CN114324181B - Laser transduction device and control method thereof - Google Patents
Laser transduction device and control method thereof Download PDFInfo
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- CN114324181B CN114324181B CN202111588144.XA CN202111588144A CN114324181B CN 114324181 B CN114324181 B CN 114324181B CN 202111588144 A CN202111588144 A CN 202111588144A CN 114324181 B CN114324181 B CN 114324181B
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Abstract
The present disclosure provides a laser transduction apparatus including a laser generator and a metal excitation target, and a control method thereof; 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 of 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 transduction device and a control method thereof.
Background
At present, a laser transducer based on the photoacoustic effect rapidly develops in the fields of nondestructive detection, 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, as the peak power of the laser transducer is very high, a great amount of heat is generated on the surface of the excitation target by laser irradiation, and the laser transducer can cause a certain degree of damage to the excitation target after working for a period of time, so that the general working life of the laser transducer is not long.
Disclosure of Invention
The embodiment of the disclosure provides a laser transduction device and a control method thereof, which can effectively reduce damage to an excitation target caused by a laser transducer in a 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 of a positively charged metal structure.
In some embodiments, the laser transduction device further comprises a transparent confinement layer located at the first surface of the metal excitation target.
In some embodiments, the transparent constraining layer covers the first surface of the metal excitation target, and the surface of the transparent constraining layer facing the metal excitation target is in seamless contact with the first surface.
In some embodiments, the transparent constraining layer is transparent glass.
In some embodiments, the thickness of the transparent constraining layer along a direction perpendicular to the first surface ranges from 0.5mm to 3mm.
In some embodiments, the thickness of the metal excitation target along a direction perpendicular to the first surface ranges from 0.5mm to 3mm.
In some embodiments, the laser generator is a solid-state pulsed laser.
In some embodiments, the laser transduction device further comprises 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 the timing signal of each frequency corresponds to the laser light of one repetition frequency.
In some embodiments, the laser transduction device further comprises a control unit for adjusting the frequency of the timing signal provided by the signal generator and adjusting the operating current and/or the operating voltage of the laser generator.
In some embodiments, the laser transduction device further comprises a laser beam expanding and focusing circuit arranged between the laser generator and the metal excitation target, and the laser beam output by the laser generator is transmitted to the first surface of the metal excitation target after being expanded and focused by the laser beam expanding and focusing circuit.
In some embodiments, the laser beam expanding and focusing circuit includes a beam expanding 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 excitation target to positively charge the metal excitation 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.
In the technical scheme of the laser transduction device and the control method thereof provided by the embodiment of the disclosure, after the first surface of the metal excitation target receives the laser output by the laser generator, the extra-nuclear electrons of the metal atoms on the surface of the metal excitation target are ionized to form positively charged metal plasmas due to the constraint of the escape atomic nuclei of the absorbed laser energy, and the metal plasmas are subjected to disordered movement due to the strong repulsive interaction, so that a large amount of heat is generated and rapidly expand and explode outwards, and shock waves are generated on the first surface of the metal excitation target. The positively charged metal structure can improve the binding of extra-nuclear electrons through the coulomb force, so that after the extra-nuclear electrons of metal atoms absorb laser energy, the extra-nuclear electrons are difficult to escape from the binding of atomic nuclei, thereby reducing the time of existence of metal plasmas, reducing the irregular thermal motion effect between the metal plasmas, reducing the heat generated by the thermal motion of the metal plasmas, further effectively improving the damage to a metal excitation target, playing a role in protecting the metal excitation target, and effectively prolonging the service life of the laser transduction 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 of an operating principle of a laser transduction apparatus according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating a control method of a laser transduction apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the following describes in detail the laser transduction apparatus and the control method thereof provided in the embodiments of the present disclosure with reference to the accompanying drawings.
