CN215005129U - Laser ultrasonic detection device - Google Patents
Laser ultrasonic detection device Download PDFInfo
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- CN215005129U CN215005129U CN202120903502.0U CN202120903502U CN215005129U CN 215005129 U CN215005129 U CN 215005129U CN 202120903502 U CN202120903502 U CN 202120903502U CN 215005129 U CN215005129 U CN 215005129U
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Abstract
The utility model provides a laser ultrasonic testing device, include: the ultrasonic sensor comprises a laser, a convex lens, a first ultrasonic sensor, a second ultrasonic sensor and an oscilloscope; the incident end of the convex lens is opposite to the emitting end of the laser, and the emergent end of the convex lens is opposite to the workpiece to be measured; the first ultrasonic sensor and the second ultrasonic sensor are both connected with the oscilloscope; the first ultrasonic sensor and the second ultrasonic sensor are arranged on the workpiece to be measured. The utility model provides a laser ultrasonic testing device, first ultrasonic sensor are fixed in the one end on the surface of the work piece that awaits measuring, and second ultrasonic sensor removes along the surface of the work piece that awaits measuring, and based on the supersound echo signal that first ultrasonic sensor and second ultrasonic sensor detected, confirm the defective position, the defective position size and the defective position degree of depth of the work piece that awaits measuring, this laser ultrasonic testing device simple structure, the cost is lower, easy and simple to handle.
Description
Technical Field
The utility model relates to an ultrasonic inspection technical field especially relates to a laser ultrasonic detection device.
Background
The laser ultrasonic detection technology is a new cross discipline, integrates the disciplines of thermal, optical, acoustics, materials and the like, is widely applied to the fields of precision machinery, aerospace and the like at present, and utilizes laser pulses to excite ultrasonic waves in a detected workpiece and utilizes laser beams to detect the propagation of the ultrasonic waves so as to obtain workpiece information, such as workpiece thickness, internal and surface defects, material parameters and the like.
The laser ultrasonic detection system generally comprises a transmitting system and a receiving system, wherein the receiving system receives ultrasonic signals mainly through a photoelectric detector, for example, an extrapolation interferometer, a confocal F-P interferometer, a phase conjugate interferometer, a two-wave hybrid interferometer, a photo-induced electromotive force interferometer and the like.
The signal received by the photodetector is very weak and often mixed with other noise, so to obtain such weak signal, it is first preprocessed, the noise is filtered, and the signal is amplified and then studied. The signal processing part mainly comprises a photoelectric converter, a pre-amplification circuit, a filter and a main amplification circuit. Therefore, the existing laser ultrasonic detection system has complex structure, high cost and complex operation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a laser ultrasonic testing device for solve among the prior art laser testing device structure complicated, defect with high costs, the operation is complicated.
The utility model provides a laser ultrasonic testing device, include: the ultrasonic sensor comprises a laser, a convex lens, a first ultrasonic sensor, a second ultrasonic sensor and an oscilloscope;
the incident end of the convex lens is opposite to the emitting end of the laser, and the emergent end of the convex lens is opposite to the workpiece to be measured;
the first ultrasonic sensor and the second ultrasonic sensor are both connected with the oscilloscope; the first ultrasonic sensor and the second ultrasonic sensor are arranged on the workpiece to be measured.
According to the laser ultrasonic detection device provided by the utility model, the convex lens is a plano-convex lens;
the convex surface of the plano-convex lens is opposite to the transmitting end of the laser, and the plane of the plano-convex lens is opposite to the workpiece to be measured.
According to the utility model provides a laser ultrasonic detection device, the laser ultrasonic detection device also comprises a plano-concave lens;
the concave surface of the plano-concave lens is opposite to the transmitting end of the laser, the plane of the plano-concave lens is opposite to the convex surface of the plano-convex lens, and the optical axis of the plano-concave lens is coincided with the optical axis of the plano-convex lens.
