CN113702495B

CN113702495B - Laser electromagnetic two-in-one probe and nondestructive testing device comprising same

Info

Publication number: CN113702495B
Application number: CN202110851800.4A
Authority: CN
Inventors: 赵成; 周永祥; 李震
Original assignee: Baoyu Wuhan Laser Technology Co ltd
Current assignee: Baoyu Wuhan Laser Technology Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2023-05-05
Anticipated expiration: 2041-07-27
Also published as: CN113702495A

Abstract

The invention relates to a laser electromagnetic two-in-one probe, which comprises: a case having a container made of a resin material and containing a potassium chromate solution therein; an optical prism disposed within the housing and above the container; the bottom of the solar cell is plated with an energy absorption layer; the QBH connector is arranged on the shell and is positioned above the optical prism; the electromagnetic probe is arranged on the shell, and the working surface of the electromagnetic probe is flush with or protrudes out of the bottom surface of the shell. A non-destructive inspection apparatus comprising: the laser, the data processor and the laser electromagnetic two-in-one probe; the laser is connected with the QBH connector, and the data processor is electrically connected with the electromagnetic probe. The beneficial effects are that: the problems of weaker signals and the like under the condition of laser nondestructive are solved, and the use of a coupling agent in the traditional piezoelectric ultrasonic detection process is abandoned; the method is suitable for on-line monitoring and can replace the traditional operation mode.

Description

Laser electromagnetic two-in-one probe and nondestructive testing device comprising same

Technical Field

The invention relates to the technical field of laser nondestructive testing, in particular to a laser electromagnetic two-in-one probe and a nondestructive testing device comprising the same.

Background

The laser ultrasonic detection technology mainly relies on interaction of high-energy laser and a test piece to cause local expansion in the test piece to generate ultrasonic signals, but the absorption rate of the material to laser energy is too low to cause the excitation efficiency to be too low, so that slight ablation damage can be caused to the surface of the material when the laser energy is too high, the nondestructive detection requirement is not met, and if the laser energy is too low, ultrasonic signals can not be excited or the excited ultrasonic signals are too small, so that defect detection and material evaluation are not facilitated. In addition, in some specific applications, such as medical diagnosis, detection by high-precision instruments, etc., it is undesirable to cause thermodynamic changes in the object to be detected. Therefore, on one hand, the excitation efficiency of laser ultrasound needs to be improved, on the other hand, the excitation part of laser ultrasound needs to be designed, and nondestructive detection is performed on the premise of not causing thermodynamic changes of the detected object, but the corresponding technology is lacking at present.

Disclosure of Invention

The invention aims to solve the technical problem of providing a laser electromagnetic two-in-one probe and a nondestructive testing device comprising the same, so as to overcome the defects in the prior art.

The technical scheme for solving the technical problems is as follows: a laser electromagnetic two-in-one probe, comprising:

a case having a container made of a resin material and containing a potassium chromate solution therein;

an optical prism disposed within the housing and above the container; the bottom of the solar cell is plated with an energy absorption layer;

the QBH connector is arranged on the shell and is positioned above the optical prism;

the electromagnetic probe is fixed with the shell, and the working surface of the electromagnetic probe is flush with or protrudes out of the bottom surface of the shell.

On the basis of the technical scheme, the invention can be improved as follows.

Further, the energy absorbing layer is a chromium plating.

Further, the thickness of the energy absorbing layer is greater than 10nm.

Further, the optical prism is made of quartz material.

A non-destructive inspection apparatus comprising: the laser, the data processor and the laser electromagnetic two-in-one probe; the laser is connected with the QBH connector, and the data processor is electrically connected with the electromagnetic probe.

The adoption of the method has the further beneficial effects that: the method is suitable for on-line monitoring and can replace the traditional operation mode.

Further, the energy density of the laser single pulse emitted by the laser is more than 200uJ/cm < square >, the laser frequency is 1 KHz-100 KHz, and the laser pulse width is more than 2ns.

Further, the data processor comprises a filter, a signal amplifier, a high-speed acquisition signal card and a PC end, and the electromagnetic probe, the filter, the signal amplifier, the high-speed acquisition signal card and the PC end are electrically connected in sequence.

Further, the laser is signal synchronized with the high-speed acquisition signal card.

