Laser-induced plasma visualization experiment platform and use method

Abstract

The invention provides a laser-induced plasma visualization experiment platform and a use method. The laser-induced plasma visualization experiment platform comprises a laser-induced breakdown module, an image acquisition module and a control module, the laser-induced breakdown module comprises a laser used for emitting pulse laser, an attenuator, a beam compressor and a beam splitter are sequentially arranged in the pulse laser propagation direction of the laser, and a reflector, an amplification objective lens and a cuvette are arranged in the propagation direction of a beam of pulse laser split by the beam splitter; the image acquisition module comprises a high-speed camera and an ICCD (Intensified Charge Coupled Device) camera, and a lens of the high-speed camera and a lens of the ICCD camera are both compared with the cuvette; the control module comprises a computer control submodule and a signal generator, the computer control submodule is in communication connection with the signal generator, the high-speed camera and the ICCD camera, and the signal generator is in communication connection with the laser, the high-speed camera and the ICCD camera. According to the platform, the whole dynamic process of induced breakdown of nanosecond pulse laser in liquid is visualized.

Description

Technical Field

[0001] The present invention belongs to the technical field of laser-induced plasma test equipment, and particularly relates to a laser-induced plasma visualization experimental platform and a usage method thereof. Background Art

[0002] In the laboratory, pulsed lasers are often used to detect biological tissues. However, during the detection process, high-energy focused pulsed lasers will cause laser-induced breakdown (LIB) of biological tissues, forming phenomena such as plasma, cavitation bubbles, and shock waves. The shock wave generated by the expansion of the plasma and the oscillation of the cavitation bubbles will seriously interfere with the laser detection results and cause damage to biological tissues. Therefore, it is crucial to explore the dynamic processes of nanosecond laser-induced plasma and cavitation bubbles and achieve visual imaging of the plasma and cavitation bubbles for improving the accuracy of laser detection.

[0003] The time scale for plasma formation is nanoseconds, and the time scale for cavitation bubble oscillation is microseconds. Most of the existing plasma experimental platforms can only measure the energy threshold for plasma generation and cannot collect pictures of the plasma plume. The spectral systems that can collect pictures do not focus on the dynamic behavior of the plasma but simply analyze the material composition based on the picture information. The experimental platforms for photographing cavitation bubbles are limited by the time accuracy of the experimental equipment and cannot detect the plasma. For example, a laser plasma measurement device and measurement method with intelligent control disclosed in CN105259161B can measure the laser energy and obtain plasma information at different spatial positions through spectroscopy. However, this device cannot achieve visual images of the plasma plume and cavitation bubble oscillation, and thus cannot visualize the entire dynamic process of pulsed laser-induced breakdown in liquids. Moreover, in the determination of the breakdown threshold, it is judged whether plasma is formed and the breakdown threshold is statistically determined by the experimenter observing whether there is a bright light with the naked eye and whether there is a blasting sound heard by the ear, resulting in poor accuracy of the laser-induced breakdown threshold measured by the experimenter. Summary of the Invention

[0004] In order to solve the problem that the existing plasma experimental platform cannot visualize the entire dynamic process of pulsed laser-induced breakdown in liquids, resulting in poor accuracy of the measured laser-induced breakdown threshold, the present invention provides a laser-induced plasma visualization experimental platform and a usage method thereof.

[0005] To achieve the above object, the present invention provides the following technical solutions: The present invention proposes a laser-induced plasma visualization experimental platform, including a laser-induced breakdown module, an image acquisition module, and a control module; The laser-induced breakdown module includes a laser for emitting pulsed laser. An attenuator, a beam expander, and a beam splitter are sequentially arranged in the propagation direction of the pulsed laser of the laser. A reflecting mirror, a magnifying objective lens, and a cuvette are arranged in the propagation direction of a beam of pulsed laser split by the beam splitter. The image acquisition module includes a high-speed camera and an ICCD camera. The lenses of the high-speed camera and the ICCD camera are both relative to the cuvette. The control module includes a computer control sub-module and a signal generator. The computer control sub-module is communicatively connected to the signal generator, the high-speed camera, and the ICCD camera. The signal generator is communicatively connected to the laser, the high-speed camera, and the ICCD camera.

[0006] Preferably, the image acquisition module further includes a light source input device arranged on the side of the cuvette. The light source input device is used for inputting a planar light source.

[0007] Preferably, the image acquisition module further includes an image enhancement sub-module arranged between the cuvette and the lens of the high-speed camera. The image enhancement sub-module includes a second aperture, a lens, and a filter sequentially installed from the lens of the high-speed camera to the cuvette.

