CN114324181A - Laser transduction device and control method thereof - Google Patents
Laser transduction device and control method thereof Download PDFInfo
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- CN114324181A CN114324181A CN202111588144.XA CN202111588144A CN114324181A CN 114324181 A CN114324181 A CN 114324181A CN 202111588144 A CN202111588144 A CN 202111588144A CN 114324181 A CN114324181 A CN 114324181A
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Abstract
The present disclosure provides a laser transduction apparatus and a control method thereof, the laser transduction apparatus including a laser generator and a metal excitation target; the laser generator is used for emitting laser to the first surface of the metal excitation target; the first surface of the metal excitation target generates shock waves under the action of laser, and the shock waves form sound waves in the transmission process; wherein the metal excitation target is a positively charged metal structure. The laser transduction device and the control method thereof can effectively reduce the damage of the laser transduction device to the excitation target in the working process, thereby prolonging the service life of the laser transduction device.
Description
Technical Field
The invention relates to the field of laser transducers, in particular to a laser transducer device and a control method thereof.
Background
At present, the laser transducer based on the photoacoustic effect is rapidly developed in the fields of nondestructive testing, imaging and the like by virtue of the advantages of non-contact property, strong anti-interference capability, easiness in miniaturization and arraying.
In the related art, because the peak power of the laser transducer is very high, laser irradiation generates a large amount of heat on the surface of the excitation target, and after the laser transducer works for a period of time, the laser transducer can cause damage to the excitation target to a certain extent, so that the common working life of the laser transducer is not long.
Disclosure of Invention
The embodiment of the disclosure provides a laser transducer device and a control method thereof, which can effectively reduce the damage of a laser transducer to an excitation target in the working process so as to prolong the service life of the laser transducer.
In a first aspect, embodiments of the present disclosure provide a laser transduction apparatus, including: a laser generator and a metal excitation target; the laser generator is used for emitting laser to the first surface of the metal excitation target; the first surface of the metal excitation target generates shock waves under the action of the laser, and the shock waves form sound waves in the transmission process; wherein the metal excitation target is a positively charged metal structure.
In some embodiments, the laser transduction device further includes a transparent confinement layer at the first surface of the metallic excitation target.
In some embodiments, the transparent confinement layer covers a first surface of the metallic excitation target, and a surface of the transparent confinement layer facing the metallic excitation target is in seamless contact with the first surface.
In some embodiments, the transparent constraining layer is transparent glass.
In some embodiments, the transparent constraining layer has a thickness in a range from 0.5mm to 3mm perpendicular to the first surface.
In some embodiments, the metal excitation target has a thickness in a range of 0.5mm to 3mm perpendicular to the first surface.
In some embodiments, the laser generator is a solid state pulsed laser.
In some embodiments, the laser transduction apparatus further includes a signal generator for providing timing signals of different frequencies to the laser generator to control the laser generator to output the laser light of different repetition frequencies, wherein each frequency of timing signals corresponds to one repetition frequency of the laser light.
In some embodiments, the laser transduction apparatus further includes a control unit for adjusting a frequency of the timing signal provided by the signal generator, and adjusting an operating current and/or an operating voltage of the laser generator.
In some embodiments, the laser transducer device further includes a laser beam expanding and focusing circuit disposed between the laser generator and the metal excitation target, and the laser output by the laser generator is expanded and focused by the laser beam expanding and focusing circuit and then transmitted to the first surface of the metal excitation target.
In some embodiments, the laser beam expanding and focusing circuitry comprises an expander lens, a focusing lens, and a mirror; the laser output by the laser generator is transmitted to the focusing lens after being expanded by the beam expanding lens, is output to the reflecting mirror after being focused by the focusing lens, and is reflected to the first surface of the metal excitation target by the reflecting mirror.
In a second aspect, embodiments of the present disclosure provide a method of controlling a laser transduction apparatus including a laser generator and a metal excitation target; the control method comprises the following steps: applying a positive electrode voltage to the metal-excited target to positively charge the metal-excited target; and controlling the laser generator to emit laser to the first surface of the metal excitation target, wherein the first surface of the metal excitation target generates shock waves under the action of the laser, and the shock waves form sound waves in the transmission process.