According to the laser ultrasonic detection device provided by the utility model, the focal length of the plano-convex lens is 100-200 mm, and the diameter of the plano-convex lens is 30-60 mm; the focal length of the plano-concave lens is 30-60 mm, and the diameter of the plano-concave lens is 20-40 mm.
According to the utility model provides a pair of laser ultrasonic testing device first ultrasonic sensor with second ultrasonic sensor with under the condition that the work piece that awaits measuring contacted, first ultrasonic sensor or at least one of second ultrasonic sensor with be equipped with the couplant between the work piece that awaits measuring.
According to the utility model provides a pair of laser ultrasonic testing device, the couplant is machine oil or lubricating oil.
According to the utility model provides a pair of laser ultrasonic testing device, the couplant is under the condition of machine oil, the reference numeral of machine oil is No. 20 ~ 40.
According to the utility model provides a pair of laser ultrasonic testing device, the wavelength of the laser beam that the laser instrument produced is 900 ~ 1700nm, the energy size of laser beam is 50 ~ 200 mJ.
According to the utility model provides a pair of laser ultrasonic testing device, first ultrasonic sensor or at least one of second ultrasonic sensor is piezoelectric ultrasonic transducer.
According to the utility model provides a pair of laser ultrasonic testing device the laser beam directive that the laser instrument produced under the condition of work piece that awaits measuring, the laser beam of laser instrument with the surface vertical of work piece that awaits measuring.
The utility model provides a laser ultrasonic testing device, the laser beam of laser instrument transmission becomes the surface of parallel light directive work piece that awaits measuring behind the convex lens, first ultrasonic sensor is fixed in the one end on the surface of the work piece that awaits measuring, second ultrasonic sensor moves along the surface of the work piece that awaits measuring, the supersound echo signal that ultrasonic echo signal that first ultrasonic sensor detected and second ultrasonic sensor detected passes through the oscillogram and shows on oscilloscope, through the analysis to the oscillogram on the oscilloscope, can obtain the defective position of the work piece that awaits measuring, defect size and defect depth. The laser ultrasonic detection device is simple in structure, low in cost, simple and convenient to operate, and detection can be completed only by moving the second ultrasonic sensor in the detection process.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is one of schematic structural diagrams of a laser ultrasonic detection apparatus provided by the present invention;
fig. 2 is a second schematic structural diagram of the laser ultrasonic detection apparatus provided by the present invention;
reference numerals:
1: a laser; 2: a convex lens; 3: a first ultrasonic sensor;
4: a second ultrasonic sensor; 5: a workpiece to be tested; 6: a coupling agent;
7: an oscilloscope.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the drawings of the present invention are combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The laser ultrasonic testing apparatus of the present invention will be described with reference to fig. 1 to 2.
As shown in fig. 1, the laser ultrasonic testing apparatus of the embodiment of the present invention includes: the ultrasonic sensor comprises a laser 1, a convex lens 2, a first ultrasonic sensor 3, a second ultrasonic sensor 4 and an oscilloscope 7;
the incident end of the convex lens 2 is opposite to the emitting end of the laser 1, and the emergent end of the convex lens 2 is opposite to the workpiece 5 to be measured;
the first ultrasonic sensor 3 and the second ultrasonic sensor 4 are both connected with an oscilloscope 7; the first ultrasonic sensor 3 and the second ultrasonic sensor 4 are arranged on the workpiece 5 to be measured.
The incident end of the convex lens 2 is arranged in front of a probe of the laser 1 for emitting laser beams, and the emergent end of the convex lens 2 is opposite to the workpiece 5 to be measured, so that the laser beams emitted by the laser 1 are projected onto the workpiece 5 to be measured through the convex lens 2. The convex lens 2 is used to change the point light source emitted by the laser 1 into a line light source.
The laser beam emitted by the laser 1 is changed into parallel light rays to be emitted after passing through the convex lens 2, and the parallel light rays are projected onto the surface of the workpiece 5 to be measured, and the convex lens 2 rotates by a corresponding angle in response to the laser beam emitted by the laser 1 or the change of the position of the workpiece 5 to be measured, so that the laser beam refracted by the convex lens 2 is accurately projected onto the surface of the workpiece 5 to be measured.