[0008] Preferably, the image acquisition module further includes a notch filter, which is arranged between the cuvette and the lens of the ICCD camera.

[0009] Preferably, the shooting speed range of the high-speed camera is 20000 fps to 800000 fps, and the shutter width range of the ICCD camera is 1 ns to 999 us.

[0010] Preferably, the laser-induced breakdown module further includes a first aperture, which is arranged in the propagation direction of the pulsed laser between the laser and the attenuator. The laser-induced breakdown module further includes an energy meter, which is arranged in the propagation direction of the other beam of pulsed laser split by the beam splitter.

[0011] Preferably, the magnifying objective lens is a 10x objective lens.

[0012] Preferably, a three-dimensional displacement stage is arranged at the bottom of the cuvette.

[0013] Preferably, the beam of the pulsed laser adjusted by the beam expander is 3 mm to 10 mm, the emission frequency range of the laser is 1 Hz to 20 Hz, and the wavelength range of the emitted pulsed laser is 532 nm to 1064 nm.

[0014] The present invention provides a method for using a laser-induced plasma visualization experimental platform, which is used to operate the above-mentioned laser-induced plasma visualization experimental platform, and includes the following steps: Set the shutter width information of the ICCD camera and the shooting speed information of the high-speed camera through the computer control sub-module in the control module, and synchronously transmit control information to the ICCD camera, the high-speed camera, and the laser in the laser-induced breakdown module through a signal generator; The laser, the ICCD camera, and the high-speed camera are started synchronously. The laser emits pulsed laser, and the pulsed laser sequentially passes through an attenuator, a beam expander, a beam splitter, a reflector, and an amplification objective lens, and irradiates the liquid to be measured filled in a cuvette; At the same time, the ICCD camera and the high-speed camera collect images of the liquid to be measured in the cuvette under the irradiation of the pulsed laser.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a laser-induced plasma visualization experimental platform. This platform controls the synchronous operation of the laser-induced breakdown module and the image acquisition module through a control module, so that the laser-induced breakdown module emits pulsed laser, irradiates in the liquid to be measured to induce the generation of plasma, and then the image acquisition module collects the image of the liquid to be measured under the irradiation of the pulsed laser, thereby obtaining the cavitation bubble oscillation process, realizing the visualization of the entire dynamic process of nanosecond pulsed laser-induced breakdown in liquid, and can obtain rich information such as the spatial distribution characteristics of plasma, the length of plasma plume, the shape, diameter, and oscillation period of cavitation bubbles. Determine the breakdown threshold by counting the cavitation bubble generation frequency, avoiding the limitations of naked-eye observation and ear listening, and improving the accuracy of laser-induced breakdown threshold measurement.

[0016] Furthermore, this platform provides a planar light source for the image acquisition of the high-speed camera through a light source input device on the side of the cuvette, so that the high-speed camera can obtain a bright image of cavitation bubbles.

[0017] Even further, this platform has an image enhancement sub-module between the cuvette and the lens of the high-speed camera. The image enhancement sub-module eliminates the influence of the pulsed laser itself by adding a filter in front of the high-speed camera, and adds a lens to enhance the imaging effect of cavitation bubbles, and then adjusts the size of the collected image through the second aperture 13, so that the image quality, clarity, and size of the image collected by the high-speed camera are appropriate, and thus it is possible to clearly and intuitively understand the generation of cavitation bubbles and indirectly judge the generation of plasma.

[0018] Furthermore, the platform reduces the influence of external factors on the ICCD camera's acquisition of the plasma luminescence image by setting a notch filter between the cuvette and the lens of the ICCD camera to block the pulsed laser from entering the lens of the ICCD camera. Description of the Drawings

[0019] Figure 1 It is a system layout diagram of the laser-induced plasma visualization experimental platform provided by the present invention; In the drawings: 1. Laser; 2. First aperture; 3. Attenuator; 4. Beam expander; 5. Beam splitter; 6. Mirror; 7. Energy meter; 8. Magnifying objective lens; 9. Controller; 10. Cuvette; 11. Filter; 12. Lens; 13. Second aperture; 14. High-speed camera; 15. Light source input device; 16. Notch filter; 17. ICCD camera; 18. Signal generator. Detailed Embodiments

[0020] In the following, only some exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are considered to be exemplary in nature rather than restrictive.

[0021] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.