According to the technical scheme of the laser transduction device and the control method thereof, after the first surface of the metal excitation target receives laser output by the laser generator, nuclear electrons of metal atoms on the surface of the metal excitation target are ionized to form metal plasma with positive electricity due to the fact that the nuclear electrons absorb laser energy and escape from the constraint of atomic nuclei, and the metal plasma moves disorderly due to the strong repulsion effect between the nuclear electrons and the atomic electrons, a large amount of heat is generated, the metal plasma expands and explodes rapidly, and therefore shock waves are generated on the first surface of the metal excitation target. The positively charged metal structure can improve the constraint on the extra-nuclear electrons through coulomb force action, so that the extra-nuclear electrons of metal atoms are difficult to escape from the constraint of atomic nuclei after absorbing laser energy, thereby reducing the existence time of metal plasmas, reducing the irregular thermal motion effect among the metal plasmas, reducing the heat generated by the thermal motion of the metal plasmas, further effectively improving the damage to the metal excitation target, playing a role in protecting the metal excitation target, and effectively prolonging the service life of the laser energy conversion device.
Drawings
Fig. 1 is a schematic structural diagram of a laser transduction apparatus according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating an operating principle of a laser transducing device according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a control method of a laser transduction apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the embodiments of the present disclosure, the laser transduction apparatus and the control method thereof provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, but which may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements/structures, these elements/structures should not be limited by these terms. These terms are only used to distinguish one element/structure from another element/structure.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In the related art, because the peak power of the laser transducer is very high, laser irradiation generates a large amount of heat on the surface of the excitation target, and after the laser transducer works for a period of time, the laser transducer can cause damage to the excitation target to a certain extent, so that the common working life of the laser transducer is not long.
To this end, the disclosed embodiment proposes a laser transduction device, fig. 1 is a schematic structural diagram of a laser transduction device provided by the disclosed embodiment, and as shown in fig. 1, the disclosed embodiment provides a laser transduction device including a laser generator 3 and a metal excitation target 71.
Wherein the laser generator 3 is configured to emit laser light to the first surface M of the metal excitation target 71; the first surface M of the metal excitation target 71 generates shock waves under the action of laser, and the shock waves form sound waves in the transmission process; the metal excitation target 71 is a positively charged metal structure.
In the embodiment of the present disclosure, after the first surface M of the metal excitation target 71 receives the laser output by the laser generator 3, the extra-nuclear electrons of the metal atoms on the surface of the metal excitation target 71 are ionized to form a positively charged metal plasma due to the constraint of escape nuclei by absorbing the laser energy, and due to the strong repulsion between the electrons and the electrons, the metal plasma generates a chaotic motion, generates a large amount of heat and rapidly expands and explodes, thereby generating an excitation wave on the first surface M of the metal excitation target 71. The positively charged metal structure can improve the constraint on the extra-nuclear electrons through coulomb force action, so that the extra-nuclear electrons of metal atoms are difficult to escape from the constraint of atomic nuclei after absorbing laser energy, thereby reducing the existence time of metal plasmas, reducing the irregular thermal motion effect among the metal plasmas, reducing the heat generated by the thermal motion of the metal plasmas, further effectively improving the damage of laser irradiation on the metal excitation target 71, playing a role in protecting the metal excitation target 71, and effectively prolonging the service life of the laser transduction device.
In some embodiments, the laser generator 3 is a solid-state pulsed laser for emitting pulsed laser light. Illustratively, the solid-state pulse laser may employ a solid-state pulse laser having a high repetition rate, for example, a neodymium-doped yttrium aluminum garnet (Nd: YAG) solid-state pulse laser. And (3) emitting pulse laser with high repetition frequency to the surface of the metal excitation target 71 by adopting a high repetition frequency solid pulse laser to generate required continuous sound waves, wherein the repetition frequency of the pulse laser output by the solid pulse laser is adjustable, and the frequency of the continuous sound waves generated by the laser energy conversion device can be changed by adjusting the repetition frequency of the pulse laser output by the solid pulse laser.
