CN214952996U - Laser nondestructive testing device for special-shaped workpiece - Google Patents
Laser nondestructive testing device for special-shaped workpiece Download PDFInfo
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- CN214952996U CN214952996U CN202122544810.1U CN202122544810U CN214952996U CN 214952996 U CN214952996 U CN 214952996U CN 202122544810 U CN202122544810 U CN 202122544810U CN 214952996 U CN214952996 U CN 214952996U
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Abstract
The utility model relates to a heterotypic work piece laser nondestructive test device, include: the laser is used for emitting pulse laser; the cylindrical mirror is arranged at the emergent end of the laser; the galvanometer is arranged at the emergent end of the cylindrical mirror and is carried on the distance adjusting component; the laser range finder is carried on the distance adjusting component; the control end is respectively and electrically connected with the ultrasonic signal receiver, the laser range finder and the distance adjusting component. The effect is as follows: utilize laser range finder and distance adjustment subassembly cooperation, carry out the altitude variation collection to the machined surface in target machining region earlier, distance adjustment subassembly uses the focus of setting for as the zero-bit, carry out the difference calculation to the data change, distance adjustment subassembly assists the galvanometer to reach each point altitude variation, make each point altitude uniformity during dynamic motion, thereby it is high to reach each excitation point ultrasonic energy uniformity, thereby can implement the detection on arbitrary face, do not receive the detection material appearance restriction, in addition, the check point focus position is unified, realize that energy density does not have the differentiation and detect.
Description
Technical Field
The utility model relates to a laser nondestructive test field, concretely relates to heterotypic work piece laser nondestructive test device.
Background
The traditional ultrasonic detection technology has piezoelectric phased array detection, electromagnetic detection, magnetic powder, eddy current, X-ray and other forms of detection, and the traditional detection means has limitations in application, can not effectively detect complex workpieces such as hyperboloids, multi-curved surfaces, abnormal shapes and the like, and mainly solves the problems that the detection precision is reduced due to poor fitting degree due to contact detection and the like.
At present in laser ultrasonic testing field, most all use all to be the pointolite, perhaps the line source scans into the mode of face and detects, and conventional laser ultrasonic testing utilizes the galvanometer to add the field lens and comes the regional detection, but on the abnormal shape face, because the field lens itself has the function of field focusing certainly, can't accomplish every point location focus energy the same on the abnormal shape face, and the ultrasonic wave intensity that leads to the energy to differ arouses differs, and then influences the testing result, makes detection accuracy greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a heterotypic work piece laser nondestructive test device is provided to overcome not enough among the above-mentioned prior art.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a laser nondestructive testing device for special-shaped workpieces comprises:
a laser to emit pulsed laser light;
a cylindrical mirror arranged at an exit end of the laser;
the vibrating mirror is arranged at the emergent end of the cylindrical mirror and is carried on the distance adjusting component;
the laser range finder is carried on the distance adjusting assembly;
and the control end is electrically connected with the ultrasonic signal receiver, the laser range finder and the distance adjusting component respectively.
The utility model has the advantages that:
utilize laser range finder and distance adjustment subassembly cooperation, carry out the altitude variation collection to the machined surface of target machining region earlier, distance adjustment subassembly uses the focus of setting for as the zero-bit, carry out the difference calculation to the data change, distance adjustment subassembly assists the galvanometer to reach each point altitude variation, make each point altitude unanimous during dynamic motion, thereby it is high to reach each excitation point ultrasonic energy uniformity, thereby can implement the detection on arbitrary face, do not receive the detection material appearance restriction, in addition, the check point focus position is unified, realize that energy density does not have the differentiation and detect, non-contact detection precision is high, low power consumption, and is with low costs.
On the basis of the technical scheme, the utility model can also be improved as follows.
Further, the laser device further comprises a beam expander which is arranged between the emergent end of the laser and the incident end of the cylindrical mirror.
Adopt above-mentioned further beneficial effect to do: pulse laser light emitted from the laser can be expanded and collimated.
Further, the cylindrical mirror further comprises a reflecting device which is arranged between the emergent end of the beam expanding mirror and the incident end of the cylindrical mirror.
Further, the reflection device includes:
a first reflector arranged at the exit end of the beam expander;
and a second reflecting mirror disposed between the exit end of the first reflecting mirror and the incident end of the cylindrical mirror.
The beneficial effects of the two steps are as follows: the direction of the light path can be changed.
Further, the ultrasonic signal receiver is an electromagnetic probe.
Further, the single pulse energy density of the pulse laser emitted by the laser is more than 200uJ/cm2The laser pulse width is greater than 2 ns.
Further, the signal delay between the laser range finder and the distance adjusting component is less than or equal to 0.1 ms.
Further, the field lens is arranged at the emergent end of the galvanometer.
Adopt above-mentioned further beneficial effect to do: can be operated as a scan and has a scan surface for focusing the light beam, and can compensate the field curvature and distortion of the device in terms of aberration correction.
Further, the distance adjusting component is a Z-axis servo motor.