The workpiece 5 to be measured is a metal piece, the laser 1 emits pulse laser, the laser beam is projected onto the surface of the workpiece 5 to be measured, and the workpiece 5 to be measured generates instantaneous and violent thermal expansion based on a thermoelastic effect, so that thermal excitation ultrasonic waves are generated and are propagated to the inside of the workpiece 5 to be measured along the surface of the workpiece 5 to be measured. When the thermally excited ultrasonic wave passes through the defect inside the workpiece 5 to be measured, the waveform of the thermally excited ultrasonic wave is abnormally changed to generate an ultrasonic echo signal.
The method comprises the steps of placing a first ultrasonic sensor 3 and a second ultrasonic sensor 4 on the surface of a workpiece 5 to be detected, wherein the first ultrasonic sensor 3 and the second ultrasonic sensor 4 are used for detecting ultrasonic echo signals generated by the workpiece 5 to be detected, the ultrasonic echo signals detected by the first ultrasonic sensor 3 are called first ultrasonic echo signals, and the ultrasonic echo signals detected by the second ultrasonic sensor 4 are called second ultrasonic echo signals.
The first ultrasonic sensor 3 and the second ultrasonic sensor 4 are both connected with an oscilloscope 7, the oscilloscope 7 is a dual-trace oscilloscope 7, and the dual-trace oscilloscope 7 is additionally provided with a special electronic switch on the basis of the single-line oscilloscope 7 to realize the respective display of two waveforms. The waveform diagram of the first ultrasonic echo signal displayed on the dual trace oscilloscope 7 is called a first waveform diagram, and the waveform diagram of the second ultrasonic echo signal displayed on the dual trace oscilloscope 7 is called a second waveform diagram.
When the workpiece 5 to be detected is detected, the first ultrasonic sensor 3 is fixed at one end of the surface of the workpiece 5 to be detected, and the first ultrasonic echo signal received by the first ultrasonic sensor 3 is stable, so that the first oscillogram is a stable oscillogram. The second ultrasonic sensor 4 moves from the position in contact with the first ultrasonic sensor 3 toward the other end of the workpiece 5 to be measured along the surface of the workpiece 5 to be measured. The second ultrasonic sensor 4 moves along the surface of the workpiece 5 to be measured, and when the surface or the inside of the workpiece 5 to be measured has a defect, the second ultrasonic echo signal received by the second ultrasonic sensor 4 is changed, so that the second waveform diagram is a changed waveform diagram.
In the process of moving the second ultrasonic sensor 4, when the difference between the first ultrasonic echo signal detected by the first ultrasonic sensor 3 and the second ultrasonic echo signal detected by the second ultrasonic sensor 4 is large, the second oscillogram can be seen to have an obvious wave peak through observing the first oscillogram and the second oscillogram on the oscilloscope 7, at the moment, the second ultrasonic sensor 4 is shown to move to the position of the defect, and thus the position of the defect of the workpiece 5 to be detected can be judged.
And continuing to move the second ultrasonic sensor 4 until the second ultrasonic echo signal detected by the second ultrasonic sensor 4 is basically consistent with the first ultrasonic echo signal detected by the first ultrasonic sensor 3, observing the first oscillogram and the second oscillogram to see that the second oscillogram is consistent with the waveform of the first oscillogram, indicating that the second ultrasonic sensor 4 has moved past the defect position on the workpiece 5 to be detected, wherein the distance between the second ultrasonic sensor 4 moving to the defect position and the second ultrasonic sensor 4 moving to the defect position is the size of the defect size.
The depth of the defect can be judged from the intensity of the second ultrasonic echo signal detected by the second ultrasonic sensor 4 at the position of the defect. When the intensity of the second ultrasonic echo signal detected by the second ultrasonic sensor 4 at the defect position is strong, the longitudinal distance of the peak is seen to be high on the second oscillogram; when the intensity of the second ultrasonic echo signal detected by the second ultrasonic sensor 4 at the defect position is weaker, the longitudinal distance of the peak is seen to be lower on the second oscillogram, and the depth of the corresponding defect can be calculated through the longitudinal distance of the peak on the second oscillogram.