In some embodiments, the wavelength of the pulsed laser output by the solid-state pulsed laser may range from 500 nanometers (nm) to 1064 nanometers (nm), the pulse width may range from 1 picosecond (ps) to 50 picoseconds (ps), the single pulse energy may range from 1 μ J to 500 μ J, and the repetition rate may range from 1Hz to 1 MHz.
Illustratively, the pulsed laser has a wavelength of 532 nm, a pulse width of 15ps, a single pulse energy of 100 μ J, a repetition rate of any value between 1Hz and 200kHz, and the repetition rate is adjustable.
In some embodiments, the operating current of the solid-state pulse laser may be any value between 0A and 60A (including 60A), and the operating current of the solid-state pulse laser is adjustable.
In some embodiments, the operating voltage of the solid-state pulse laser may be any value between 0V and 10V (including 10V), and the operating voltage of the solid-state pulse laser is adjustable.
In some embodiments, as shown in fig. 1, the laser transduction apparatus further includes a signal generator 2, the signal generator 2 is connected to the laser generator 3, the signal generator 2 is configured to provide timing signals with different frequencies to the laser generator 3 to control the laser generator 3 to output laser lights with different repetition frequencies, wherein the timing signals with different frequencies correspond to the laser lights with different repetition frequencies, and the timing signals may be sine wave signals. In some embodiments, the frequency of the timing signal provided by the signal generator 2 corresponds to the repetition frequency of the laser light output by the laser generator 3. The laser generator 3 may be supplied with a timing signal of a desired frequency by the signal generator 2 to control the laser generator 3 to output laser light of a desired repetition frequency.
In some embodiments, the frequency range of the timing signal may be 1Hz to 200kHz, the frequency of the timing signal may be any value between 1Hz and 200kHz, and the frequency of the timing signal may be adjustable.
In some embodiments, the laser transduction apparatus further includes a control unit 1, the control unit 1 is connected to the signal generator 2 and to the laser generator 3, and the control unit 1 is configured to adjust a frequency of the timing signal provided by the signal generator 2 and adjust an operating current and/or an operating voltage of the laser generator 3.
Wherein, the control unit 1 adjusts the frequency of the timing signal provided by the signal generator 2 to the laser generator 3, so that the laser generator 3 generates laser light with a required repetition frequency. The control unit 1 changes the power of the laser generator 3 by adjusting the operating current and/or operating voltage of the laser generator 3, thereby changing the energy of the output single-pulse laser. In practical applications, a pulse laser focused on the metal excitation target 71 can generate a pulse acoustic wave, and the amplitude of the pulse acoustic wave is in positive correlation with the energy of the single pulse laser, so that changing the energy of the single pulse laser output by the laser generator 3 can adjust the amplitude of the acoustic wave generated by the laser transducer.
In some embodiments, the laser transducer device further includes a laser beam expanding and focusing circuit disposed between the laser generator 3 and the metal excitation target 71, and the laser output by the laser generator 3 is expanded and focused by the laser beam expanding and focusing circuit and then transmitted to the first surface M of the metal excitation target 71. The laser beam output by the laser generator 3 is expanded and focused by the laser beam expanding and focusing circuit and then is transmitted to the metal excitation target 71, so that the optical power density of the focusing focus S irradiated on the surface of the metal excitation target by the laser can be effectively improved, and the metal excitation target 71 can generate required sound waves based on a plasma mechanism of a photoacoustic effect.
In some embodiments, as shown in fig. 1, the laser beam expanding and focusing circuit includes a beam expanding lens 4, a focusing lens 5 and a reflecting mirror 6, and the laser output by the laser generator 3 is expanded by the beam expanding lens 4 and then transmitted to the focusing lens 5, and is focused by the focusing lens 5 and then output to the reflecting mirror 6, and is reflected by the reflecting mirror 6 to the first surface M of the metal excitation target 71.
Specifically, the beam expanding lens 4 is disposed at an output end of the laser generator 3, and is configured to receive the laser output by the laser generator 3 and perform beam expanding processing; the focusing lens 5 is arranged on one side of the beam expanding lens 4 far away from the laser generator 3 and is used for receiving the laser output by the beam expanding lens 4 and carrying out focusing treatment; the reflecting mirror 6 is disposed on a side of the focusing lens 5 away from the beam expanding lens 4, and is configured to reflect the laser light output through the focusing lens 5 to the first surface M of the metal excitation target 71 below.