Drawings
Fig. 1 is a structural diagram of the laser nondestructive testing device for the special-shaped workpiece.
In the drawings, the components represented by the respective reference numerals are listed below:
1. laser instrument, 2, cylindrical mirror, 3, galvanometer, 4, laser range finder, 5, distance adjusting component, 6, ultrasonic signal receiver, 7, control end, 8, beam expanding mirror, 9, reflecting device, 910, first speculum, 920, second mirror, 10, field lens.
Detailed Description
The principles and features of the invention are described below in conjunction with the following drawings, the examples given are only for explaining the invention and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1, a laser nondestructive testing device for a special-shaped workpiece comprises:
the device comprises a laser 1, a cylindrical mirror 2, a galvanometer 3, a laser range finder 4, a distance adjusting component 5, an ultrasonic signal receiver 6 and a control end 7;
the laser 1 is used for emitting pulse laser;
the cylindrical mirror 2 is arranged at the emergent end of the laser 1, the pulse laser emitted by the laser 1 enters the cylindrical mirror 2, and the cylindrical mirror 2 changes the laser beam from a circular light spot into a linear light spot, so that the linear laser has the advantage of more concentrated energy density compared with the circular light spot;
the galvanometer 3 is arranged at the emergent end of the cylindrical mirror 2 and is carried on the distance adjusting assembly 5, linear light spots emitted by the cylindrical mirror 2 are scanned in a linear mode after being scanned by the galvanometer 3, and compared with scanning of focusing point forming by circular light spots, the scanning width of each scanning is larger;
the laser range finder 4 is carried on the distance adjusting component 5, the power of the distance adjusting component 5 is more than 100W, and the precision of the laser range finder 4 is 0.001-1 mm; the laser range finder 4 emits a beam or a sequence of transient pulse laser beams to a target when in work, the photoelectric element receives the laser beams reflected by the target, the timer measures the time from the emission to the reception of the laser beams, the distance from an observation point to a target point is calculated, and the distance adjusting component 5 changes in real time according to the real-time feedback of the laser range finder 4 to ensure the consistency of the detection focal length;
the signal output part of the ultrasonic signal receiver 6 is electrically connected with the signal input part of the control end 7, the ultrasonic signal receiver 6 receives ultrasonic signals generated by a target under laser excitation, the control end 7 acquires signals collected by the ultrasonic signal receiver 6 and analyzes the signals, so as to realize nondestructive detection, in addition, the signal output part of the control end 7 can be electrically connected with the signal input part of the laser 1, the laser 1 can be controlled to work through the control end 7, the signal output part of the control end 7 can be electrically connected with the signal input part of the distance adjusting component 5, the distance adjusting component 5 can be controlled to work through the control end 7, the signal input part of the control end 7 can be electrically connected with the signal output part of the laser range finder 4, and data measured by the laser range finder 4 can be known.
Example 2
As shown in fig. 1, this embodiment is further optimized based on embodiment 1, and it specifically includes the following steps:
the non-destructive testing device for the laser of the special-shaped workpiece further comprises a beam expanding lens 8, the beam expanding lens 8 is arranged between the emergent end of the laser 1 and the incident end of the cylindrical mirror 2, the beam expanding lens 8 is used for expanding and collimating pulse laser emitted from the laser 1, and the beam expanding lens 8 is adjustable by 1-10 times.
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 laser nondestructive testing device for the special-shaped workpieces further comprises a reflecting device 9, wherein the reflecting device 9 is arranged between the emergent end of the beam expander 8 and the incident end of the cylindrical mirror 2, and can change the direction of the light beam emitted to the cylindrical mirror 2 by the beam expander 8.
Example 4
As shown in fig. 1, this embodiment is further optimized based on embodiment 3, and it specifically includes the following steps:
the reflection device 9 includes: a first mirror 910 and a second mirror 920;
the first reflector 910 is arranged at the exit end of the beam expander 8;
the second mirror 920 is disposed between the exit end of the first mirror 910 and the incident end of the cylindrical mirror 2; the beam emitted from the beam expander 8 is first redirected by the first mirror 910 and then emitted to the second mirror 920, and then redirected by the second mirror 920 and emitted to the cylindrical mirror 2.
Example 5
As shown in fig. 1, this embodiment is further optimized based on any one of embodiments 1 to 4, and specifically includes the following steps:
the ultrasonic signal receiver 6 is preferably an electromagnetic probe, although other probes are not excluded.
Example 6
As shown in fig. 1, this embodiment is further optimized based on any one of embodiments 1 to 5, and specifically includes the following steps:
the single pulse energy density of the pulse laser emitted by the laser 1 is more than 200uJ/cm2The laser pulse width is larger than 2ns, and the frequency of the laser 1 is in the adjustable range of 1 Hz-100 KHz.
Example 7
As shown in fig. 1, this embodiment is further optimized based on any one of embodiments 1 to 6, and specifically includes the following steps:
the signal delay between the laser range finder 4 and the distance adjusting component 5 is less than or equal to 0.1 ms.
