detection of a high temperature pipe and a curved surface.

technical problem

[0002] The use of ultrasonic thickness measurement is a transparent and practical technique. The conventional method is to directly apply an ultrasonic probe made of an ultrasonic transducer to the surface of the object to be measured. The ultrasonic probe includes an emission acoustic transducer and a receiving acoustic wave exchange. The ultrasonic wave emitted by the sound wave transducer is reflected on the surface and the inner surface of the object to be measured, and the outer surface and the inner surface reflected wave are sequentially received by the transducer for receiving, according to two The inter-turn difference of the wave is multiplied by the speed of sound of the ultrasonic wave to calculate the thickness of the object to be measured.

[0003] In practical applications, especially in petroleum refining and chemical enterprises, there are many harsh environments with high temperature operation. The high temperature pipelines have insulation layers on the outside, and it is necessary to remove the insulation layer every time, and there are safety hazards in the high temperature environment. Therefore, the ultrasonic probe is permanently fixed to the outer surface of the pipe, and becomes an on-line fixed-point thickness measurement, so that the measuring personnel can go to the site without measuring, and the measurement signal is transmitted to the monitoring computer by wireless or wired means. However, the temperature of the pipe exterior is up to about 600 degrees Celsius. The ultrasonic probe cannot adapt to the high temperature environment between the long turns. Therefore, the ultrasonic guide becomes an option to transmit the ultrasonic wave through the waveguide to the object to be measured, so that the ultrasonic probe is placed. The position temperature is within its suitable temperature range.

[0004] Ultrasonic waves have two modes of vibration, shear wave and longitudinal wave. The longitudinal wave vibration direction is the same as the ultrasonic wave propagation direction, and the longitudinal wave penetration ability is weak. The transverse wave vibration direction is perpendicular to the ultrasonic wave transmission direction, and the transverse wave that vibrates only in one direction is called polarization wave, and the transverse wave penetration ability is strong. The appropriate waveguide device is selected according to the different vibration modes of the ultrasonic wave, so that the vibration frequency and the vibration mode of the ultrasonic wave are not changed, so that the acoustic wave detecting device can detect and effectively read a good reflected echo. Sound waves can only travel in a straight line. When they encounter obstacles, they will reflect and refract in the obstruction plane. Both reflection and refraction will cause energy loss. To select a waveguide, consider the following factors: "Do not change the vibration mode, reduce energy loss, and not disperse." For cylindrical waveguide rods, filamentary waveguide filaments, or waveguide bundles composed of several filaments, suitable for longitudinal waves; for rectangular-section waveguide rods or rectangular-section elongated waveguide strips, suitable for transverse waves. Passed by the above waveguide device Guided ultrasound is an existing technology.

[0005] The ultrasonic non-destructive testing patent of the patent number CN 101976562 A describes a case where a polarized transverse ultrasonic wave is transmitted in a rectangular elongated waveguide strip having a width to thickness ratio greater than 1, and FIG. 1 is one example of the patent. Taking Figure 1 as an example, its transmission characteristics are: Ultrasonic wave is a transverse wave polarized wave, which is a single vibration direction, the vibration direction is perpendicular to the ultrasonic wave transmitting direction, and parallel to the rectangular elongated waveguide band, the two widths are 15m flat. A beam of ultrasonic waves is emitted from a circular transducer with a circular cross section and enters the elongated waveguide strip along a rectangular cross section of 1×15 (mm). The ultrasonic waves can only propagate in a straight line and reflect to the other side after encountering the side wall of the waveguide strip. The wall, the ultrasonic wave is reflected back and forth between the two side walls of the waveguide strip until the outgoing waveguide strip enters the sample to be tested. The ultrasonic waves are reflected after encountering the bottom surface of the sample, and the reflected waves enter the receiving waveguide strip and are also transmitted along the waveguide strip to the transducer for reception. The elongated waveguide strip allows a small angle of bending deformation to be its main feature. The thickness of the waveguide strip is small and the two side walls are parallel even when the waveguide strip is bent, so that the ultrasonic wave can be ensured from the incident surface to the exit surface. The stroke is as short as possible, and the direction of the sound wave is consistent with the stroke, which can reduce energy loss and dispersion. The polarization direction of the ultrasonic wave is parallel to the two sides of the waveguide strip, ensuring that the ultrasonic wave is reflected between the two side walls, and the waveform of the sinusoidal oscillation is not scattered, thereby ensuring the frequency is constant, and the dispersion phenomenon is minimized, so that the receiving end can Received a high-fidelity reflection signal.

