CN217528517U - Uniform line light spot laser cleaning device - Google Patents
Uniform line light spot laser cleaning device Download PDFInfo
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- CN217528517U CN217528517U CN202221002619.2U CN202221002619U CN217528517U CN 217528517 U CN217528517 U CN 217528517U CN 202221002619 U CN202221002619 U CN 202221002619U CN 217528517 U CN217528517 U CN 217528517U
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Abstract
The utility model discloses a uniform line light spot laser cleaning device, which comprises a laser, a scanning galvanometer, an energy transmission optical fiber, a controller and a field lens, wherein a Q switch is arranged in the laser and is used for generating laser pulse; the scanning galvanometer is used for reflecting laser generated by the laser; the energy transmission optical fiber transmits laser emitted by the laser to the scanning galvanometer; the controller is used for sending a TTL signal and a Q switch control signal to the laser and sending a galvanometer control signal to the scanning galvanometer, wherein the TTL signal is used for prompting the laser to generate a pulse train, the Q switch control signal is used for controlling the working state of the Q switch, the galvanometer control signal is a symmetrical triangular wave, and the TTL signal, the Q switch control signal and the galvanometer control signal are synchronous signals; the field lens and the scanning galvanometer are arranged in a counter-shaft manner to realize the focusing of the light beams. The utility model discloses simple structure, convenient to use can control the number that restraines the pulse, realizes accurate control, eliminates the colour difference that the inhomogeneous power density in scanning line both ends arouses.
Description
Technical Field
The utility model belongs to the technical field of the laser cleaning technique and specifically relates to a uniform line light spot laser cleaning device is related to.
Background
The laser cleaning is a novel green industrial cleaning technology which utilizes the laser with narrow pulse width and high energy density to act on the surface of an object to be cleaned, and makes dirt separate from a substrate under the combined action of mechanisms such as rapid optical vibration, vaporization, decomposition, plasma stripping and the like, thereby realizing surface cleaning. The laser cleaning device generally comprises a laser and a scanning galvanometer, and the laser is generally divided into a fiber laser and a solid laser. The solid laser is an ideal light source for laser cleaning due to higher pulse energy and peak power and higher anti-reflection capability. Pulsed solid-state lasers typically have the generation and repetition rate of the pulses controlled by a Q-switch, which is driven by a Q-switch to control turn-off. The laser generated by the solid laser is coupled into the flexible optical fiber and is connected with the scanning galvanometer, so that the common laser scanning is realized, and the most common one-dimensional scanning galvanometer is used.
The evaluation of the laser cleaning effect has various types, such as the thickness of cleaning pollutants, cleaning efficiency, influence on a base material, chromatic aberration and the like. For solid state lasers, high energy pulses can clean thicker surface contaminants, resulting in higher cleaning efficiency. Most of the high-energy solid lasers are in a multi-mode form, light spots are distributed more uniformly, and the action length is shorter, so that the damage to a base material is better than that of other types of lasers. The generation of chromatic aberration is mostly caused by the uneven pulse energy density, and in the one-dimensional scanning system, the energy density at two ends of a scanning line is higher due to the acceleration and deceleration processes of a galvanometer, so that chromatic aberration is generated. Common methods for obtaining uniform scanning include the use of a rotating mirror, which is a complex system and still requires additional means to control the scanning width; there is also a method of pulse control technology outside the laser, which usually requires additional devices and also requires additional signal synchronization technology, increasing the cost; there are also patents that mention controlling the laser drive current to vary the power at both ends, but this method is rough and rapid switching off of large drive currents tends to cause a reduction in the lifetime of the laser; in addition, a method of shielding light spots at two ends is adopted, but the method can only be fixed on one scanning width.
SUMMERY OF THE UTILITY MODEL
To the technical problem who exists above-mentioned, the utility model aims at: the uniform line light spot laser cleaning device can effectively eliminate chromatic aberration at two ends of a scanning line.
In order to achieve the above object, the utility model provides a following technical scheme:
a uniform line spot laser cleaning device, comprising:
a laser having a Q-switch disposed therein for generating laser pulses;
the scanning galvanometer is used for reflecting laser generated by the laser;
the energy transmission optical fiber transmits the laser emitted by the laser to the scanning galvanometer;
the controller is used for sending a TTL signal and a Q switch control signal to the laser and sending a galvanometer control signal to the scanning galvanometer, wherein the TTL signal is used for prompting the laser to generate a pulse train, the Q switch control signal is used for controlling the working state of the Q switch, the galvanometer control signal is a symmetrical triangular wave, and the TTL signal, the Q switch control signal and the galvanometer control signal are synchronous signals;
and the field lens and the scanning galvanometer are arranged in a countershaft manner to realize the focusing of the light beams.