[0022] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0023] In the present invention, unless otherwise clearly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] The present invention provides a laser-induced plasma visualization experimental platform, as Figure 1 shown, which includes a laser-induced breakdown module, an image acquisition module, and a control module; the control module controls the synchronous operation of the laser-induced breakdown module and the image acquisition module, so that the laser-induced breakdown module emits pulsed laser, irradiates the liquid to be measured to induce the generation of plasma, and then the image acquisition module acquires the image of the liquid to be measured under the irradiation of the pulsed laser, thereby obtaining the cavitation bubble oscillation process, realizing the visualization of the entire dynamic process of nanosecond pulsed laser-induced breakdown in the liquid, and capable of obtaining rich information such as the spatial distribution characteristics of the plasma, the length of the plasma plume, the shape, diameter, and oscillation period of the cavitation bubble. By statistically counting the generation frequency of the cavitation bubbles, the breakdown threshold is determined, avoiding the limitations of naked-eye observation and ear listening, and improving the accuracy of measuring the laser-induced breakdown threshold.

[0027] The laser-induced breakdown module includes a laser 1. An attenuator 3, a beam expander 4, and a beam splitter 5 are sequentially arranged in the propagation direction of the pulsed laser of the laser 1. A reflecting mirror 6, an amplifying objective lens 8, and a cuvette 10 are arranged in the propagation direction of one of the pulsed laser beams split by the beam splitter 5. The laser 1 is used to emit pulsed laser with an energy greater than 3.6 mJ. The pulsed laser passes through the attenuator 3 to greatly reduce the light intensity, making the laser intensity less than 1 mJ, and then passes through the beam expander 4 for beam adjustment. The pulsed laser after beam adjustment enters the beam splitter 5 for splitting. A part of the split pulsed laser is reflected by the reflecting mirror 6 into the amplifying objective lens 8 for focusing to increase the energy density of the pulsed laser and irradiate the liquid to be measured contained in the cuvette 10. The focused pulsed laser induces the generation of plasma in the liquid to be measured. Among them, the beam of the pulsed laser adjusted by the beam expander 4 is 3 mm to 10 mm, the emission frequency range of the laser 1 is 1 Hz to 20 Hz, the wavelength range of the emitted pulsed laser is 532 nm to 1064 nm, the cuvette 10 is a four-way optical glass cuvette, and the amplifying objective lens 8 is a 10-fold objective lens.

[0028] Preferably, a three-dimensional displacement stage is arranged at the bottom of the cuvette 10. The position of the glass cuvette is adjusted through the three-dimensional displacement stage to make the laser-induced breakdown occur near the liquid surface and reduce the influence of the liquid surface depth on the experiment.

[0029] The image acquisition module includes a high-speed camera 14 and an ICCD camera 17. The shooting speed range of the high-speed camera 14 is 20000 fps to 800000 fps, and the shutter width range of the ICCD camera 17 is 1 ns to 999 us. The lenses of the high-speed camera 14 and the ICCD camera 17 are both relative to the cuvette 10. When the pulsed laser irradiates the liquid to be measured contained in the cuvette 10, the high-speed camera 14 and the ICCD camera 17 synchronously acquire the luminous images of the plasma and the expansion, contraction, and collapse processes of the cavitation bubbles in the liquid to be measured, and then obtain the entire dynamic process of the nanosecond pulsed laser-induced breakdown in the liquid to improve the accuracy of the experimenter in determining the plasma breakdown energy threshold.

[0030] The control module includes a computer control sub-module 9 and a signal generator 18. The computer control sub-module 9 is communicatively connected to the signal generator 18, the high-speed camera 14, and the ICCD camera 17. The signal generator 18 is communicatively connected to the laser 1, the high-speed camera 14, and the ICCD camera 17. Since the experimental phenomenon of the nanosecond laser-induced plasma generation lasts for a very short time, usually only dozens of nanoseconds, and the cavitation bubble oscillation caused by the plasma shock wave is also only dozens of microseconds, the computer control sub-module 9 cooperates with the signal generator 18 to synchronously control the operation of the laser 1, the high-speed camera 14, and the ICCD camera 17 to reduce the error between the judged plasma breakdown energy threshold and the actual plasma breakdown energy threshold.

[0031] As Figure 1 shown, the image acquisition module further includes a light source input device 15 disposed on the side of the cuvette 10. The light source input device 15 is used to input a planar light source. Since the single-frame exposure time of the high-speed camera 14 will be correspondingly shortened when the frame rate is increased, the amount of light captured per frame is reduced, resulting in a darker captured image. By using a planar light source for supplementary lighting, the high-speed camera 14 can obtain a bright cavitation bubble image, which is convenient for the subsequent judgment of the plasma breakdown energy threshold and the analysis of the cavitation bubble oscillation process.