[0006] According to the above background art, there are problems:

[0007] 1) In petrochemical enterprises, most of the objects to be tested are circular pipes. In the above known waveguide device, a cylindrical or rectangular waveguide rod, as shown in Fig. 2, is in line contact with the circular outer wall of the pipe. Even in the case of compression deformation, the contact surface is basically lmm, and the contact surface can only be enlarged by using a couplant, and the coupling agent is only used instantaneously, in the case of constant contact between the thickness measuring probe and the long pipe of the pipe, Coupling agent is also not feasible, so only by reducing the contact surface, through the contact surface of lX15 (mm) as shown in Figure 1, the strong pressing method is used, so that there is no air between the waveguide surface and the pipe to be tested. Ultrasonic energy can enter the pipeline to be tested through the interface without the coupling agent, and no air is involved.

[0008] 2) The use of the elongated waveguide strip method has many disadvantages. First, the ultrasonic transducer sounding interface is circular, and its emitting surface diameter is fixed. The optimal outer dimensions of the elongated waveguide strip are less than 1 times the wavelength (λ) and the width is greater than 5 times. The transmission speed of the ultrasonic transverse wave in the metal is C=3200 m/s, and the vibration frequency is F=2.5. For the calculation of MHz, the wavelength = C / F = 1.28mm, the smaller the thickness, the better the sound Wave fidelity does not occur. Calculating the elongate rectangular section with a thickness of 1 mm and a width of 15 mm in Fig. 1, the utilization of the emitted energy is only one tenth. Secondly, the elongate waveguide strip allows bending to be an advantage, and it is not possible to ensure a linear straight line in practical applications, so the ultrasonic wave must be reflected back and forth between the two sides of the elongated waveguide strip, each time reflecting With refraction, each reflection and refraction has energy attenuation, and the more the number of reflections, the more energy is attenuated. Third, the ultrasonic wave is reflected back and forth in the elongated waveguide strip, and the incident angle of the ultrasonic wave into the object to be measured cannot be guaranteed. Although the angle is small, it also causes the receiving position and angle of the waveguide receiving the reflected wave. The effect is that the fixed acceptance angle is not optimal.

[0009] The present invention is directed to the shortcomings of the prior art mentioned above, the arc surface acoustic wave waveguide device can fully utilize the energy of the transducer, can ensure the incident angle, and the sound wave is reflected and refracted at most once in the waveguide to reduce energy attenuation. It also reduces the predisposing factors that cause waveform dispersion or distortion.

Problem solution

Technical solution

[0010] As shown in FIG. 3, a metal waveguide strip having a rectangular cross-sectional shape is used, and the waveguide strip is bent from the B-section to the G-plane, and all the curved surfaces are collectively referred to as the H-plane, and the C-section 吋H-plane The distance from the G surface is 1 mm 吋 stop. The detailed surface curvature of the H-plane is obtained by sound ray tracing, ensuring that all sound waves perpendicularly downward from the B-section are incident on the H-plane, and are reflected by the geometric law of the acoustic wave, and are reflected to the cross-sectional size of 1 X l5 (mm). ) on the section C. Regardless of how the H-face is bent, it is always perpendicular to the M-face and the N-face.

