CN113640384A - Remote TOFD laser ultrasonic weld nondestructive testing equipment and method - Google Patents
Remote TOFD laser ultrasonic weld nondestructive testing equipment and method Download PDFInfo
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- CN113640384A CN113640384A CN202111188037.8A CN202111188037A CN113640384A CN 113640384 A CN113640384 A CN 113640384A CN 202111188037 A CN202111188037 A CN 202111188037A CN 113640384 A CN113640384 A CN 113640384A
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- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 8
- 230000007547 defect Effects 0.000 claims abstract description 18
- 238000003384 imaging method Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2431—Probes using other means for acoustic excitation, e.g. heat, microwaves, electron beams
Abstract
The invention relates to a remote TOFD laser ultrasonic weld nondestructive testing device, which comprises: the field lens is arranged at the emergent end of the first laser; the light splitting device is arranged at the emergent end of the second laser; the electric reflector is arranged at one emergent end of the light splitting device; the first reflector is arranged at one emergent end of the light splitting device; the imaging lens is arranged at the emergent end of the first reflector; the photoelectric detector is arranged at one emergent end of the light splitting device; the signal processing end is respectively and electrically connected with the first laser, the second laser and the photoelectric detector. The laser is used for exciting ultrasonic signals to replace the traditional piezoelectric probe to emit signals, the traditional piezoelectric probe can only emit ultrasonic waves in one mode, the laser can ultrasonically emit waves in various modes, various defect types can be detected, the sound wave diffusion surface is large, the signal detection is convenient, and the defect measurement precision is high.
Description
Technical Field
The invention relates to the technical field of nondestructive inspection, in particular to remote TOFD laser ultrasonic weld nondestructive inspection equipment and a method.
Background
Laser ultrasound is a non-contact, high-precision, non-destructive novel ultrasonic detection technology, which utilizes laser pulses to excite ultrasonic waves in a detected workpiece and uses signal detection equipment to detect the propagation of the ultrasonic waves, thereby acquiring workpiece information, such as workpiece thickness, internal and surface defects, material parameters and the like.
The purpose of weld seam detection is to ensure the integrity, reliability, safety and usability of the welded structure. The quality of the welding seam can be affected by the defects of cracks, slag inclusion and the like on the surface and inside of the welding seam, and the speed and the accuracy of the current welding seam detection are far from the requirements.
The traditional diffraction time difference method (TOFD) technology adopts a transmitting and receiving two broadband narrow pulse probes for detection, the probes are symmetrically arranged relative to the central line of a welding seam, a transmitting probe generates a non-focused longitudinal wave beam to be incident into a workpiece at a certain angle, part of the beam is transmitted along a near surface and received by a receiving probe, part of the beam is reflected by a bottom surface and received by the receiving probe, the receiving probe determines the position and the height of a defect by receiving a diffraction signal of the tip of the defect and time difference of the diffraction signal,
a single probe can only detect ultrasonic waves in a certain mode, and a couplant needs to be smeared, so that the efficiency and the defect detection accuracy are greatly reduced, and the conditions of missing detection and the like exist.
Disclosure of Invention
The invention aims to solve the technical problem of providing remote TOFD laser ultrasonic weld joint nondestructive testing equipment and a method thereof so as to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: a remote TOFD laser ultrasonic weld nondestructive testing apparatus comprising:
a field lens arranged at an exit end of the first laser;
a light splitting device arranged at the exit end of the second laser;
an electric reflector arranged at one emergent end of the light splitting device;
a first reflector arranged at one exit end of the light splitting device;
an imaging lens disposed at an exit end of the first reflector;
a photodetector disposed at one exit end of the light splitting device;
and the signal processing end is electrically connected with the first laser, the second laser and the photoelectric detector respectively.
On the basis of the technical scheme, the invention can be further improved as follows.
Further, still include: and a reflective mirror arranged between the exit end of the first laser and the entrance end of the field lens.
