CN215766948U - Laser nondestructive testing device for detecting metal thickness change - Google Patents
Laser nondestructive testing device for detecting metal thickness change Download PDFInfo
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- CN215766948U CN215766948U CN202121619510.9U CN202121619510U CN215766948U CN 215766948 U CN215766948 U CN 215766948U CN 202121619510 U CN202121619510 U CN 202121619510U CN 215766948 U CN215766948 U CN 215766948U
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- 239000002184 metal Substances 0.000 title claims abstract description 19
- 230000008859 change Effects 0.000 title claims abstract description 15
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 20
- 239000000523 sample Substances 0.000 claims abstract description 14
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
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- 238000001514 detection method Methods 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 9
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- 239000003345 natural gas Substances 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000009683 ultrasonic thickness measurement Methods 0.000 description 4
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- 230000007797 corrosion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
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- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model relates to a laser nondestructive testing device for detecting metal thickness change, which comprises: the laser, the beam expander, the reflector, the focusing mirror and the vibrating mirror are sequentially arranged along a laser excitation ultrasonic signal propagation path; the device also comprises a longitudinal wave electromagnetic probe, a filter, an amplifier and a data processing module which are electrically connected in sequence. The beneficial effects are that: the laser nondestructive detection is adopted to replace the ultrasonic detection, so that the problem that the traditional detection cannot be carried out on the special-shaped workpiece is solved; the limitation of the detection range in the traditional detection process is solved; the use of a coupling agent in the traditional detection process is abandoned; the method is suitable for different types of metal workpieces with the thickness of 2-200mm, and can be applied to the fields of petroleum and natural gas transmission pipelines, steel manufacturing, ship manufacturing and the like.
Description
Technical Field
The utility model relates to the technical field of nondestructive testing, in particular to a laser nondestructive testing device for detecting metal thickness change.
Background
Ultrasonic thickness measurement is a technique for measuring the thickness of a metal workpiece by using an ultrasonic technique, and all materials which can be transmitted in the ultrasonic thickness measurement device at a constant speed can be adopted by the ultrasonic thickness measurement device. The piezoelectric transistor probe in the traditional ultrasonic thickness measurement technology is required to be in contact with a material to be detected, a couplant is generally required to be coated to improve the ultrasonic coupling effect, the detection range is only effective in a placement area, and regional detection cannot be realized. The surface of the probe is made of acrylic resin, so that the sensitivity is reduced due to easy abrasion, and a large number of corrosion pits are formed on the back surface of a measured object. Due to rusty spots and corrosion pits on the other surface of the measured object, sound waves are attenuated, so that the reading is changed irregularly and even does not have reading under extreme conditions.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a laser nondestructive testing device for detecting metal thickness change, so as to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: a laser non-destructive inspection apparatus for detecting metal thickness variations, comprising:
the laser, the beam expander, the reflector, the focusing mirror and the vibrating mirror are sequentially arranged along a laser excitation ultrasonic signal propagation path;
the device also comprises a longitudinal wave electromagnetic probe, a filter, an amplifier and a data processing module which are electrically connected in sequence.
On the basis of the technical scheme, the utility model can be further improved as follows.
Further, the data processing module includes:
the high-speed acquisition signal card is electrically connected with the signal output end of the amplifier;
the signal processing unit is electrically connected with the signal output end of the high-speed acquisition signal card;
and the data display unit is electrically connected with the signal output end of the signal processing unit.
Furthermore, the light-emitting signal of the laser is synchronous with the longitudinal wave electromagnetic probe and the high-speed acquisition signal card signal and is connected and controlled through a 5V synchronous signal.
Further, the laser single pulse energy density of the laser beam emitted by the laser is more than 200uj/cm2。
Furthermore, the laser frequency of the laser beam emitted by the laser is 10Hz to 100 KHz.
Further, the laser pulse width of the laser beam emitted by the laser is more than 2 ns.
Furthermore, the center of the laser beam emitted by the laser passes through the beam expanding lens, the focusing lens and the vibrating lens and is collimated to be 0.1-2 degrees.
The utility model has the beneficial effects that:
1) the laser nondestructive detection is adopted to replace the ultrasonic detection, so that the problem that the traditional detection cannot be carried out on the special-shaped workpiece is solved;
2) the limitation of the detection range in the traditional detection process is solved;
3) the use of a coupling agent in the traditional detection process is abandoned;
4) the device can integrate data acquisition, analysis, visual presentation and trend change of the thickness change of the workpiece;
5) the method is suitable for different types of metal workpieces with the thickness of 2-200mm, and can be applied to the fields of petroleum and natural gas transmission pipelines, steel manufacturing, ship manufacturing and the like.