[0011] The ultrasonic wave emitted by the transducer is a polarized transverse wave, and the vibration direction vibrates perpendicular to the paper surface in the main view, that is, the vibration direction is parallel to the H surface and the G surface. The size of the rectangular section A is adapted to the circular surface of the transducer. In order to maximize the contact area between the incident surface of the waveguide and the circular surface of the transducer, a square section inscribed with the circular surface of the transducer can also be formed. However, it is not possible to use a cylindrical section that fully covers the circular surface of the transducer. If the largest Φ18 cylindrical waveguide is used, the ultrasonic waves will be scattered and distorted.

[0012] The ultrasonic wave transmitted vertically downward from the B section, except for the sound line within 1 mm of the G surface, does not undergo the third reflection, directly hits the section C, and the remaining ultrasonic waves are vertically downwardly projected onto the curved surface H. The specific curvature of the H-plane is obtained by the sound ray tracking, and all the sound waves that are perpendicularly directed from the B section to the H-surface are reflected by the H-plane once to the section C.

[0013] On the basis of satisfying the above reflection requirements, the distance between the A section and the B section and the B section to the C section The distance between the two can be adjusted according to the strength of the signal and the allowable temperature of the high temperature environment. Not only the heat transferred from the heat source of the measured object to the A section is suitable for long-term effective operation of the transducer, but also suitable for on-site installation. The larger the ratio of the vertical distance between the B section to the C section and the difference between the thickness side length of the B section and the thickness side length of the C section, the smaller the stroke difference between the sound rays, and the better the measurement effect.

[0014] The above is a transmitting waveguide. On the basis of satisfying the above principle of the arcuate waveguide, the receiving waveguide and the transmitting waveguide can be identically symmetrical or different according to the similar shape, depending on the installation. The actual requirements are adjusted accordingly, and the thickness directions of the A and B sections can also be appropriately reduced. The acoustic waves of all angles emanating from the cross section of the transmitting waveguide C can enter the C section of the receiving waveguide at a symmetrical angle and return as the original route until the transducer is received for reception.

[0015] The pair of waveguides are composed of the transmitting waveguide and the receiving waveguide, and the span a between the two waveguides cannot be zero, and the suitable distance can be adjusted according to the thickness of the tested sample block, so that the tested sample block is always thinned to the allowable Within the minimum wall thickness range, the transducers for reception are capable of receiving the most suitable reflected signal. The transmitted ultrasonic wave enters the object to be measured through the C section, and is reflected on the inner wall of the object to be measured. The non-ideal plane caused by corrosion or the like causes dispersion of the reflected sound wave. This structure forms a wide angle of reception, so that it can be reflected from vertical to It is also one of the advantages of the present invention that a certain angle of reflected sound rays can simultaneously arrive at the transducer for reception.

[0016] A curved surface acoustic wave waveguide device in the field of ultrasonic thickness measurement, in the case of ensuring that the ultrasonic wave does not have dispersion and fidelity, the circular contact surface with the transducer is a wide surface, which can be used for maximum Receiving the energy of the transducer, and transmitting all of the received energy to an elongated rectangular narrow surface by means of arcuate focusing during conduction, not only dissipating the received ultrasonic energy, but also the entire ultrasonic wave At most one reflection during the conduction stroke, the energy attenuation is effectively reduced, and the predisposing factors for the dispersion or distortion of the ultrasonic wave are also reduced, and it is also suitable for connection with a curved measuring surface such as a pipe. The wide-section waveguide receives large ultrasonic energy and is not suitable for contact with the measured surface; the narrow-surface waveguide receives small ultrasonic energy, but is suitable for connection with the measured surface; the invention realizes that the ultrasonic wave is removed without receiving energy The wide surface is transmitted to the narrow surface and then from the narrow surface to the wide surface, solving a practical problem in the field of ultrasonic thickness measurement.

[0017]

Advantageous effects of the invention

Beneficial effect 1. The present invention increases the contact area with the transducer to ensure maximum utilization of ultrasonic energy in the absence of dispersion and torsion of the transversely polarized waves. The contact surface of the invention with the object to be tested is a narrow rectangular section, which is suitable for the measurement of curved surfaces such as petrochemical pipes.