Example embodiments will be described more fully hereinafter with reference to the accompanying drawings, but may be embodied in various 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, as the peak power of the laser transducer is very high, a great amount of heat is generated on the surface of the excitation target by laser irradiation, and the laser transducer can cause a certain degree of damage to the excitation target after working for a period of time, so that the general working life of the laser transducer is not long.
To this end, an embodiment of the present disclosure proposes a laser transduction device, and fig. 1 is a schematic structural diagram of a laser transduction device provided in an embodiment of the present disclosure, and as shown in fig. 1, the embodiment of the present disclosure provides a laser transduction device, which includes a laser generator 3 and a metal excitation target 71.
Wherein the laser generator 3 is for emitting 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; wherein 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 light 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 positively charged metal plasma due to the constraint of the nuclei escaping from the absorption laser energy, and the metal plasma is subjected to random movement due to strong repulsive interaction, so that a large amount of heat is generated and rapidly expands and explodes, thereby generating shock waves on the first surface M of the metal excitation target 71. The positively charged metal structure can improve the binding of extra-nuclear electrons through the coulomb force, so that after the extra-nuclear electrons of metal atoms absorb laser energy, the extra-nuclear electrons are difficult to escape from the binding of atomic nuclei, thereby reducing the time for existence of metal plasmas, reducing the irregular thermal motion effect between the metal plasmas, reducing the heat generated by the thermal motion of the metal plasmas, further effectively improving the damage of laser irradiation to the metal excitation target 71, 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 pulse laser for emitting pulsed laser light. By way of example, a solid-state pulse laser may be employed that has a high repetition rate, such as a neodymium-doped yttrium aluminum garnet (Nd: YAG) solid-state pulse laser. The high repetition frequency solid pulse laser is adopted to emit pulse laser with high repetition frequency to the surface of the metal excitation target 71 so as to generate a required continuous sound wave, wherein the repetition frequency of the pulse laser output by the solid pulse laser is adjustable, and the frequency of the continuous sound wave generated by the laser transduction device can be changed by adjusting the repetition frequency of the pulse laser output by the solid pulse laser.
In some embodiments, the pulsed laser output by the solid-state pulsed laser may have a wavelength in the range of 500 nanometers (nm) to 1064 nanometers (nm), a pulse width in the range of 1 picosecond (ps) to 50 picoseconds (ps), a single pulse energy in the range of 1 μj to 500 μj, and a repetition rate in the range of 1Hz to 1MHz.
By way of example, the pulsed laser has a wavelength of 532 nanometers, a pulse width of 15ps, a single pulse energy of 100 μJ, 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 anywhere 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 anywhere 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, where the signal generator 2 is connected to the laser generator 3, and 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 light with different repetition frequencies, where the timing signal with each frequency corresponds to the laser light with one repetition frequency, and where the timing signal may be a sine wave signal. In some embodiments, the frequency of the timing signal provided by the signal generator 2 coincides with the repetition frequency of the laser light output by the laser generator 3. The timing signal of a desired frequency can be supplied to the laser generator 3 by the signal generator 2 to control the laser generator 3 to output the laser light of a desired repetition frequency.
In some embodiments, the frequency of the timing signal may be in the range of 1Hz to 200kHz, the frequency of the timing signal is any value between 1Hz to 200kHz, and the frequency of the timing signal is adjustable.
In some embodiments, the laser transduction device further comprises 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 the frequency of the timing signal provided by the signal generator 2, and to adjust the operating current and/or the operating voltage of the laser generator 3.
Wherein the control unit 1 causes the laser generator 3 to generate laser light of a desired repetition frequency by adjusting the frequency of the timing signal supplied from the signal generator 2 to the laser generator 3. The control unit 1 changes the power of the laser generator 3 by adjusting the operating current and/or the operating voltage of the laser generator 3, thereby changing the energy of the output single pulse laser light. In practice, a pulsed laser focused on the metal excitation target 71 may generate a pulsed acoustic wave, where the amplitude of the pulsed acoustic wave is positively correlated with the energy of the single-pulse laser, so that changing the energy of the single-pulse laser output by the laser generator 3 may adjust the amplitude of the acoustic wave generated by the laser transduction device.