The embodiment of the utility model provides an in, the laser beam of laser instrument 1 transmission becomes parallel light directive workpiece 5's surface that awaits measuring behind convex lens 2, first ultrasonic sensor 3 is fixed in the one end on workpiece 5's surface that awaits measuring, second ultrasonic sensor 4 moves along workpiece 5's surface that awaits measuring, the first supersound echo signal that first ultrasonic sensor 3 detected and the second supersound echo signal that second ultrasonic sensor 4 detected pass through the oscillogram and show on oscilloscope 7, through the analysis to first oscillogram and second oscillogram on oscilloscope 7, can obtain workpiece 5's that awaits measuring defective position, defect size and defect depth. The laser ultrasonic detection device has the advantages of simple structure, lower cost and simple and convenient operation, and can complete detection only by moving the second ultrasonic sensor 4 in the detection process.
In an alternative embodiment, as shown in fig. 2, the convex lens 2 is a plano-convex lens 2, a convex surface of the plano-convex lens 2 is opposite to the emitting end of the laser 1, and a plane of the plano-convex lens 2 is opposite to the workpiece 5 to be measured.
Specifically, the convex surface of the planoconvex lens 2 is opposite to the probe of the laser 1 emitting the laser beam, and the plane of the planoconvex lens 2 is opposite to the surface of the workpiece 5 to be measured, so that the laser beam emitted by the laser 1 is projected onto the surface of the workpiece 5 to be measured through the planoconvex lens 2.
One side of the plano-convex lens 2 is a plane, the other side of the plano-convex lens 2 is an outer convex surface, compared with the common convex lens 2, the plano-convex lens 2 can well convert a point light source into parallel light, and the plano-convex lens 2 is common, does not need to be customized additionally, and is low in manufacturing cost.
The embodiment of the utility model provides an in, the laser beam of 1 transmission of laser instrument projects workpiece 5 that awaits measuring through plano-convex lens 2 on the surface, has improved the precision that detects.
In an alternative embodiment, the laser ultrasonic detection device further comprises a plano-concave lens; the concave surface of the plano-concave lens is opposite to the emitting end of the laser 1, the plane of the plano-concave lens is opposite to the convex surface of the plano-convex lens 2, and the optical axis of the plano-concave lens is coincident with the optical axis of the plano-convex lens 2.
Specifically, a laser speed-increasing light path formed by sequentially connecting a plano-concave lens and a plano-convex lens 2 in series is arranged between a probe of the laser 1 and a workpiece 5 to be measured. The concave surface of the plano-concave lens is opposite to a probe which emits laser beams on the laser 1, the plane of the plano-concave lens is opposite to the convex surface of the plano-convex lens 2, the axis of the plano-concave lens is superposed with the axis of the plano-convex lens 2, the plano-concave lens is positioned at the focus position of the plano-convex lens 2, and the plane of the plano-convex lens 2 is opposite to the surface of a workpiece 5 to be measured.
The plano-convex lens 2 and the plano-concave lens rotate by corresponding angles in response to the laser beam emitted by the laser 1 or the change of the position of the workpiece 5 to be measured, so that the laser beam is accurately projected onto the surface of the workpiece 5 to be measured.
The laser beam emitted by the laser 1 is projected onto the surface of the workpiece 5 to be detected after sequentially passing through the plano-concave lens and the plano-convex lens 2, so that the projection range of the laser beam on the workpiece 5 to be detected is enlarged, the single detection area of the workpiece 5 to be detected is effectively increased, and the workpiece 5 to be detected is rapidly detected.
The embodiment of the utility model provides an in, through set up plano-concave lens between laser instrument 1 and plano-convex lens 2, the laser beam of laser instrument 1 transmission is thrown to workpiece 5 that awaits measuring behind plano-concave lens and plano-convex lens 2 in proper order on the surface, has effectively increased single detection area, has improved detection speed.