Further, the first laser employs a pulse laser.
Further, the first laser emits pulsed laser light with wavelength bands of 532nm and 1064 nm.
Further, the energy density of the pulse laser emitted by the first laser is more than 500uJ/cm2The average power is 1W-100W.
Further, the second laser adopts a low-power continuous laser.
Further, the power of the second laser is 50mW-300 mW.
Further, the second laser employs a He — Ne laser.
Further, the light splitting device is a light splitter.
A remote TOFD laser ultrasonic weld nondestructive testing method comprises the following steps:
s100, adjusting angles of a reflector and a field lens, starting a first laser to emit pulse laser, enabling the pulse laser to be emitted into the field lens through the reflector, and then focusing and field-fixing the pulse laser on a workpiece through the field lens to generate ultrasonic waves in various modes;
s200, starting a second laser to emit pulse laser, wherein the emitted pulse laser is divided into two beams by a light splitter;
one beam is reflected to the electric reflector, then reflected to the light splitting device and transmitted to the photoelectric detector, and the beam is a reference light path;
the other beam is transmitted to the first reflector, is reflected by the first reflector and is transmitted to the workpiece from the imaging lens, the vibration is caused by the ultrasonic, and the reflected light carries the ultrasonic information to be captured by the imaging lens, returns to the light splitting device and reaches the photoelectric detector through reflection;
two beams of return light interfere with each other, and the interference signal is demodulated to obtain a multi-mode ultrasonic signal;
s300, classifying the acquired ultrasonic signals in multiple modes by the signal processing end, separating the waves in different modes according to different wave propagation speeds of the different modes, imaging respectively, and acquiring various defect information at one time.
The invention has the beneficial effects that:
1) the laser is used for exciting ultrasonic signals to replace the traditional piezoelectric probe to emit signals, the traditional piezoelectric probe can only emit ultrasonic waves in one mode, the laser can ultrasonically emit waves in various modes, various defect types can be detected, the sound wave diffusion surface is large, the signal detection is convenient, and the defect measurement precision is high;
2) the scanning device can be matched, then the defect information is determined according to the time when the defect echo and the defect echo start to appear and the scanning speed, the defect length is determined according to the oblique incident wave signal, and the depth is judged according to the longitudinal wave signal;
3) can carry out remote non-contact detection;
4) laser excitation and laser receiving ultrasonic signals can realize real-time and rapid display of defect echo signals when being matched with a scanner.
Drawings
FIG. 1 is a light path diagram of the remote TOFD laser ultrasonic weld nondestructive testing apparatus according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a first laser, a field lens, a beam splitter, a second laser, a third laser, a fourth laser, a fifth laser, a sixth laser, a fourth laser, a fifth laser, a sixth laser, a fifth laser, a sixth laser, a fifth, a sixth laser, a sixth, a fifth laser, a sixth, a fifth, a sixth, a fifth, a sixth, a 7, a fifth, a imaging lens, a 7, a imaging lens, a fifth, a imaging lens, a 9, a photoelectric detector, a 9, a signal processing terminal, a photoelectric detector, a 10, a reflector.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, a remote TOFD laser ultrasonic weld nondestructive testing apparatus includes:
the system comprises a first laser 1, a field lens 2, a light splitting device 3, a second laser 4, an electric reflector 5, a first reflector 6, an imaging lens 7, a photoelectric detector 8 and a signal processing end 9;
the first laser 1 is used for emitting pulse laser;
the field lens 2 is arranged at the emergent end of the first laser 1, and pulse laser emitted by the first laser 1 can be incident into the field lens 2 and is focused by the field lens 2 to fix a field and then acts on a workpiece so as to generate ultrasonic waves in various modes;
the second laser 4 is used for emitting pulse laser;
the light splitting device 3 is arranged at the emergent end of the second laser 4 and is used for splitting the pulse laser emitted by the second laser 4 into two beams or combining the two beams into one beam;
the electric reflector 5 is arranged at one emergent end of the light splitting device 3, is used for reflecting the light beam emitted from the light splitting device 3 back to the light splitting device 3, and can move back and forth to adjust the optical path of the reference light path;
the first reflector 6 is arranged at one emergent end of the light splitting device 3 and used for reflecting the light beam emitted from the light splitting device 3 according to a preset light path;
the imaging lens 7 is arranged at the exit end of the first reflector 6, and the pulse laser reflected by the first reflector 6 enters the imaging lens 7;
the photodetector 8 is arranged at one emitting end of the light splitting device 3, and is used for acquiring an optical signal emitted from the light splitting device 3 and converting the optical signal into an electrical signal;
the signal output end of the signal processing end 9 is electrically connected with the signal input end of the first laser 1;
the signal output end of the signal processing end 9 is electrically connected with the signal input end of the second laser 4;
the signal input end of the signal processing end 9 is electrically connected with the signal output end of the photoelectric detector 8.