[0019] 2. The curved surface design prevents the received ultrasonic waves from being lost, so that all the received ultrasonic waves can be utilized to the utmost extent.

[0020] 3. The waveguide device removes at most one reflection from the ultrasonic wave to the ultrasonic wave, which not only reduces the attenuation of energy, but also reduces the induced factors causing ultrasonic dispersion and distortion.

[0021] 4. The present invention enables the incident angle of the ultrasonic wave to enter the object to be measured to be substantially fixed, which is suitable for the surface measurement and the signal is stable, and can receive the reflected ultrasonic wave at a wide angle.

[0022] 5. The invention solves the problem that the entanglement agent is not suitable for the long-turn monitoring of the high-temperature pipeline and the high temperature resistance of the transducer

[0023]

Brief description of the drawing

DRAWINGS

[0024] FIG. 1 is a front elevational view of an application schematic of a prior art elongated waveguide strip.

[0025] FIG. 2: Schematic diagram of the connection of the curved object to the waveguide.

3 is a front view of a schematic view of a curved acoustic waveguide of the present invention.

[0027] FIG. 4: Schematic diagram of an extended application of the present invention.

[0028] FIG. 5 is a perspective view of a schematic view of a mounting of a curved acoustic waveguide.

[0029] FIG. 6 is a side view of an application schematic of a prior art elongated waveguide strip.

7 is a side view of a schematic view of a curved acoustic waveguide of the present invention.

8 is a cross-sectional view of A in FIG. 3.

9 is a cross-sectional view taken along line B-B of FIG. 3.

[0033] wherein, the transmitting waveguide 1, the receiving waveguide 2, the rectangular portion 3, the curved surface portion 4, the transducer 5, the pipe 6 to be tested, and the expanded portion 7.

[0034] In addition, in the figure, U is a thickness and V is a width.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION BEST MODE FOR CARRYING OUT THE INVENTION

[0036] FIG. 3 is one of the examples in accordance with the present invention. Actually, a curved surface acoustic waveguide device is used, which is divided into two parts, a transmitting waveguide 1, and a receiving waveguide 2. Between the A section and the B section is a regular strip having a rectangular cross section, and all the cross-sectional shapes parallel to the A section are the same as the A and B sections. The size of the A section is adapted to the size of the circular surface of the transducer 5, and in order to maximize the circular contact area of the waveguide entrance surface with the transducer 5, a square section inscribed with the circular surface of the transducer 5 may also be formed. The transducer 5 has a circular diameter of Φ18 and a rectangular cross section of 12X15 (mm).

[0037] The H-face is a curved surface which is bent from the B-section to the G-plane until the C-section 吋 is bent to a distance of 1 mm from the G-plane. The specific curvature of the H-plane is obtained by ray-tracking, ensuring that the sound rays that are transmitted vertically downward from the A-section are arranged from left to right, and all the ultrasonic waves that are perpendicularly directed onto the H-plane are reflected once onto the C-section.

[0038] Thus, the ultrasonic wave is vertically and downwardly guided from the A section into the waveguide, and the other sound rays are all incident on the H plane except for the sound rays in the region near the G surface, and are reflected by the H plane to the C section. The sound line in the l mm area near the G surface is directly reflected on the C section without reflection. The outer dimension of the C section is lX15 (mm), and the thickness of the C section is the smallest, ensuring that the C section can be in effective contact with the pipe to be tested 6 under appropriate pressure.

[0039] According to the thickness side length of the rectangular section B, the distance between the B section and the C section is determined, so that the distance between the two sides of the 8 and C is larger, so that the stroke differences of all the acoustic waves between the two sides are approximately equal. The ultrasonic signal received by the transducer 5 for reception can be effectively read. On this basis, according to the strength of the signal and the allowable degree of the high temperature environment in the field, the distance between the A and B sections is adjusted, so that the heat from the heat source of the measured object to the A section is suitable for the long-term effective operation of the transducer 5, and is also suitable for consideration. On-site installation.