[0032] As Figure 1 shown, the image acquisition module further includes an image enhancement sub-module disposed between the cuvette 10 and the lens of the high-speed camera 14. The image enhancement sub-module includes a second aperture 13, a lens 12, and a filter 11 sequentially installed from the lens of the high-speed camera 14 to the cuvette 10. By adding a filter in front of the high-speed camera 14 to eliminate the influence of the pulsed laser itself, and adding a lens 12 to enhance the imaging effect of the cavitation bubble, and then adjusting the size of the captured image through the second aperture 13, the quality, clarity, and size of the image captured by the high-speed camera 14 are made appropriate, so that the generation of cavitation bubbles can be clearly and intuitively understood, and the generation of plasma can be indirectly judged.

[0033] As Figure 1 shown, the image acquisition module further includes a notch filter 16, which is disposed between the cuvette 10 and the lens of the ICCD camera 17. The notch filter 16 is used to block the pulsed laser from entering the lens of the ICCD camera 17 and affecting the acquisition of the plasma emission image by the ICCD camera 17.

[0034] As Figure 1 shown, the laser-induced breakdown module further includes a first aperture 2, which is disposed on the propagation direction of the pulsed laser between the laser 1 and the attenuator 3.

[0035] As Figure 1 shown, the laser-induced breakdown module further includes an energy meter 7, which is disposed on the propagation direction of the other beam of pulsed laser split by the beam splitter 5. A part of the laser split by the beam splitter 5 enters the energy meter 7, and the energy of the pulsed laser emitted in real time is measured by the energy meter 7.

[0036] The present invention proposes a method for using a laser-induced plasma visualization experimental platform for operating the above-mentioned laser-induced plasma visualization experimental platform, including the following steps: Set the shutter width information of the ICCD camera 17 and the shooting speed information of the high-speed camera 14 through the computer control sub-module 9 in the control module, and synchronously transmit control information to the ICCD camera 17, the high-speed camera 14, and the laser 1 in the laser-induced breakdown module through the signal generator 18; The laser 1, ICCD camera 17, and high-speed camera 14 are started synchronously. The laser 1 emits pulsed laser, and the pulsed laser sequentially passes through the attenuator 3, beam expander 4, beam splitter 5, mirror 6, and magnifying objective 8, and irradiates the liquid to be measured filled in the cuvette 10. At the same time, the ICCD camera 17 and high-speed camera 14 collect images of the liquid to be measured in the cuvette 10 under the irradiation of the pulsed laser.

[0037] Specifically, before the experiment, the laser 1, ICCD camera 17, and high-speed camera 14 are powered on and preheated for 30 minutes. The cuvette 10 is filled with the liquid to be measured. The laser optical path and energy where the laser 1 is located are adjusted. The computer control sub-module 9 in the control module sets the shutter width of the ICCD camera 17 to 6 ns and the shooting speed of the high-speed camera 14 to 300,000 fps. The passing beams of the first aperture 2 and the second aperture 12 are adjusted to an appropriate size, and the focal lengths of the ICCD camera 17 and high-speed camera 14 are adjusted.

[0038] The control module synchronously transmits control information to the ICCD camera 17, high-speed camera 14, and the laser 1 in the laser-induced breakdown module through the signal generator 18; so that while the laser 1 emits pulsed laser with a frequency of 1 Hz, an energy greater than 3.6 mJ, and a wavelength of 1064 nm, the ICCD camera 17 and high-speed camera 14 perform image acquisition. The laser 1 emits pulsed laser. The pulsed laser is attenuated in energy by the attenuator 3 to an energy less than 1 mJ. The pulsed laser with attenuated energy enters the beam expander 4 to adjust the laser beam size to 5 mm and enters the beam splitter 5 for beam splitting. One part of the beam-split pulsed laser irradiates on the mirror 6, and the other part of the beam-split pulsed laser irradiates on the energy meter 7. The energy of the pulsed laser emitted in real time is measured by the energy meter 7. The propagation direction of the pulsed laser is changed by the mirror 6 so that the pulsed laser propagates into the magnifying objective 8 for focusing. The focused pulsed laser propagates into the cuvette 10 and enters the liquid to be measured filled in the cuvette 10, inducing the generation of plasma in the solution. It is observed with the naked eye whether there is a bright light in the liquid to be measured in the cuvette 10 and whether a blasting sound is heard by the human ear. To reduce the influence of the liquid level depth on the experiment, once plasma appears in the cuvette sample cell, the position of the glass cuvette 10 is adjusted by the three-dimensional displacement stage so that the laser-induced breakdown occurs near the liquid surface. The ICCD camera 17 and high-speed camera 14 perform image acquisition. The high-speed camera 14 captures the cavitation bubble oscillation process caused by the bright plasma, and the ICCD camera 17 captures the plasma emission images at different times. At the same time, the expansion, contraction, and collapse processes of the cavitation bubbles at this energy are obtained, and then the entire dynamic process of nanosecond pulsed laser-induced breakdown in the liquid is obtained, and the accurate plasma breakdown energy threshold is judged.