Example 2
As shown in fig. 1, this embodiment is further optimized based on embodiment 1, and it specifically includes the following steps:
the remote TOFD laser ultrasonic weld nondestructive testing equipment further comprises: and a mirror 10, the mirror 10 being disposed between the exit end of the first laser 1 and the entrance end of the field lens 2, for changing the optical path direction of the pulse laser light emitted from the first laser 1 toward the field lens 2.
Example 3
As shown in fig. 1, this embodiment is further optimized based on embodiment 1 or 2, and it is specifically as follows:
the first laser 1 adopts a pulse laser, the first laser 1 emits pulse laser with wave bands of 532nm and 1064nm, and the pulse laser with the wave bands can better generate ultrasonic signals with proper intensity on a workpiece.
Furthermore, the energy density of the pulse laser emitted by the first laser 1 is more than 500uJ/cm2The average power is 1W-100W.
Example 4
As shown in fig. 1, this embodiment is further optimized based on embodiment 1, 2 or 3, and it is specifically as follows:
the second laser 4 adopts a low-power continuous laser, and the power of the second laser 4 is 50mW-300 mW;
in general, the second laser 4 is preferably a He — Ne laser, but is not limited to such a laser.
Example 5
As shown in fig. 1, this embodiment is further optimized based on embodiments 1 or 2 or 3 or 4, and it is specifically as follows:
the spectroscopic device 3 is preferably a spectroscope.
Example 6
A remote TOFD laser ultrasonic weld nondestructive testing method comprises the following steps:
s100, adjusting angles of a reflector 10 and a field lens 2, starting a first laser 1 to emit pulse laser, enabling the pulse laser to be emitted into the field lens 2 through the reflector 10, and then focusing and fixing a field on a workpiece through the field lens 2 to generate ultrasonic waves in various modes;
s200, starting a second laser 4 to emit pulse laser, wherein the emitted pulse laser is divided into two beams by a light splitter 3;
one beam is reflected to the electric reflector 5 and then reflected back to the light splitting device 3 and transmitted to the photoelectric detector 8, which is a reference light path;
the other beam is transmitted to the first reflector 6, reflected by the first reflector 6 and transmitted to the workpiece from the imaging lens 7, and vibrated by the ultrasonic wave, and the reflected light carries the ultrasonic information, is captured by the imaging lens 7, returns to the light splitting device 3 and reaches the photoelectric detector 8 through reflection;
two beams of return light interfere with each other, and the interference signal is demodulated to obtain a multi-mode ultrasonic signal;
s300, the signal processing end 9 classifies the acquired ultrasonic signals in multiple modes, the waves in different modes are separated according to different wave propagation speeds of different modes, the waves are imaged respectively, and various defect information can be acquired at one time.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A remote TOFD laser ultrasonic weld nondestructive testing device is characterized by comprising:
a field lens (2) arranged at the exit end of the first laser (1);
a light splitting device (3) arranged at an exit end of the second laser (4);
an electric reflector (5) arranged at one exit end of the light-splitting device (3);
a first reflector (6) arranged at one exit end of the light splitting device (3);
an imaging lens (7) disposed at an exit end of the first mirror (6);
a photodetector (8) arranged at one exit end of the light splitting device (3);
and the signal processing terminal (9) is electrically connected with the first laser (1), the second laser (4) and the photoelectric detector (8) respectively.