[0040] The transmitting waveguide 1 and the receiving waveguide 2 form a pair of waveguides, and the span a between the two waveguides cannot be zero, and the suitable distance can be adjusted according to the thickness of the sample to be tested, so as to ensure that the sample to be tested is continuously thinned to Within the minimum allowable wall thickness range, the transducer 5 for receiving can receive the most suitable reflected signal.

[0041]

Embodiments of the invention

[0042] In order to make the technical problems, technical solutions, and advantageous effects of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the descriptions described herein The embodiments are merely illustrative of the invention and are not intended to limit the invention.

[0043] A curved surface acoustic wave waveguide device suitable for use in the field of ultrasonic thickness measurement, as shown in FIG. 3, includes a transmitting waveguide 1 and a receiving waveguide 2; the transmitting waveguide 1 and the receiving waveguide 2 form a pair of waveguides, a span a>0 between the transmitting waveguide 1 and the receiving waveguide 2 _; the transmitting waveguide 1 and the receiving waveguide 2 each include a rectangular portion 3 and a curved portion 4 connected up and down;

[0044] The upper surface of the rectangular portion 3 is A cross section, the connecting surface between the rectangular portion 3 and the curved surface portion 4 is a B cross section, and the lower surface of the curved surface portion 4 is a C cross section; The A section and the B section are both rectangular sections; the C section is a rectangular section; the rectangular section 3 is a regular strip having a rectangular cross section between the A section and the B section, and is parallel thereto. All cross-sectional shapes and dimensions of the A section and the B section are the same as the A section and the B section;

[0045] The curved surface portion 4 further includes an H surface, a G surface, an M surface, and an N surface; and the upper ends of the H surface, the G surface, the M surface, and the N surface are connected to the B a cross section, the lower end of the H face, the G face, the M face, and the N face are connected to the C section; the G face is a plane, the G face is perpendicular to the A section and the a B section; the M face and the N face are also perpendicular to the A face and the B face;

[0046] the H-face is a curved surface, which is bent from the B-section to the G-plane until the C-section; the H faces the G-plane bending process, each of which is opposite to the B The line segments on the G face in parallel with the parallel faces are parallel to the line segments on the H face; the curvature of the H faces ensures that all ultrasonic waves from the A section are perpendicularly incident on the H face Reflected once onto the C section.

[0047] In a more preferred embodiment, the H planes are two, respectively located on two sides of the G plane, and the G plane is a virtual plane.

[0048] In a more preferred embodiment, the two H-planes are symmetrically disposed on both sides of the G-face.

[0049] In a more preferred embodiment, the M-face and/or the N-face are provided with extensions of various shapes along the widthwise sides.

[0050] In a more preferred embodiment, the H-plane is curved from the B-section to the G-plane, and the C-section 吋 is bent to a distance from the G-plane of less than 2.5λ.

[0051] In a more preferred embodiment, the meandering surface is curved from the Β section to the G surface, and the C section 吋 is curved to a distance of 0.5λ-1λ from the G surface.

[0052] In a more preferred embodiment, the size of the cross section of the crucible is adapted to the size of the circular face of the transducer 5. [0053] In a more preferred embodiment, the curvature of the H-face is obtained by acoustic tracking.

[0054] In a more preferred embodiment, sound waves are emitted from the C-section of the transmitting waveguide 1 at an angle that can enter the C-section of the receiving waveguide 2 from a symmetrical angle, and can be pressed The same form of route as the original incident path returns until the transducer 5 for reception is entered.

[0055] In a more preferred embodiment, the distance between the A section and the B section is adjusted according to the signal strength and the allowable degree of the high temperature environment in the field, so that the heat transferred from the heat source of the object to the A section is suitable for the replacement. The energy device 5 works effectively for a long time and is suitable for field installation; the specific dimensions of the receiving waveguide 2 and the transmitting waveguide 1 may be identical or different, and may be adjusted according to actual requirements of the installation.