In an alternative embodiment, the focal length of the planoconvex lens 2 is 100-200 mm, and the diameter of the planoconvex lens 2 is 30-60 mm; the focal length of the plano-concave lens is 30-60 mm, and the diameter of the plano-concave lens is 20-40 mm.
In one embodiment, the focal length of the plano-convex lens 2 is 150mm, and the diameter of the plano-convex lens 2 is 50 mm; the focal length of the plano-concave lens is 40mm and the diameter of the plano-concave lens is 25 mm.
In an alternative embodiment, in the case where the first ultrasonic sensor 3 and the second ultrasonic sensor 4 are in contact with the workpiece 5 to be measured, a coupling agent 6 is provided between at least one of the first ultrasonic sensor 3 or the second ultrasonic sensor 4 and the workpiece 5 to be measured.
The coupling agent 6 is applied to the surface of the first ultrasonic sensor 3 that contacts the workpiece 5 to be measured, and the coupling agent 6 is applied to the surface of the second ultrasonic sensor 4 that contacts the workpiece 5 to be measured. In the use process, the first ultrasonic sensor 3 is fixed at one end of the surface of the workpiece 5 to be measured, and the second ultrasonic sensor 4 moves along the surface of the workpiece 5 to be measured from the position contacting with the first ultrasonic sensor 3 to the other end of the workpiece 5 to be measured.
In the detection process, the couplant 6 always exists at the contact part of the first ultrasonic sensor 3 and the second ultrasonic sensor 4 and the surface of the workpiece 5 to be detected, and the couplant 6 removes air between the first ultrasonic sensor 3 and the surface of the workpiece 5 to be detected and air between the second ultrasonic sensor 4 and the surface of the workpiece 5 to be detected, so that the interference of the air is reduced, a first ultrasonic echo signal detected by the first ultrasonic sensor 3 and a second ultrasonic echo signal detected by the second ultrasonic sensor 4 are more accurate, and therefore, a first oscillogram and a second oscillogram on the oscilloscope 7 can more accurately reflect the position, the size and the depth of a defect on the workpiece 5 to be detected, and the accuracy of a detection result is improved.
The embodiment of the utility model provides an in, through the position coating couplant 6 that contacts at first ultrasonic sensor 3 and second ultrasonic sensor 4 and the surface of work piece 5 that awaits measuring, get rid of the air between the surface of first ultrasonic sensor 3 and second ultrasonic sensor 4 and the work piece 5 that awaits measuring, improve the detectivity of first ultrasonic sensor 3 and second ultrasonic sensor 4 to improve the degree of accuracy of testing result.
In alternative embodiments, the coupling agent 6 is engine oil or lubricating oil.
The couplant 6 is generally liquid or fluid, and has the function of filling up unevenness on the surface of the workpiece 5 to be detected, so that the probe can move and scan on the surface of the workpiece 5 to be detected conveniently, and air between the probe and the surface of the workpiece 5 to be detected is removed.
The couplant 6 is selected more, for example, engine oil can be used as the couplant 6, and the couplant 6 is generally used for ultrasonic detection of rough surfaces and machined parts, and is the most widely used couplant 6 because the engine oil is relatively cheap in price, convenient in source, free of corrosion to workpieces and harmless to operators.
The machine oil uses 20 ~ 40 machine oil more, and 20 ~ 40 machine oil is the liquid form, and is the easy mobility, because the machine oil of different numbers has different viscosity, and the number is bigger, and viscosity is higher, and its viscosity also has certain change when ambient temperature is different, so need combine the environment factor according to the measuring needs and specifically select the machine oil number.
The coupling agent 6 can also be lubricating oil, and the lubricating oil used herein refers to lubricating oil with high viscosity and poor fluidity such as compressor lubricating oil, steam engine lubricating oil, spindle oil, industrial vaseline, butter, lubricating grease, etc., and is suitable for workpieces with rough surfaces and for occasions of elevation detection or vertical detection (side detection).