In some embodiments, the magnification of the beam expanding lens 4 may range from 3 times to 5 times, which may ensure the beam expanding effect on the laser output by the laser generator 3, so as to effectively increase the optical power density of the focused focal point S transmitted by the laser to the first surface M of the metal excitation target 71.
In some embodiments, the focal length of the focusing lens 5 may range from 100 mm to 500 mm, which may ensure a focusing effect on the laser light to effectively increase the optical power density of the laser light transmitted to the focused focal point S on the first surface M of the metal excitation target 71. In some embodiments, the focusing lens 5 may be an aspheric focusing lens.
In some embodiments, an angle between the light reflecting surface of the reflecting mirror 6 disposed toward the focusing lens 5 and the first surface M of the underlying metal excitation target 71 is 45 °, so that the laser light output by the focusing lens 5 is reflected by the reflecting mirror 6 and then is incident on the first surface M at an angle perpendicular or approximately perpendicular to the first surface M, so as to improve the optical power density of the focused focal point S of the laser light transmitted to the first surface M of the metal excitation target 71. In some embodiments, the mirror 6 is a flat mirror.
The focusing focus S is an optical focusing focus S formed by the expanded and focused laser on the first surface M of the metal excitation target 71.
In some embodiments, the laser beam diameter of the laser output by the laser generator 3 may range from 1 mm to 4 mm, for example, the laser beam diameter of the laser output by the laser generator 3 is 2.5 mm. Through the beam expanding and focusing action of the laser beam expanding and focusing optical path, the diameter of a laser spot can be focused to 4-16 microns, for example, the diameter of the laser spot is 10 microns through the beam expanding and focusing action of the laser beam expanding and focusing optical path. The beam expanding lens 4 is used for increasing the beam diameter of the laser, and the focusing lens 5 is used for reducing the beam diameter of the laser.
In some embodiments, as shown in fig. 1, the laser transduction apparatus further includes a transparent confinement layer 72, the transparent confinement layer 72 is located on the first surface M of the metal excitation target 71, the transparent confinement layer 72 covers the first surface M of the metal excitation target 71, and the surface of the transparent confinement layer 72 facing the metal excitation target 71 is in seamless contact with the first surface M, i.e., the surface of the transparent confinement layer 72 facing the metal excitation target 71 is closely attached to the first surface M of the metal excitation target 71.
The transparent constraint layer 71 can be used for blocking the extranuclear electrons of the metal atoms on the first surface M of the metal excitation target 71 from escaping, so that the thermal motion effect of plasma generated by the action of laser on the surface M of the metal excitation target 71 is effectively reduced, the heat generated by the surface M of the metal excitation target 71 is reduced, the damage to the metal excitation target 71 caused by laser irradiation is effectively improved, the effect of protecting the metal excitation target 71 can be achieved, the service life of the laser energy conversion device is effectively prolonged, and the transparent constraint layer 72 is in seamless contact with the first surface M towards the surface of the metal excitation target 71, so that the surface oxidation corrosion of the metal excitation target 71 caused by air entering can be effectively prevented.
In some embodiments, a metal film may be formed on the surface of the transparent confinement layer 72 as the metal excitation target 71, so as to ensure seamless connection and contact between the surface of the transparent confinement layer 72 facing the metal excitation target 71 and the first surface M.
In some embodiments, transparent constraining layer 72 may be formed of a transparent material with high insulation, high temperature resistance, and certain hardness. Illustratively, the transparent constraining layer 72 may be a transparent glass, such as a transparent quartz glass.
In some embodiments, the thickness of transparent constraining layer 72 along a direction perpendicular to first surface M may range from 0.5 millimeters (mm) to 3 millimeters (mm), for example, the thickness of transparent constraining layer 72 along a direction perpendicular to first surface M may be set to 1 millimeter (mm).
In some embodiments, the metallic excitation target 71 may be composed of a metallic material, such as copper, aluminum, steel, and the like.