[0056] In a more preferred embodiment, the span a between the transmitting waveguide 1 and the receiving waveguide 2 is adjusted according to the thickness of the sample to be tested, and the sample to be tested is always thinned to the minimum allowable wall thickness. Within the scope, the transducers 5 for receiving are all capable of receiving the most suitable reflected signal.

[0057] In a more preferred embodiment, the transmitting waveguide 1 and the receiving waveguide 2 are pressed onto the pipe 6 to be tested by means of a clamp such that the section C is directly directly connected to the outer wall of the pipe 6 to be tested. Contact and compaction, allowing sound waves to be transmitted between the C section and the outer wall of the pipe without the use of a couplant.

[0058] In a more preferred embodiment, the transmitting waveguide 1 and / or the receiving waveguide 2 further comprises an extended section 7;

The lower section of the expansion section 7 expands upward from the A section, and extends to the section of the upper section D after the second bending; the section shape of the extension section 7 is the same as the section A, and is still a rule. The expansion section 7 further includes a slope E plane and a slope plane F which are parallel to each other; in the extension section 7, sound waves are incident on the E plane from the D section into the waveguide, through the E The surface is reflected to the F surface, and after being reflected by the F surface, it becomes vertically downward into the A section; and after all the sound waves incident from the D section are subjected to secondary reflection, all the sound lines are just translated. To the B section, and all of the sound path travels from the D section to the A section are equal.

[0059] In a more preferred embodiment, the angle B between the E face and the F face and the G face is greater than 0 degrees and less than 60 degrees. Industrial Applicability

[0060] The present invention achieves a practical problem in the field of ultrasonic thickness measurement by transmitting ultrasonic waves from a wide surface to a narrow surface and then from a narrow surface to a wide surface without loss of received energy.

[0061] The invention can permanently fix the ultrasonic probe to the outer surface of the pipeline and become an on-line fixed-point thickness measurement. In practical applications, especially in petroleum refining and chemical enterprises, many harsh operating environments such as high temperature and high altitude can be used.

Claims

Claim

[Claim 1] A curved surface acoustic wave waveguide device suitable for use in the field of ultrasonic thickness measurement, comprising: a transmitting waveguide and a receiving waveguide, the transmitting waveguide and the receiving waveguide composing a pair of waveguides, the transmitting waveguide And a span a>0 between the receiving waveguide, the transmitting waveguide and the receiving waveguide each include a rectangular portion and a curved portion connected up and down, the upper surface of the rectangular portion is an A section, and the rectangular portion is a connecting surface between the curved surface portions is a B cross section, a lower surface of the curved surface portion is a C cross section, and the A cross section and the B cross section are both rectangular cross sections; the C cross section is a rectangular cross section, The rectangular portion is a regular strip having a rectangular cross-sectional shape between the A section and the B section, and all cross-sectional shapes and sizes parallel to the A section and the B section are the same as the A section and the The B-section is the same, the curved surface portion further includes an H-plane, a G-plane, an M-plane, and an N-face, and the upper ends of the H-face, the G-plane, the M-face, and the N-face are connected to the B section, the H The G-plane, the M-plane, and the lower end of the N-face are connected to the C-section, the G-plane is a plane, and the G-plane is perpendicular to the A-section and the B-section, the M The face and the N face are also perpendicular to the A face and the B face, and the H face is a curved face that curves from the B section to the G face until the C section, the H Facing the G-plane bending process, in each of the paraboloids parallel to the B-section, its line segment on the G-plane is parallel to the line segment on the H-plane, and the curvature of the H-plane is guaranteed from All of the ultrasonic waves of the A section that are vertically downwardly incident on the H surface are reflected to the C section at one time.