Example 8
As shown in fig. 1, this embodiment is further optimized based on any one of embodiments 1 to 7, and specifically includes the following steps:
the laser nondestructive testing device for the special-shaped workpiece further comprises a field lens 10, the field lens 10 is arranged at the emergent end of the galvanometer 3, the field lens 10 can be used for scanning work and has a scanning breadth, the field lens can be used for focusing light beams, and in the aspect of aberration correction, the field curvature and distortion of the device can be compensated.
For the embodiments, the control terminal 7 may be a PC terminal, and the distance adjusting assembly 5 is preferably a Z-axis servo motor (linear module).
The working process is as follows:
the galvanometer 3 is calibrated, and the scanning pattern of the calibrated galvanometer 3 is not deformed and is not scaled in size;
the method comprises the steps that a laser range finder 4 collects points in advance, the laser range finder 4 is placed in a target region to be detected, the laser range finder 4 is used for collecting N point positions (the number of the point positions is consistent with that of scanning point positions), and height changes are generated;
starting the laser 1 to scan, setting a focal length position, taking the preset focal length position as a zero position, generating a difference value of each point position with a pre-acquisition point of the laser range finder 4, starting scanning from the first point position scanned by the laser range finder 4, and changing the distance adjusting assembly 5 along with the difference value;
the ultrasonic signal receiver 6 receives ultrasonic signals generated by the target under the excitation of laser, filters the ultrasonic signals through the control end 7, collects the ultrasonic signals in real time, and finally analyzes and processes the ultrasonic signals.
The detection method comprises the steps that the laser range finder 4 is matched with the distance adjusting assembly 5, firstly, height change collection is carried out on a processing surface of a target processing area, the distance adjusting assembly 5 takes a set focal length as a zero position, difference value calculation is carried out on data change, the distance adjusting assembly 5 assists the vibrating mirror 3 to achieve height change of each point, the height of each point is consistent during dynamic motion, and therefore the consistency of ultrasonic energy of each excitation point is high.
Although embodiments of the invention have been shown and described, it is to be understood that they have been presented by way of example only, and not limitation, and that changes, modifications, substitutions and alterations may be made by those skilled in the art without departing from the scope of the invention.
Claims (9)
1. A non-destructive laser detection device for special-shaped workpieces is characterized by comprising:
a laser (1) for emitting pulsed laser light;
a cylindrical mirror (2) arranged at the exit end of the laser (1);
the galvanometer (3) is arranged at the emergent end of the cylindrical mirror (2) and is carried on the distance adjusting component (5);
a laser range finder (4) mounted on the distance adjustment unit (5);
and the control end (7) is electrically connected with the ultrasonic signal receiver (6), the laser (1), the laser range finder (4) and the distance adjusting component (5) respectively.
2. The laser nondestructive testing device for the special-shaped workpiece according to claim 1, characterized in that: the laser device further comprises a beam expander (8) which is arranged between the exit end of the laser (1) and the entrance end of the cylindrical mirror (2).
3. The laser nondestructive testing device for the special-shaped workpiece according to claim 2, characterized in that: and the reflecting device (9) is arranged between the exit end of the beam expander (8) and the entrance end of the cylindrical mirror (2).
4. The laser nondestructive testing device for the special-shaped workpiece according to claim 3, characterized in that: the reflecting device (9) comprises:
a first reflector (910) arranged at the exit end of the beam expander (8);
a second mirror (920) arranged between the exit end of the first mirror (910) and the entrance end of the cylindrical mirror (2).
5. The laser nondestructive testing device for the special-shaped workpiece according to claim 1, characterized in that: the ultrasonic signal receiver (6) is an electromagnetic probe.
6. The laser nondestructive testing device for the special-shaped workpiece according to any one of claims 1 to 5, characterized in that: the single pulse energy density of the pulse laser emitted by the laser (1) is more than 200uJ/cm2The laser pulse width is greater than 2 ns.
7. The laser nondestructive testing device for the special-shaped workpiece according to any one of claims 1 to 5, characterized in that: and the signal delay between the laser range finder (4) and the distance adjusting component (5) is less than or equal to 0.1 ms.
8. The laser nondestructive testing device for the special-shaped workpiece according to any one of claims 1 to 5, characterized in that: the field lens (10) is arranged at the emergent end of the galvanometer (3).
9. The laser nondestructive testing device for the special-shaped workpiece according to any one of claims 1 to 5, characterized in that: the distance adjusting component (5) is a Z-axis servo motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122544810.1U CN214952996U (en) | 2021-10-22 | 2021-10-22 | Laser nondestructive testing device for special-shaped workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122544810.1U CN214952996U (en) | 2021-10-22 | 2021-10-22 | Laser nondestructive testing device for special-shaped workpiece |
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| Publication Number | Publication Date |
|---|---|
| CN214952996U true CN214952996U (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122544810.1U Active CN214952996U (en) | 2021-10-22 | 2021-10-22 | Laser nondestructive testing device for special-shaped workpiece |
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| Country | Link |
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| CN (1) | CN214952996U (en) |
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2021
- 2021-10-22 CN CN202122544810.1U patent/CN214952996U/en active Active
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