In some embodiments, the laser transduction 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 beam output from the laser generator 3 is transmitted to the first surface M of the metal excitation target 71 after being expanded and focused by the laser beam expanding and focusing circuit. The laser beam expansion and focusing circuit expands and focuses the laser beam output by the laser generator 3 and then transmits the laser beam to the metal excitation target 71, so that the optical power density of the focusing focus S of the laser irradiated on the surface of the metal excitation target 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 beam output by the laser generator 3 is transmitted to the focusing lens 5 after being expanded by the beam expanding lens 4, and is output to the reflecting mirror 6 after being focused by the focusing lens 5, and is reflected to the first surface M of the metal excitation target 71 by the reflecting mirror 6.
Specifically, the beam expanding lens 4 is disposed at the output end of the laser generator 3, and is configured to receive the laser light output by the laser generator 3 and perform beam expanding processing; the focusing lens 5 is disposed on a side of the beam expanding lens 4 away from the laser generator 3, and is configured to receive the laser light output through the beam expanding lens 4 and perform focusing processing; the reflecting mirror 6 is provided on a side of the focusing lens 5 away from the beam expanding lens 4 for reflecting the laser light output via the focusing lens 5 to the first surface M of the underlying metal excitation target 71.
In some embodiments, the magnification of the beam expander lens 4 may be in the range of 3 to 5 times, and the beam expander effect of the laser light output from the laser generator 3 may be ensured, so as to effectively increase the optical power density of the laser light transmitted to the focusing focus S on 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, and the focusing effect on the laser light may be ensured to effectively increase the optical power density of the laser light transmitted to the focusing focus S on the first surface M of the metal excitation target 71. In some embodiments, the focusing lens 5 may be an aspherical focusing lens.
In some embodiments, the angle between the reflective surface of the reflecting mirror 6 disposed towards the focusing lens 5 and the first surface M of the metal excitation target 71 below is 45 °, so that the laser light output through the focusing lens 5 is reflected by the reflecting mirror 6 and then enters the first surface M at an angle perpendicular or approximately perpendicular to the first surface M, so as to increase 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 planar mirror.
The focusing point S is an optical focusing point S formed on the first surface M of the metal excitation target 71 by the laser light that is expanded and focused.
In some embodiments, the beam diameter of the laser light output from the laser generator 3 may range from 1 mm to 4 mm, for example, the beam diameter of the laser light output from the laser generator 3 is 2.5 mm. The spot diameter of the laser can be focused to 4 to 16 microns by the beam expanding and focusing action of the laser beam expanding and focusing optical path, for example, the spot diameter of the laser is 10 microns by the beam expanding and focusing action of the laser beam expanding and focusing optical path. Wherein the beam expander 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 device further includes a transparent constraining layer 72, the transparent constraining layer 72 is located on the first surface M of the metal excitation target 71, the transparent constraining layer 72 covers the first surface M of the metal excitation target 71, and the surface of the transparent constraining layer 72 facing the metal excitation target 71 is in seamless contact with the first surface M, that is, the surface of the transparent constraining layer 72 facing the metal excitation target 71 is closely adhered to the first surface M of the metal excitation target 71.
The transparent constraint layer 71 can be used for blocking the nuclear 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 laser action 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 of laser irradiation to the metal excitation target 71 is effectively improved, the metal excitation target 71 can be protected, the service life of the laser transduction device is effectively prolonged, and the surface of the transparent constraint layer 72 facing the metal excitation target 71 is in seamless contact with the first surface M, so that the surface oxidation corrosion of air to the metal excitation target 71 can be effectively prevented.
In some embodiments, the metal film may be formed by coating a surface of the transparent constraining layer 72 as the metal excitation target 71, so that a seamless connection contact between the surface of the transparent constraining layer 72 facing the metal excitation target 71 and the first surface M may be ensured.