[Claim 2] The arc surface acoustic wave waveguide device applicable to the field of ultrasonic thickness measurement according to claim 1, wherein: the H surface is two, respectively located on both sides of the G surface, The G plane is a virtual plane.

[Claim 3] The arc-shaped acoustic waveguide device for use in the field of ultrasonic thickness measurement according to claim 2, wherein: the two H-planes are symmetrically disposed on both sides of the G-plane.

[Claim 4] The arc surface acoustic wave waveguide device applicable to the field of ultrasonic thickness measurement according to claim 1, wherein: the M surface and/or the N surface are provided along various sides of the width direction The extension of the shape.

[Claim 5] The arc surface acoustic wave waveguide device suitable for ultrasonic thickness measurement according to claim 1. The H-plane is curved from the B-section to the G-plane, and the C-section 吋 is bent to a distance from the G-plane of less than 2.5λ.

A curved surface acoustic wave waveguide device suitable for use in the field of ultrasonic thickness measurement according to claim 5, wherein: said kneading surface is bent from said Β section to said G surface, and said C section is bent to The distance from the G face is 0.5λ-1λ.

A curved acoustic wave waveguide device suitable for use in the field of ultrasonic thickness measurement according to claim 1, wherein: the size of the cross section of the crucible is adapted to the size of the circular surface of the transducer. The arc surface acoustic wave waveguide device for use in the field of ultrasonic thickness measurement according to claim 1, wherein: the curvature of the H surface is obtained by sound line tracking.

The arc surface acoustic wave waveguide device for use in the field of ultrasonic thickness measurement according to claim 1, wherein: the sound wave is emitted from the C section of the emission waveguide at an angle, and the reception can be entered from a symmetrical angle. The C-section of the waveguide, and both can be returned in the same form as the original incident path until the transducer is received for reception.

The arc surface acoustic wave waveguide device applicable to the field of ultrasonic thickness measurement according to claim 1, wherein: the distance between the A section and the B section is adjusted according to the signal strength and the allowable degree of the high temperature environment in the field, so that The heat transferred from the heat source of the test object to the A section is suitable for long-term effective operation of the transducer, and is suitable for field installation. The specific dimensions of the receiving waveguide and the transmitting waveguide may be identical or different, depending on the actual installation. Request to make the appropriate adjustments.

The arc surface acoustic wave waveguide device for use in the field of ultrasonic thickness measurement according to claim 1, wherein: a span a between the transmitting waveguide and the receiving waveguide is adjusted according to a thickness of the sample to be tested, and is guaranteed to be The sample block is thinned all the way to the minimum allowable wall thickness, and the transducer for receiving receives the most suitable reflected signal.

A curved surface acoustic wave waveguide device suitable for use in the field of ultrasonic thickness measurement according to claim 1, wherein: said transmitting waveguide and said receiving waveguide are pressed against a pipe to be tested by a fixture to cause said section C Directly contacting and compacting directly with the outer wall of the pipe to be tested, and transmitting acoustic waves between the C section and the outer wall of the pipe without using a coupling agent. a waveguide device, characterized in that: the transmitting waveguide and/or the receiving waveguide further comprise an expansion section, the lower section of the expansion section is extended upward from the A section, and extends to the upper portion after the second bending a section D of the section; the section shape of the extension section is the same as the section A, and is still a regular strip, and the extension section further includes a slope plane E plane and a slope plane F parallel to each other; in the extension section, the sound wave is The D section enters the waveguide and then strikes the E plane, and is reflected by the E plane to the F plane, and after being reflected by the F plane, becomes vertically downward into the A section, and is guaranteed to be After all the sound waves incident on the D section are subjected to secondary reflection, all the sound rays are just translated onto the B section, and all the sound ray strokes from the D section to the A section are equal.

[Claim 14] The arc surface acoustic wave device for use in the field of ultrasonic thickness measurement according to claim 15, wherein:

The angle B between the E face and the F face and the G face is greater than 0 degrees and less than 60 degrees.