In some embodiments, the thickness of metal excitation target 71 along a direction perpendicular to first surface M may range from 0.5 millimeters (mm) to 3 millimeters (mm), for example, the thickness of metal excitation target 71 along a direction perpendicular to first surface M may be set to 1 mm.
In some embodiments, the thickness of metallic excitation target 71 along a direction perpendicular to first surface M is the same as the thickness of transparent confinement layer 72 along a direction perpendicular to first surface M.
In some embodiments, metallic excitation target 71 is the same shape and size as transparent confinement layer 72.
Illustratively, the shape of metal excitation target 71 may be a disk, and the diameter of metal excitation target 71 may range from 10 millimeters (mm) to 100 mm, such as metal excitation target 71 having a diameter of 60 mm.
Illustratively, the transparent constraining layer 72 may be in the shape of a circular sheet, and the diameter of the transparent constraining layer 72 may range from 10 millimeters (mm) to 100 mm, for example, the diameter of the transparent constraining layer 72 is 60 mm.
Fig. 2 is a schematic diagram illustrating an operating principle of a laser transducer device according to an embodiment of the present disclosure, and the operating principle of the laser transducer device according to the embodiment of the present disclosure is described in detail with reference to fig. 1 and 2.
As shown in fig. 1 and fig. 2, the laser generator 3 outputs a pulse laser with adjustable repetition frequency and adjustable single pulse energy, the pulse laser is expanded and focused by the laser beam expanding and focusing optical paths (4, 5, 6), the focused pulse laser 8 passes through the transparent confinement layer 72 and irradiates the first surface M of the metal excitation target 71, electrons outside the atomic nucleus of the metal excitation target 71 escape from the atomic nucleus bound by the absorbed laser energy and are ionized to form a positively charged metal plasma at the focal point S, the metal plasma at the focal point S generates a chaotic motion due to the strong repulsion between the metal plasmas, generates a large amount of heat and rapidly expands and explodes, forms an instantaneous explosion gasification area 9 at the focal point S on the surface of the metal excitation target 71, and instantaneously vaporizes and explodes in the instantaneous explosion gasification area 9 to generate an excitation wave 10, because the rigidity of the metal excitation target 71 is far greater than the rigidity of the transparent confinement layer 72, most of the energy of the shock wave 10 enters the transparent confinement layer 72 and is attenuated to the acoustic wave 11 after traveling a distance in the transparent confinement layer 72.
On the one hand, the transparent confinement layer 72 can effectively block electrons from escaping the metal atoms, and on the other hand, a positive electrode voltage is applied to the metal excitation target 71, so that the metal excitation target 71 is positively charged, the extra-nuclear electrons (negatively charged) of the metal atoms are bound through the action of coulomb force, and after the extra-nuclear electrons of the metal atoms absorb laser energy, it is difficult to escape the atomic nucleus binding, at this time, the pulse laser 8 is irradiated on the metal excitation target 71, metal plasma is excited at the focus S to generate a shock wave 10, but since extra-nuclear electrons of metal atoms are bound, so that the time during which the metal plasma exists is shortened, the effect of irregular thermal motion of the metal plasmas among each other is weakened, the amount of heat generated thereby is greatly reduced, therefore, the function of protecting the metal excitation target 71 can be achieved, and the working time (service life) of the laser energy conversion device is effectively prolonged. The magnitude of the positive voltage applied to metal excitation target 71 is adjustable within a certain range, and the positive potential of metal excitation target 71 is in the range of hundreds of volts (V) to kilovolts (V), for example.
According to the technical scheme of the laser transduction device provided by the embodiment of the disclosure, based on a surface constraint mechanism in the photoacoustic effect, the metal excitation target of the laser transduction device is modified, and a positive electrode voltage is applied to the metal excitation target, so that the metal excitation target is positively charged, the heat generation of the metal excitation target can be effectively reduced in the working process of the laser transduction device, the damage caused by laser irradiation to the metal excitation target is further reduced, the purpose of effectively prolonging the working life of the laser transduction device is realized, the manufacturing processes of the transparent constraint layer and the metal excitation target are simple, the process requirement is lower, the system stability is strong, and the feasibility is high.