The coupling agent 6 can also adopt glycerin, which is a coupling medium with good sound transmission effect and insensitivity to sound contact pressure, has the best grade of chemical analysis purity, and is suitable for the workpiece 5 to be measured with higher surface smoothness.
Among the choices of the coupling agent 6, engine oil and industrial vaseline are more commonly used. When a workpiece 5 to be detected is subjected to flaw detection, which kind of coupling medium is specifically selected as the couplant 6 needs to be considered according to various factors such as the material and the surface condition of the workpiece 5 to be detected on site, subsequent processing procedures and the like, for example, steel structures and pressure pipelines for large-scale detection can be subjected to flaw detection, engine oil can be directly selected as the couplant 6, and the couplant is cheap and antirust.
The embodiment of the utility model provides an in, through the position coating machine oil or the industry vaseline that contact at first ultrasonic sensor 3 and second ultrasonic sensor 4 and the surface of work piece 5 that awaits measuring, get rid of the air between the surface of first ultrasonic sensor 3 and second ultrasonic sensor 4 and the work piece 5 that awaits measuring, improve first ultrasonic sensor 3 and 4 detectivity of second ultrasonic sensor to improve the degree of accuracy of testing result.
In an alternative embodiment, the laser 1 generates a laser beam with a wavelength of 900-1700 nm and an energy of 50-200 mJ.
The laser beam emitted by the laser 1 is projected to the surface of the workpiece 5 to be measured sequentially through the plano-concave lens and the plano-convex lens 2, and the heat effect generated by the laser beam on the surface of the workpiece 5 to be measured can be divided into a thermoelastic effect and a thermal corrosion effect according to the difference of the energy of the laser beam projected to the surface of the workpiece 5 to be measured.
The energy of the laser beam is low, the surface of the workpiece 5 to be measured absorbs heat not exceeding its melting temperature, a short-time expansion process is generated, and the stress wave associated with this expansion is mostly in the elastic range, which is called the thermo-elastic effect. The energy of the laser beam is high, the surface temperature of the workpiece 5 to be measured is raised and exceeds the evaporation temperature, an ablation phenomenon is generated, the surface of the workpiece 5 to be measured is gasified, plasma is formed, and then a reaction force vertical to the surface acts on the surface to form an elastic wave source, wherein the mode is called a thermal etching effect.
The wavelength selection range of the laser beam generated by the laser 1 is 900-1700 nm, for example, the wavelength of the laser beam is 1064nm, and the energy of the laser beam is 50-200 mJ, so that the laser beam can generate a thermo-elastic effect on the surface of the workpiece 5 to be measured, and the damage to the workpiece 5 to be measured due to a thermal erosion effect is avoided.
The embodiment of the utility model provides an in, the wavelength of the laser beam that laser instrument 1 produced is 900 ~ 1700nm, and the energy size of laser beam is 50 ~ 200mJ, detects a flaw to workpiece 5 that awaits measuring based on the thermoelastic effect, realizes the nondestructive test to workpiece 5 that awaits measuring.
In an alternative embodiment, at least one of the first ultrasonic sensor 3 or the second ultrasonic sensor 4 is a piezoelectric ultrasonic transducer.
The piezoelectric ultrasonic transducer has the characteristics of small volume, light weight, wide working frequency band, high sensitivity, reliable work, wide measuring range and the like, so the piezoelectric ultrasonic transducer is widely applied to the measurement of various dynamic forces, mechanical impact and vibration, and the aspects of acoustics, medicine, mechanics, space navigation and the like.
The embodiment of the utility model provides an in, first ultrasonic sensor 3 and second ultrasonic sensor 4 are piezoelectric ultrasonic transducer, improve the degree of accuracy to the testing result of work piece 5 that awaits measuring.
In an alternative embodiment, the laser beam of the laser 1 is perpendicular to the surface of the workpiece 5 to be measured, in case the laser beam generated by the laser 1 is directed to the workpiece 5 to be measured.