Preferably, the laser is a pulsed solid state laser.
Preferably, the single pulse energy of the laser is 1mJ-150mJ, and the peak power is 3MW.
Preferably, the repetition frequency of the TTL signal is 10kHz, and the duty ratio is 2%.
Preferably, the frequency of the Q-switch control signal is 2 times the frequency of the galvanometer control signal.
Preferably, the deflection angle of the scanning galvanometer is +/-12 degrees, and the focal length of the field lens is 160mm.
Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:
the utility model discloses even line light spot laser belt cleaning device includes laser instrument, scanning mirror, biography can optic fibre, controller and field lens, controls laser pulse's transmission through the Q switch of control laser instrument, need not extra device and extra control signal, simple structure, convenient to use has reduced the device cost, uses the controller to change the duration that the Q switch was turn-off, and the number of pulse is suppressed in control, realizes accurate control, eliminates the colour difference that the inhomogeneous power density in scanning line both ends arouses.
Drawings
The technical scheme of the utility model is further explained by combining the attached drawings as follows:
FIG. 1 is a schematic structural view of the uniform line light spot laser cleaning device of the present invention;
fig. 2 is a timing diagram of the synchronous signal control of the uniform line spot laser cleaning device of the present invention.
Wherein: 1. a laser; 101. a Q-switch; 2. a controller; 3. scanning a galvanometer; 4. TTL signals; 5. a Q-switch control signal; 6. a galvanometer control signal; 7. an energy transmission optical fiber; 8. and a field lens.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
The figure 1 shows the utility model discloses even line light spot laser belt cleaning device, including laser instrument 1, scanning galvanometer 3, biography can optic fibre 7, controller 2 and field lens 8.
The laser 1 in this embodiment is a high-energy pulse solid-state laser, and is composed of an oscillator and an amplifier. The gain medium of the laser 1 is a side-pumped NdYAG crystal, and the wavelength of the radiation laser is 1064nm. The oscillator adopts a flat cavity structure, and a Q switch 101 is inserted in the cavity to be used as a device for generating laser pulses. The oscillator amplifies the single pulse energy to the maximum of 150mJ through a cascaded side pumped amplifier, and the peak power is up to 3MW. The high energy and high peak power multimode laser can rapidly vaporize contaminants and cause them to rapidly separate from the substrate without affecting the substrate surface.
The scanning galvanometer 3 is used for reflecting laser generated by the laser 1, and the energy transmission optical fiber 7 transmits the laser emitted by the laser 1 to the scanning galvanometer 3. The laser light generated by the laser 1 is space light, and for flexible and various cleaning, the laser light is generally required to be coupled into the energy transmission optical fiber 7. The energy transmission optical fiber 7 is generally a multimode optical fiber with a large core diameter, the range of the core diameter of the optical fiber is 100um-1000um, and the outer layer is generally a metal package as a protective sleeve. The energy transmission optical fiber 7 transmits laser to the front end of the scanning galvanometer 3, and the laser is collimated and then is irradiated on the mirror surface of the galvanometer.
The controller 2 is used for sending TTL signals 4 and Q switch control signals 5 to the laser 1 and sending galvanometer control signals 6 to the scanning galvanometer 3. As shown in fig. 2, I is a TTL signal 4, and the TTL signal 4 is used to prompt the laser 1 to generate a pulse train, in this example, the TTL signal 4 has a repetition frequency of 10kHz and a duty cycle of 2%, and the resulting laser pulse has a repetition frequency of 10kHz and a pulse width of 50ns. As shown in fig. 2, II is a Q-switch control signal 5,Q, the switch control signal 5 is used to control the operating state of the Q-switch 101, when the Q-switch control signal 5 is at a high level, the Q-switch 101 is in a closed state, and at this time, the laser 1 will not generate a pulse; when the Q-switch control signal 5 is low, the Q-switch 101 is in operation and the laser 1 continues to emit pulses. As shown in figure 2, III is a vibrating mirror control signal 6, the vibrating mirror control signal 6 is a symmetrical triangular wave, the frequency of the triangular wave is 1-100Hz adjustable, and the adjustable range of the amplitude is 0- +/-5V. The TTL signal 4, the Q-switch control signal 5 and the galvanometer control signal 6 are synchronous signals having a fixed phase or an adjustable fixed phase, wherein the frequency of the Q-switch control signal 5 is 2 times the frequency of the galvanometer control signal 6.