Drawings
FIG. 1 is a structural view of a laser nondestructive inspection apparatus for inspecting a change in metal thickness according to the present invention;
FIG. 2 is a circuit diagram of the laser nondestructive testing apparatus for detecting metal thickness variation according to the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the device comprises a laser, 2, a beam expander, 3, a reflector, 4, a focusing mirror, 5, a vibrating mirror, 6, a longitudinal wave electromagnetic probe, 7, a filter, 8, an amplifier, 9, a data processing module, 910, a high-speed acquisition signal card, 920, a signal processing unit, 930, a data display unit, 10 and a workpiece.
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 utility model.
Example 1
As shown in fig. 1, a laser nondestructive inspection apparatus for detecting a change in metal thickness includes:
the device comprises a laser 1, a beam expander 2, a reflector 3, a focusing mirror 4, a vibrating mirror 5, a longitudinal wave electromagnetic probe 6, a filter 7, an amplifier 8 and a data processing module;
the laser 1, the beam expander 2, the reflector 3, the focusing mirror 4 and the vibrating mirror 5 are sequentially arranged along a propagation path of a laser excitation ultrasonic signal, namely, a laser beam emitted by the laser 1 enters from the center of a light inlet of the beam expander 2, then exits from the center of a light outlet of the beam expander 2, then passes through the reflector 3, enters the center of the vibrating mirror 5 after passing through the focusing mirror 4, and finally irradiates on a workpiece 10;
the longitudinal wave electromagnetic probe 6 is arranged close to or attached to the workpiece, the signal output end of the longitudinal wave electromagnetic probe 6 is electrically connected with the signal input end of the filter 7, the signal output end of the filter 7 is electrically connected with the signal input end of the amplifier 8, and the signal output end of the amplifier 8 is electrically connected with the signal input end of the data processing module 9.
Example 2
As shown in fig. 2, this embodiment is further optimized based on embodiment 1, and it specifically includes the following steps:
the data processing module 9 includes: a high-speed acquisition signal card 910, a signal processing unit 920 and a data display unit 930,
the signal input end of the high-speed acquisition signal card 910 is electrically connected with the signal output end of the amplifier 8;
the signal input end of the signal processing unit 920 is electrically connected with the signal output end of the high-speed acquisition signal card 910;
a signal input terminal of the data display unit 930 is electrically connected to a signal output terminal of the signal processing unit 920.
Example 3
As shown in fig. 1 to fig. 2, this embodiment is further optimized based on embodiment 1 or 2, and specifically includes the following steps:
the light signal of the laser 1 is synchronous with the longitudinal wave electromagnetic probe 6 and the high-speed acquisition signal card 910, and is connected and controlled by a 5V synchronous signal.
Example 4
As shown in fig. 1 to 2, this embodiment is further optimized based on any one of embodiments 1 to 3, and specifically includes the following steps:
the laser single pulse energy density of the laser beam emitted by the laser 1 is more than 200uj/cm2。
Example 5
As shown in fig. 1 to 2, this embodiment is further optimized based on any one of embodiments 1 to 4, and specifically includes the following steps:
the laser frequency of the laser beam emitted by the laser 1 needs to meet the adjustable range of 10 Hz-100 KHz.
Example 6
As shown in fig. 1 to 2, this embodiment is further optimized based on any one of embodiments 1 to 5, and specifically includes the following steps:
the laser pulse width of the laser beam emitted by the laser 1 is greater than 2 ns.
Example 7
As shown in fig. 1 to 2, this embodiment is further optimized based on any one of embodiments 1 to 6, and specifically includes the following steps:
the center of the laser beam emitted by the laser 1 passes through the beam expanding lens 2, the focusing lens 4 and the vibrating lens 5 and is collimated to be 0.1-2 degrees.
Example 8
As shown in fig. 1 to 2, this embodiment is further optimized based on any one of embodiments 1 to 7, and specifically includes the following steps:
the amplifier 8 needs to be adjusted to a value of 10-60.
Example 9
As shown in fig. 1 to 2, this embodiment is further optimized based on any one of embodiments 1 to 8, and specifically includes the following steps:
the size of a light spot formed by a laser beam emitted by the laser 1 after passing through the beam expander 2 is required to meet the diameter of an incident light through hole.