Further, the adjustment value of the amplifier is 10 dB-60 dB.

Furthermore, the sampling frequency of the high-speed acquisition signal card is more than 2 times of the maximum frequency of the signal.

The beneficial effects of the invention are as follows:

the laser device is incident into the optical prism through the light beam that the QBH connector sent on with certain incidence angle degree, the laser energy of incidence in the optical prism is absorbed by the chromium coating, produces the inflation when accumulating certain value and excites the ultrasonic wave of stronger intensity, send the ultrasonic wave through the chromium coating after the energy absorption inflation to pass to the work piece through potassium chromate solution with low consumption mode, receive through electromagnetic probe homonymy at last, the signal is weaker scheduling problem under the harmless condition of laser has been solved, the use of couplant in the traditional piezoelectricity ultrasonic testing process has been abandoned.

Drawings

FIG. 1 is a block diagram of a laser electromagnetic two-in-one probe according to the present invention;

fig. 2 is a block diagram of a nondestructive inspection apparatus according to the present invention.

In the drawings, the list of components represented by the various numbers is as follows:

1. the device comprises a shell, 2, a container, 3, an optical prism, 4, a chromium coating, 5, a QBH connector, 6, an electromagnetic probe, 7, a laser, 8, a data processor, 810, a filter, 820, a signal amplifier, 830, a high-speed acquisition signal card, 840 and a PC end.

Detailed Description

The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.

Example 1

As shown in fig. 1, a laser electromagnetic two-in-one probe includes: a housing 1, a container 2, an optical prism 3, a QBH connector 5 and an electromagnetic probe 6;

the container 2 made of resin material and containing potassium chromate solution is arranged in the shell 1, so that the potassium chromate solution has good energy absorption and can be used for improving the photoacoustic conversion efficiency;

an optical prism 3 is disposed within the housing 1, and the optical prism 3 is located above the container 2; the bottom of the optical prism 3 is plated with an energy absorption layer 4;

the QBH connector 5 is provided on the housing 1, and the QBH connector 5 is located above the optical prism 3;

the electromagnetic probe 6 is fixed with the shell 1, the electromagnetic probe 6 can be encapsulated in the shell 1, and the working surface of the electromagnetic probe 6 is flush with or protrudes out of the bottom surface of the shell 1.

In addition, in the present invention, the incident surface of the optical prism 3 is inclined at an angle, and the specific inclination angle is determined according to the actual situation, for example, in the present invention schematic diagram, the incident surface of the optical prism 3 is inclined at 45 °.

Example 2

As shown in fig. 1, this embodiment is a further optimization performed on the basis of embodiment 1, which is specifically as follows:

the energy absorbing layer 4 is preferably a chromium coating, and the absorption rate of metallic chromium to laser is good, the thermal expansion coefficient is low, and the ultrasonic signal is easy to release through thermal expansion.

And typically the thickness of the energy absorbing layer 4 is greater than 10nm.

Example 3

As shown in fig. 1, this embodiment is a further optimization performed on the basis of

embodiment

1 or 2, which is specifically as follows:

the optical prism 3 is made of quartz material, the damage threshold is high, the optical prism can be used as a long-term material, and the optical prism can change the direction of the light beam without changing the vergence.

Example 4

As shown in fig. 2, a nondestructive inspection apparatus includes: the laser 7, the data processor 8 and the laser electromagnetic two-in-one probe; the laser 7 is connected with the QBH connector 5, and the data processor 8 is electrically connected with the electromagnetic probe 6.

Example 5

As shown in fig. 2, this embodiment is a further optimization performed on the basis of embodiment 4, which is specifically as follows:

the energy density of the laser single pulse emitted by the laser 7 is more than 200uJ/cm < DEG >, the laser frequency is 1 KHz-100 KHz, and the laser pulse width is more than 2ns.

Example 6

As shown in fig. 2, this embodiment is a further optimization performed on the basis of

embodiment

4 or 5, which is specifically as follows:

the data processor 8 includes a filter 810, a signal amplifier 820, a high-speed acquisition signal card 830 and a PC end 840, where the signal output end of the electromagnetic probe 6 is electrically connected to the signal input end of the filter 810, the signal output end of the filter 810 is electrically connected to the signal input end of the signal amplifier 820, the signal output end of the signal amplifier 820 is electrically connected to the signal input end of the high-speed acquisition signal card 830, and the signal output end of the high-speed acquisition signal card 830 is electrically connected to the signal input end of the PC end 840.