The scanning range and scanning frequency of the scanning galvanometer 3 are determined by the frequency and amplitude of the galvanometer control signal 6. Because the galvanometer control signal 6 is linear voltage, the scanning galvanometer 3 can realize uniform scanning light spots in a large range, but because the scanning galvanometer 3 inevitably accelerates and decelerates in the process of reciprocating scanning, particularly for the size of a galvanometer lens with a larger size, the stagnation effect caused by acceleration and deceleration is more obvious, and therefore, the scanning light spots are not uniform at two ends. At this time, the laser pulse at this moment is turned off by the Q-switch control signal 5, so that the acceleration and deceleration process of the scanning galvanometer 3 can be avoided, and the scanning of the rest part is uniform.
The field lens 8 and the scanning galvanometer 3 are arranged in a pair axis to realize the focusing of light beams. The field lens 8 is generally composed of a multi-layer lens, and can enable beams with different incidence angles to have the same focal point and small distortion on an image plane. In this embodiment, the deflection angle of the scanning galvanometer 3 is ± 12 degrees, the focal length of the field lens 8 is 160mm, and the focal length and the scanning distance of the field lens 8 can be changed according to the need of cleaning. The light paths of the scanning galvanometer 3 and the field lens 8 are adjusted to enable the optical axis of the scanning galvanometer 3 to be aligned with the center of the field lens 8, so that the symmetry of scanning light spots can be ensured.
The utility model discloses a control laser instrument 1's Q switch 101 controls laser pulse's transmission, need not extra device and extra control signal, simple structure, and convenient to use uses controller 2 to change the duration that Q switch 101 was turn-offed, and the number of pulse is suppressed in control, realizes accurate control, eliminates the colour difference that the inhomogeneous power density in scanning line both ends arouses.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all utilize the equivalent structure or equivalent flow transformation that the content of the specification does, or directly or indirectly use in other related technical fields, all including in the same way the patent protection scope of the present invention.
Claims (6)
1. The utility model provides a uniform line spot laser belt cleaning device which characterized in that includes:
a laser, in which a Q-switch is arranged, for generating laser pulses;
the scanning galvanometer is used for reflecting laser generated by the laser;
the energy transmission optical fiber transmits the laser emitted by the laser to the scanning galvanometer;
the controller is used for sending a TTL signal and a Q switch control signal to the laser and sending a galvanometer control signal to the scanning galvanometer, wherein the TTL signal is used for prompting the laser to generate a pulse train, the Q switch control signal is used for controlling the working state of the Q switch, the galvanometer control signal is a symmetrical triangular wave, and the TTL signal, the Q switch control signal and the galvanometer control signal are synchronous signals;
and the field lens and the scanning galvanometer are arranged in a counter shaft to realize the focusing of the light beam.
2. The uniform line spot laser cleaning apparatus of claim 1, wherein: the laser is a pulse solid laser.
3. The uniform line spot laser cleaning apparatus of claim 1, wherein: the single pulse energy of the laser is 1mJ-150mJ, and the peak power is 3MW.
4. The uniform line spot laser cleaning apparatus of claim 1, wherein: the repetition frequency of the TTL signal is 10kHz, and the duty ratio is 2%.
5. The uniform line spot laser cleaning apparatus according to claim 1, wherein: the frequency of the Q switch control signal is 2 times of the frequency of the galvanometer control signal.
6. The uniform line spot laser cleaning apparatus of claim 1, wherein: the deflection angle of the scanning galvanometer is +/-12 degrees, and the focal length of the field lens is 160mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221002619.2U CN217528517U (en) | 2022-04-24 | 2022-04-24 | Uniform line light spot laser cleaning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221002619.2U CN217528517U (en) | 2022-04-24 | 2022-04-24 | Uniform line light spot laser cleaning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217528517U true CN217528517U (en) | 2022-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221002619.2U Active CN217528517U (en) | 2022-04-24 | 2022-04-24 | Uniform line light spot laser cleaning device |
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| CN (1) | CN217528517U (en) |
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2022
- 2022-04-24 CN CN202221002619.2U patent/CN217528517U/en active Active
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