Example 10
As shown in fig. 1 to 2, this embodiment is further optimized based on any one of embodiments 2 to 9, and specifically includes the following steps:
the sampling frequency of the high-speed signal acquisition card 910 needs to be more than 2 times of the maximum frequency of the signal.
Application example
Sample 15mm carbon steel plate
Firstly, wiping an outlet of a laser 1, a beam expanding lens 2, a reflecting mirror 3, a focusing lens 4 and a vibrating lens 5 by alcohol to protect lenses and ensure that the surface of an optical device is free from dirt to influence the power of a laser beam;
secondly, checking the light path of the laser 1 to enable the laser beam to enter from the center of a light inlet of the beam expander 2 and exit from the center of a light outlet, and then the laser beam enters the center of the vibrating mirror 5 after passing through the reflector 3 and the focusing mirror 4, wherein the laser beam is consistent with the centers of all the lenses all the time in the detection process and does not change along with the movement of the test;
thirdly, determining a scanning area of the galvanometer 5, and placing a longitudinal wave electromagnetic probe 6 on one side of the scanning area;
fourthly, adjusting a filter 7 and an amplifier 8 to amplify the effective ultrasonic signals and filter out clutter signals generated by the interference of the electric signals and noise signals influenced by the environment;
fifthly, determining a detection path, and setting parameters of the laser 1 to enable the single-pulse energy density of the laser 1 to meet the excitation intensity of the ultrasonic signal;
sixthly, calling a preset template in the data processing module 9, and applying the preset template to a central point of the laser detection position;
seventhly, selecting areas needing to be processed, and sequentially detecting;
eighthly, transmitting the ultrasonic signals to a signal processing unit 920 through a high-speed acquisition signal card 910, analyzing and calculating, and displaying the detection position in real time through a data display unit 930;
and ninthly, processing the detected data into a paper report after data analysis, and outputting a thickness change curve and a thickness change quantity.
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 (7)
1. A laser non-destructive inspection apparatus for detecting metal thickness variations, comprising:
the laser device comprises a laser (1), a beam expander (2), a reflector (3), a focusing mirror (4) and a vibrating mirror (5) which are sequentially arranged along a propagation path of a laser excitation ultrasonic signal;
the device also comprises a longitudinal wave electromagnetic probe (6), a filter (7), an amplifier (8) and a data processing module (9) which are electrically connected in sequence.
2. The laser non-destructive testing device for testing metal thickness variations according to claim 1, characterized in that said data processing module (9) comprises:
the high-speed acquisition signal card (910) is electrically connected with the signal output end of the amplifier (8);
the signal processing unit (920) is electrically connected with the signal output end of the high-speed acquisition signal card (910);
and the data display unit (930) is electrically connected with the signal output end of the signal processing unit (920).
3. The laser nondestructive testing device for detecting the metal thickness change is characterized in that the optical signal of the laser (1) is synchronized with the signals of the longitudinal wave electromagnetic probe (6) and the high-speed acquisition signal card (910) and is connected and controlled by a 5V synchronization signal.
4. The laser non-destructive testing device for testing metal thickness variation according to claim 1, characterized in that said laser (1) emits a laser beam having a laser single pulse energy density greater than 200uj/cm2。
5. The laser nondestructive testing device for testing the thickness change of metal according to claim 1 is characterized in that the laser frequency of the laser beam emitted by the laser (1) is 10 Hz-100 KHz.
6. The laser nondestructive testing apparatus for detecting metal thickness variation according to claim 1, wherein the laser pulse width of the laser beam emitted from the laser (1) is greater than 2 ns.
7. The laser nondestructive testing device for detecting the metal thickness change according to claim 1, wherein the laser beam emitted by the laser (1) passes through the beam expanding lens (2), the focusing lens (4) and the vibrating lens (5) and the beam center is collimated at 0.1-2 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121619510.9U CN215766948U (en) | 2021-07-15 | 2021-07-15 | Laser nondestructive testing device for detecting metal thickness change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121619510.9U CN215766948U (en) | 2021-07-15 | 2021-07-15 | Laser nondestructive testing device for detecting metal thickness change |
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| Publication Number | Publication Date |
|---|---|
| CN215766948U true CN215766948U (en) | 2022-02-08 |
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| CN202121619510.9U Active CN215766948U (en) | 2021-07-15 | 2021-07-15 | Laser nondestructive testing device for detecting metal thickness change |
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| Country | Link |
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2021
- 2021-07-15 CN CN202121619510.9U patent/CN215766948U/en active Active
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