Specifically, a plano-concave lens and a plano-convex lens 2 are arranged between a probe of a laser 1 and a workpiece 5 to be measured, a concave surface of the plano-concave lens is opposite to the probe which emits laser beams on the laser 1, a plane of the plano-concave lens is opposite to a convex surface of the plano-convex lens 2, an axis of the plano-concave lens is overlapped with an axis of the plano-convex lens 2, the plano-concave lens is located at a focal position of the plano-convex lens 2, and a plane of the plano-convex lens 2 is parallel to the surface of the workpiece 5 to be measured.
The laser beam emitted by the laser 1 passes through the plano-concave lens and the plano-convex lens 2 in sequence and then is vertically projected onto the surface of the workpiece 5 to be detected, so that the maximum projection range of the laser beam on the surface of the workpiece 5 to be detected is ensured, the single detection area is increased, and the workpiece 5 to be detected is rapidly detected.
The embodiment of the utility model provides an in, the laser beam that laser instrument 1 produced projects workpiece 5 that awaits measuring perpendicularly on the surface, ensures that the laser beam is the biggest at workpiece 5's that awaits measuring projection scope on the surface, and the increase is to workpiece 5's that awaits measuring single detection area, realizes the short-term test to workpiece 5 that awaits measuring.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A laser ultrasonic testing apparatus, comprising: the ultrasonic sensor comprises a laser, a convex lens, a first ultrasonic sensor, a second ultrasonic sensor and an oscilloscope;
the incident end of the convex lens is opposite to the emitting end of the laser, and the emergent end of the convex lens is opposite to the workpiece to be measured;
the first ultrasonic sensor and the second ultrasonic sensor are both connected with the oscilloscope; the first ultrasonic sensor and the second ultrasonic sensor are arranged on the workpiece to be measured.
2. The laser ultrasonic testing device according to claim 1, wherein said convex lens is a plano-convex lens;
the convex surface of the plano-convex lens is opposite to the transmitting end of the laser, and the plane of the plano-convex lens is opposite to the workpiece to be measured.
3. The laser ultrasonic inspection device of claim 2, further comprising a plano-concave lens;
the concave surface of the plano-concave lens is opposite to the transmitting end of the laser, the plane of the plano-concave lens is opposite to the convex surface of the plano-convex lens, and the optical axis of the plano-concave lens is coincided with the optical axis of the plano-convex lens.
4. The laser ultrasonic testing device according to claim 3, wherein the focal length of the plano-convex lens is 100-200 mm, and the diameter of the plano-convex lens is 30-60 mm; the focal length of the plano-concave lens is 30-60 mm, and the diameter of the plano-concave lens is 20-40 mm.
5. The laser ultrasonic inspection apparatus according to any one of claims 1 to 4, wherein a coupling agent is provided between at least one of the first ultrasonic sensor or the second ultrasonic sensor and the workpiece to be inspected in a state where the first ultrasonic sensor and the second ultrasonic sensor are in contact with the workpiece to be inspected.
6. The laser ultrasonic testing device of claim 5, wherein the coupling agent is engine oil or lubricating oil.
7. The laser ultrasonic testing device of claim 6, wherein when the couplant is engine oil, the engine oil is numbered 20-40.
8. The laser ultrasonic testing device according to any one of claims 1 to 4, wherein the laser generates a laser beam having a wavelength of 900 to 1700nm and an energy of 50 to 200 mJ.
9. The laser ultrasonic testing device according to any one of claims 1 to 4, wherein at least one of the first ultrasonic sensor or the second ultrasonic sensor is a piezoelectric ultrasonic transducer.
10. The laser ultrasonic inspection apparatus according to any one of claims 1 to 4, wherein the laser beam generated by the laser is perpendicular to the surface of the workpiece to be inspected in a state where the laser beam is directed to the workpiece to be inspected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120903502.0U CN215005129U (en) | 2021-04-28 | 2021-04-28 | Laser ultrasonic detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120903502.0U CN215005129U (en) | 2021-04-28 | 2021-04-28 | Laser ultrasonic detection device |
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| CN215005129U true CN215005129U (en) | 2021-12-03 |
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Granted publication date: 20211203 |