Fig. 3 is a schematic flow chart of a control method of a laser transduction apparatus according to an embodiment of the present disclosure, and as shown in fig. 3, an embodiment of the present disclosure further provides a control method of a laser transduction apparatus, where the laser transduction apparatus may adopt the laser transduction apparatus provided in any of the above embodiments, and the control method includes the following steps:
step S1, a positive electrode voltage is applied to the metal excitation target to positively charge the metal excitation target.
And step S2, controlling the laser generator to emit laser to the first surface of the metal excitation target, wherein the first surface of the metal excitation target generates shock waves under the action of the laser, and the shock waves form sound waves in the transmission process.
It should be noted that, in the embodiment of the present disclosure, the execution sequence of the above steps S1 and S2 is not limited to executing step S2 after executing step S1, and in some embodiments, the execution sequence of the above steps S1 and S2 may also be executing step S1 after executing step S2.
In some embodiments, the control method may further include: and adjusting the repetition frequency of the laser output by the laser generator. For the way of adjusting the repetition frequency of the laser output by the laser generator, reference may be made to the description in the above embodiments, and details are not repeated here.
In some embodiments, the control method may further include: and adjusting the energy of the single pulse laser output by the laser generator. For the way of adjusting the energy of the single-pulse laser output by the laser generator, reference may be made to the description in the above embodiments, and details are not repeated here.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present disclosure, and that the present disclosure is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the disclosure, and these are to be considered as the scope of the disclosure.
Claims (12)
1. A laser transduction device is characterized by comprising a laser generator and a metal excitation target;
the laser generator is used for emitting laser to the first surface of the metal excitation target;
the first surface of the metal excitation target generates shock waves under the action of the laser, and the shock waves form sound waves in the transmission process; wherein the metal excitation target is a positively charged metal structure.
2. The laser transduction device according to claim 1, further comprising a transparent confinement layer on the first surface of the metal excitation target.
3. The laser transduction device of claim 2, wherein the transparent confinement layer covers a first surface of the metallic excitation target, and a surface of the transparent confinement layer facing the metallic excitation target is in seamless contact with the first surface.
4. The laser transduction device according to claim 2, wherein the transparent constraining layer is a transparent glass.
5. The laser transduction device of claim 2, wherein the transparent constraining layer has a thickness in a range of 0.5mm to 3mm perpendicular to the first surface.
6. The laser transduction device of claim 1, wherein the thickness of the metal excitation target perpendicular to the first surface ranges from 0.5mm to 3 mm.
7. The laser transducer device of claim 1, wherein the laser generator is a solid-state pulsed laser.
8. The laser transducer device of claim 1, further comprising a signal generator for providing timing signals of different frequencies to the laser generator to control the laser generator to output the laser light of different repetition frequencies, wherein each frequency of timing signals corresponds to one repetition frequency of the laser light.
9. The laser transduction device according to claim 8, further comprising a control unit for adjusting a frequency of the timing signal provided by the signal generator and adjusting an operating current and/or an operating voltage of the laser generator.
10. The laser transducer device of claim 1, further comprising a laser beam expanding and focusing circuit disposed between the laser generator and the metal excitation target, wherein the laser beam output by the laser generator is expanded and focused by the laser beam expanding and focusing circuit and then transmitted to the first surface of the metal excitation target.
11. The laser transducer device according to claim 10, wherein the laser beam expanding and focusing circuit comprises a beam expanding lens, a focusing lens and a reflector;
the laser output by the laser generator is transmitted to the focusing lens after being expanded by the beam expanding lens, is output to the reflecting mirror after being focused by the focusing lens, and is reflected to the first surface of the metal excitation target by the reflecting mirror.
12. The control method of the laser transduction device is characterized in that the laser transduction device comprises a laser generator and a metal excitation target; the control method comprises the following steps:
applying a positive electrode voltage to the metal-excited target to positively charge the metal-excited target;
and controlling the laser generator to emit laser to the first surface of the metal excitation target, wherein the first surface of the metal excitation target generates shock waves under the action of the laser, and the shock waves form sound waves in the transmission process.
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