Example 7

As shown in fig. 2, this embodiment is a further optimization performed on the basis of embodiment 6, which is specifically as follows:

the output light signal of the laser 7 is connected and controlled through a 5V synchronous signal and the high-speed acquisition signal card 830 needs to keep signal synchronization.

Example 8

embodiment

6 or 7, which is specifically as follows:

the adjusting value of the amplifier is 10 dB-60 dB.

Example 9

embodiment

6 or 7 or 8, which is specifically as follows:

the sampling frequency of the high-speed acquisition signal card 830 is more than 2 times of the maximum frequency of the signal.

The use flow is as follows:

wiping the laser outlet with alcohol ensures that no dirt on the surface of the optical device affects the laser beam power:

checking the optical path of the laser 7, which does not change with the test movement;

the beam emitted by the laser 7 via the QBH connector 5 is incident on the optical prism 3, where the optical prism 3 acts as a beam confinement layer;

the laser energy entering the optical prism 3 is absorbed by the energy absorbing layer 4, and when a certain value is accumulated, the ultrasonic wave with stronger intensity is generated by expansion excitation;

the energy absorption layer 4 after energy absorption expansion emits ultrasonic waves and transmits the ultrasonic waves to a workpiece in a low-consumption mode through potassium chromate solution, wherein the potassium chromate solution is used as a coupling layer;

by receiving the electromagnetic probe 6 on the same side, the working surface of the electromagnetic probe 6 is generally attached to the surface of the workpiece;

the filter 810 and the signal amplifier 820 are adjusted to filter and amplify the effective ultrasonic signal, and clutter signals generated by the interference of the electric signal and noise signals influenced by the environment are filtered;

the filtered and amplified signals are transmitted to the PC terminal for processing through the high-speed acquisition signal card 830, and the result is output.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A laser electromagnetic two-in-one probe, comprising:

a case (1) having a container (2) made of a resin material and containing a potassium chromate solution therein;

an optical prism (3) which is provided in the housing (1) and is located above the container (2); the bottom of the optical prism is plated with an energy absorption layer (4), the energy absorption layer (4) is a chromium coating, laser energy which is incident into the optical prism (3) is absorbed by the energy absorption layer (4), ultrasonic waves are emitted by the energy absorption layer (4) after energy absorption expansion, and the ultrasonic waves are transmitted to a workpiece in a low-consumption mode through potassium chromate solution;

a QBH connector (5) which is provided on the housing (1) and is located above the optical prism (3);

and the electromagnetic probe (6) is fixed with the shell (1), and the working surface of the electromagnetic probe is flush with or protrudes out of the bottom surface of the shell (1).

2. A laser electromagnetic two-in-one probe according to claim 1, characterized in that the thickness of the energy absorbing layer (4) is greater than 10nm.

3. The two-in-one laser and electromagnetic probe according to claim 1, wherein the optical prism (3) is made of quartz material.

4. A non-destructive inspection apparatus, comprising: a laser (7), a data processor (8) and a laser electromagnetic two-in-one probe according to any one of claims 1 to 3; the laser (7) is connected with the QBH connector (5), and the data processor (8) is electrically connected with the electromagnetic probe (6).

5. A nondestructive testing device according to claim 4, wherein the laser (7) emits laser single pulse with energy density greater than 200uJ/cm, laser frequency of 1 KHz-100 KHz and laser pulse width greater than 2ns.

6. The nondestructive inspection apparatus of claim 4 wherein the data processor (8) comprises a filter (810), a signal amplifier (820), a high-speed acquisition signal card (830) and a PC side (840), the electromagnetic probe (6), the filter (810), the signal amplifier (820), the high-speed acquisition signal card (830) and the PC side (840) being electrically connected in sequence.

7. A nondestructive testing device according to claim 6, wherein the laser (7) is signal synchronized with the high speed acquisition signal card (830).

8. The nondestructive testing device of claim 6, wherein the amplifier has an adjustment value of 10dB to 60dB.

9. The nondestructive testing device of claim 6, wherein the sampling frequency of the high-speed acquisition signal card (830) is more than 2 times the maximum frequency of the signal.