In some embodiments, the transparent constraining layer 72 may be formed from a highly insulating, high temperature resistant, transparent material having a certain hardness. By way of example, the transparent constraining layer 72 may be a transparent glass, such as a transparent quartz glass.
In some embodiments, the thickness of the transparent constraining layer 72 along a direction perpendicular to the first surface M may range from 0.5 millimeters (mm) to 3 millimeters (mm), for example, the thickness of the transparent constraining layer 72 along a direction perpendicular to the first surface M may be set to 1 millimeter (mm).
In some embodiments, the metal excitation target 71 may be composed of a metal material, which may be, for example, a metal material such as copper, aluminum, steel, or the like.
In some embodiments, the thickness of the metal excitation target 71 along a direction perpendicular to the first surface M may range from 0.5 millimeters (mm) to 3 millimeters (mm), for example, the thickness of the metal excitation target 71 along a direction perpendicular to the first surface M may be set to 1 millimeter.
In some embodiments, the thickness of the metal excitation target 71 along perpendicular to the first surface M is the same as the thickness of the transparent confinement layer 72 along perpendicular to the first surface M.
In some embodiments, the metallic excitation target 71 is the same shape and size as the transparent confinement layer 72.
By way of example, the shape of the metal excitation target 71 may be disk-like, and the diameter of the metal excitation target 71 may range from 10 millimeters (mm) to 100 millimeters (mm), for example, the diameter of the metal excitation target 71 is 60 millimeters (mm).
By way of example, the transparent constraining layer 72 may be wafer-like in shape, and the transparent constraining layer 72 may range in diameter from 10 millimeters (mm) to 100 millimeters (mm), for example, the transparent constraining layer 72 may have a diameter of 60 millimeters (mm).
Fig. 2 is a schematic diagram of an operation principle of a laser transduction device according to an embodiment of the present disclosure, and the operation principle of the laser transduction device according to the embodiment of the present disclosure is described in detail below with reference to fig. 1 and fig. 2.
As shown in fig. 1 and 2, the laser generator 3 outputs pulse laser with adjustable repetition frequency and adjustable single pulse energy, the laser beam is expanded and focused by the laser beam expanding and focusing optical paths (4, 5 and 6), the focused pulse laser 8 passes through the transparent constraint layer 72, irradiates the first surface M of the metal excitation target 71, the nuclear electrons of the metal excitation target 71 escape from the constraint of atomic nuclei due to absorption of laser energy and ionize, positively charged metal plasma is formed at the focal point S, the metal plasma at the focal point S performs random movement due to strong repulsive interaction among the metal plasma, a great amount of heat is generated and rapidly expands and explodes outwards, an instantaneous explosion gasification zone 9 is formed at the focal point S of the surface of the metal excitation target 71, and the instantaneous explosion gasification zone 9 generates shock waves 10, most of the energy of the shock waves 10 enter the transparent constraint layer 72 due to the rigidity of the metal excitation target 71 being far greater than that of the transparent constraint layer 72, and the sound waves attenuate to 11 after being transmitted a certain distance in the transparent constraint layer 72.
On the one hand, the transparent confinement layer 72 can effectively block electrons from escaping metal atoms, on the other hand, positive electrode voltage is applied to the metal excitation target 71, so that the metal excitation target 71 is positively charged, extra-nuclear electrons (negatively charged) of the metal atoms are bound by coulomb force, after the extra-nuclear electrons of the metal atoms absorb laser energy, the extra-nuclear electrons of the metal atoms are difficult to escape atomic nucleus binding, at this time, the pulse laser 8 irradiates the metal excitation target 71, and metal plasma is excited at the focus S to generate shock waves 10, but because the extra-nuclear electrons of the metal atoms are bound, the time of existence of the metal plasma is shortened, the irregular thermal motion effect of the metal plasma among each other is weakened, the generated heat is greatly reduced, and the effect of protecting the metal excitation target 71 is played, so that the working time (service life) of the laser energy conversion device is effectively prolonged. Wherein the magnitude of the positive electrode voltage applied across the metal excitation target 71 is adjustable within a range, and exemplary positive potentials of the metal excitation target 71 are in the range of between hundred volts (V) and kilovolts (V).