[0039] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes that fall within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims concerned.

[0040] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. Laser-induced plasma visualization experimental platform, characterized in that, It includes a laser-induced breakdown module, an image acquisition module and a control module; The laser-induced breakdown module includes a laser (1) for emitting pulsed laser. An attenuator (3), a beam expander (4) and a beam splitter (5) are sequentially arranged in the propagation direction of the pulsed laser of the laser (1); A reflector (6), a magnifying objective lens (8) and a cuvette (10) are arranged in the propagation direction of a part of the pulsed laser after being split by the beam splitter (5); The image acquisition module includes a high-speed camera (14) and an ICCD camera (17). The lenses of the high-speed camera (14) and the ICCD camera (17) are both relative to the cuvette (10); The control module includes a computer control sub-module (9) and a signal generator (18). The computer control sub-module (9) is communicatively connected to the signal generator (18), the high-speed camera (14) and the ICCD camera (17). The signal generator (18) is communicatively connected to the laser (1), the high-speed camera (14) and the ICCD camera (17).

2. The laser-induced plasma visualization experimental platform according to claim 1, wherein The image acquisition module further includes a light source inputter (15) arranged on the side of the cuvette (10), and the light source inputter (15) is used for inputting a plane light source.

3. The laser-induced plasma visualization experimental platform according to claim 2, wherein The image acquisition module further includes an image enhancement sub-module arranged between the cuvette (10) and the lens of the high-speed camera (14). The image enhancement sub-module includes a second aperture (13), a lens (12) and a filter (11) sequentially installed from the lens of the high-speed camera (14) to the cuvette (10).

4. The laser-induced plasma visualization experimental platform according to claim 3, characterized in that The image acquisition module further includes a notch filter (16), and the notch filter (16) is arranged between the cuvette (10) and the lens of the ICCD camera (17).

5. The laser-induced plasma visualization experimental platform according to claim 4, wherein The shooting speed range of the high-speed camera (14) is 20000fps~800000fps, and the shutter width range of the ICCD camera (17) is 1ns~999us.

6. The laser-induced plasma visualization experimental platform according to claim 1, characterized in that The laser-induced breakdown module further includes a first aperture (2), and the first aperture (2) is arranged in the propagation direction of the pulsed laser between the laser (1) and the attenuator (3); The laser-induced breakdown module further includes an energy meter (7), and the energy meter (7) is arranged in the propagation direction of the other beam of pulsed laser after being split by the beam splitter (5).

7. The laser-induced plasma visualization experimental platform according to claim 6, characterized in that, The magnifying objective lens (8) is a 10-fold objective lens.

8. The laser-induced plasma visualization experimental platform according to claim 7, characterized in that, A three-dimensional displacement stage is arranged at the bottom of the cuvette (10).

9. The laser-induced plasma visualization experimental platform according to claim 7, characterized in that The beam of the pulsed laser adjusted by the beam expander (4) is 3mm~10mm, the emission frequency range of the laser (1) is 1Hz~20Hz, and the wavelength range of the emitted pulsed laser is 532nm~1064nm.

10. Method for using a laser-induced plasma visualization experimental platform, which is used to operate the laser-induced plasma visualization experimental platform according to any one of claims 1 to 9, characterized in that, It includes the following steps: The computer control sub-module (9) in the control module sets the shutter width information of the ICCD camera (17) and the shooting speed information of the high-speed camera (14), and synchronously transmits control information to the ICCD camera (17), the high-speed camera (14), and the laser (1) in the laser-induced breakdown module through the signal generator (18); The laser (1), the ICCD camera (17), and the high-speed camera (14) are started synchronously. The laser (1) emits pulsed laser, and the pulsed laser sequentially passes through the attenuator (3), the beam expander (4), the beam splitter (5), the mirror (6), and the magnifying objective lens (8), and irradiates the liquid to be measured filled in the cuvette (10); At the same time, the ICCD camera (17) and the high-speed camera (14) collect images of the liquid to be measured in the cuvette (10) under the irradiation of the pulsed laser.

Images