2. The remote TOFD laser ultrasonic weld nondestructive testing apparatus of claim 1 further comprising:
a mirror (10) arranged between the exit end of the first laser (1) and the entrance end of the field lens (2).
3. The remote TOFD laser ultrasonic weld nondestructive testing apparatus of claim 1 wherein: the first laser (1) adopts a pulse laser.
4. The remote TOFD laser ultrasonic weld nondestructive testing apparatus of claim 3 wherein: the first laser (1) emits pulse laser with wave bands of 532nm and 1064 nm.
5. The remote TOFD laser ultrasonic weld nondestructive testing apparatus of claim 3 wherein: the energy density of the pulse laser emitted by the first laser (1) is more than 500uJ/cm2The average power is 1W-100W.
6. The remote TOFD laser ultrasonic weld nondestructive testing apparatus of claim 1 wherein: the second laser (4) adopts a low-power continuous laser.
7. The remote TOFD laser ultrasonic weld nondestructive testing apparatus of claim 6 wherein: the power of the second laser (4) is 50mW-300 mW.
8. The remote TOFD laser ultrasonic weld nondestructive testing apparatus of claim 7 wherein: the second laser (4) is a He-Ne laser.
9. The remote TOFD laser ultrasonic weld nondestructive testing apparatus of claim 1 wherein: the light splitting device (3) is a light splitting mirror.
10. A remote TOFD laser ultrasonic weld nondestructive testing method is characterized by comprising the following steps:
s100, adjusting angles of a reflector (10) and a field lens (2), starting a first laser (1) to emit pulse laser, enabling the pulse laser to be emitted into the field lens (2) through the reflector (10), and then focusing and fixing a field on a workpiece through the field lens (2) to generate ultrasonic waves in various modes;
s200, starting a second laser (4) to emit pulse laser, wherein the emitted pulse laser is divided into two beams by a light splitter (3);
one beam is reflected to the electric reflector (5), then reflected to the light splitting device (3) and transmitted to the photoelectric detector (8), and the beam is a reference light path;
the other beam is transmitted to the first reflector (6), reflected by the first reflector (6) and transmitted to the workpiece from the imaging lens (7), the vibration is caused by the ultrasonic, the reflected light carries the ultrasonic information to be captured by the imaging lens (7), returns to the light splitting device (3) and reaches the photoelectric detector (8) through reflection;
two beams of return light interfere with each other, and the interference signal is demodulated to obtain a multi-mode ultrasonic signal;
s300, classifying the acquired ultrasonic signals in multiple modes by the signal processing terminal (9), separating the waves in different modes according to different wave propagation speeds of different modes, and respectively imaging to acquire various defect information at one time.
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Cited By (3)
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| CN114088810A (en) * | 2021-11-16 | 2022-02-25 | 宝宇(武汉)激光技术有限公司 | Interference laser ultrasonic nondestructive testing method and system |
| CN114088811A (en) * | 2021-11-16 | 2022-02-25 | 宝宇(武汉)激光技术有限公司 | Nondestructive testing method and system for laser variable-focus special-shaped workpiece |
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Cited By (3)
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| CN113791035A (en) * | 2021-11-15 | 2021-12-14 | 滨州学院 | Laser flaw detection device and laser flaw detection method |
| CN114088810A (en) * | 2021-11-16 | 2022-02-25 | 宝宇(武汉)激光技术有限公司 | Interference laser ultrasonic nondestructive testing method and system |
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Application publication date: 20211112 |