According to the technical scheme of the laser transduction device provided by the embodiment of the disclosure, the metal excitation target of the laser transduction device is modified based on a surface constraint mechanism in a photoacoustic effect, positive electrode voltage is applied to the metal excitation target, so that the metal excitation target is positively charged, heating of the metal excitation target can be effectively reduced in the working process of the laser transduction device, damage to the metal excitation target caused by laser irradiation is further reduced, the purpose of effectively prolonging the working life of the laser transduction device is achieved, the manufacturing process of the transparent constraint layer and the metal excitation target is simple, the process requirement is low, the system stability is high, and the feasibility is high.
Fig. 3 is a schematic flow chart of a control method of a laser transduction device according to an embodiment of the present disclosure, and as shown in fig. 3, the embodiment of the present disclosure further provides a control method of a laser transduction device, where the laser transduction device may adopt the laser transduction device provided in any one of the foregoing embodiments, and the control method includes the following steps:
step S1, applying positive electrode voltage to the metal excitation target to make the metal excitation target positively charged.
And S2, controlling a 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 disclosure, the execution sequence of the step S1 and the step S2 is not limited to executing the step S1 first and then executing the step S2, and in some embodiments, the execution sequence of the step S1 and the step S2 may also be that the step S1 is executed after the step S2 is executed.
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 to adjust the repetition frequency of the laser light output by the laser light generator, reference is made to the description related to the above embodiments, and the description is omitted 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 to adjust the energy of the single pulse laser output by the laser generator, reference is made to the description related to the above embodiments, and the description is omitted here.
It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.
Claims (9)
1. A laser transduction apparatus 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; the metal excitation target is of a positively charged metal structure, and the extra-nuclear electrons of the metal atoms are bound under the action of coulomb force, so that the extra-nuclear electrons of the metal atoms are difficult to escape from the nuclear to be bound after absorbing laser energy;
the laser transduction device further comprises a transparent constraint layer, wherein the transparent constraint layer is positioned on the first surface of the metal excitation target;
the transparent constraint layer covers the first surface of the metal excitation target, and the surface of the transparent constraint layer facing the metal excitation target is in seamless contact with the first surface;
the transparent constraint layer is transparent glass.
2. The laser transduction device according to claim 1, wherein the thickness of the transparent constraining layer along a direction perpendicular to the first surface ranges from 0.5mm to 3mm.
3. The laser transduction device according to claim 1, wherein a thickness of said metal excitation target along a direction perpendicular to said first surface ranges from 0.5mm to 3mm.
4. The laser transduction device according to claim 1, wherein said laser generator is a solid state pulsed laser.
5. The laser transducing 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 the timing signal of each frequency corresponds to the laser light of one repetition frequency.
6. The laser transduction device according to claim 5, further comprising a control unit for adjusting the frequency of the timing signal provided by the signal generator and for adjusting the operating current and/or the operating voltage of the laser generator.
7. The laser transduction device according to 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 transmitted to the first surface of the metal excitation target after being expanded and focused by the laser beam expanding and focusing circuit.
8. The laser transduction device according to claim 7, wherein said laser beam expansion and focusing circuitry comprises a beam expansion 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.
9. A control method of a laser transduction apparatus, characterized in that the laser transduction apparatus includes the laser transduction apparatus according to any one of claims 1 to 8, the control method comprising:
applying a positive electrode voltage to the metal excitation target to positively charge the metal excitation 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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| Publication number | Priority date | Publication date | Assignee | Title |
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