CN114113665A - Quasi-continuous diagnostic instrument for two-dimensional shock wave velocity field - Google Patents
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Abstract
The invention discloses a two-dimensional shock wave velocity field quasi-continuous diagnostic instrument which comprises a targeting light-receiving module, an interference module and a recording module, wherein the recording module comprises a second beam splitter, a line imaging recording branch and a compression imaging recording branch. By adopting the technical scheme, through the design of two diagnosis branches, namely the line imaging recording branch and the compression imaging recording branch, the line imaging recording branch can realize the diagnosis of the evolution process of the one-dimensional shock wave velocity field, the compression imaging recording branch adopts a two-channel complementary coding combined with a stripe camera, and the diagnosis of the two-dimensional shock wave velocity field is realized.
Description
Technical Field
The invention relates to the technical field of laser interference speed measurement, in particular to a two-dimensional shock wave velocity field quasi-continuous diagnostic instrument.
Background
Inertial confinement fusion is expected to become an effective way for cleanly utilizing fusion energy in the future, has important research value in the fields of civil economy and military, and develops a series of deep researches around laser inertial confinement fusion in the countries such as the United states, China, Russia and the like in the world.
Inertial confinement fusion can be divided into direct drive and indirect drive according to a driving mode, and in any mode, the inertial confinement fusion is finally embodied in compression implosion of spherical target pellets, and finally high-pressure high-temperature fusion combustion is realized to realize ignition. In laser inertial confinement fusion, shock waves are a very important physical quantity. Firstly, the shock wave velocity is a physical quantity which can be directly measured in the research of high-pressure physical properties of the material, and can be used for indirectly diagnosing the states of pressure, temperature and the like of the material in a confined fusion decomposition experiment; secondly, shock wave speed regulation is an important experimental means in laser inertial confinement fusion research and is used for realizing quasi-isentropic compression of multi-step pulses; thirdly, the diagnosis of the shock wave velocity history of the target pill at two, three or more angles is realized by carrying out unique structural design inside the target pill, and the compression symmetry of the target pill in the shock wave loading stage is diagnosed by comparing the velocity histories; finally, based on a two-dimensional arbitrary reflecting surface velocity interferometer (2D-VISAR for short) developed internationally at present, the appearance of the shock wave at a certain specific time can be measured, so that defects in the material can be diagnosed or weak modulation of a loading source can be driven, and the development of a precise experiment can be promoted.
The velocity interferometer (VISAR for short) with any reflecting surface is a key diagnostic system for diagnosing the velocity process of shock waves, probe laser is reflected on a shock wave interface by actively inputting a beam of pulse probe light, the velocity change information of the shock wave front is converted into the movement of interference fringes by using an optical Doppler effect and an unequal arm interferometer, and then the movement is imaged to a slit of an optical fringe camera to finish the high-time-resolution quasi-continuous recording.
The slit of the optical fringe camera is one-dimensional space resolution, and only the change on one-dimensional area of the interference pattern is recorded, so that the VISAR can only diagnose the speed change process on one line of the shock wave front, and is also called as 1D-VISAR. Based on the requirement of two-dimensional shock wave velocity field morphology diagnosis, a velocity interferometer for diagnosing two-dimensional shock wave velocity field morphology, namely 2D-VISAR, has recently been invented in the United states. However, since the gated camera is used for recording, only the shock wave morphology of one time point can be acquired, and the influence of the probe light background except the interference fringes is limited, so that the high signal-to-noise ratio interference pattern is difficult to record in principle.
It is urgent to solve the above problems.
Disclosure of Invention
In order to solve the technical problems, the invention provides a two-dimensional shock wave velocity field quasi-continuous diagnostic instrument.
The technical scheme is as follows:
the utility model provides a two-dimentional shock wave velocity field accurate continuous diagnostic apparatus, receives optical module, interference module and record module including the target, its main points lie in: the recording module comprises a second beam splitter, a line imaging recording branch and a compression imaging recording branch, the line imaging recording branch comprises a third lens, an inverted prism and a first optical fringe camera, the compression imaging recording branch comprises a third beam splitter, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a first spatial light modulator, a second spatial light modulator and a second optical fringe camera, binary coding plates are arranged on the first spatial light modulator and the second spatial light modulator, and the distances between the third beam splitter and the fifth lens, between the sixth lens, between the seventh lens and the eighth lens are equal, so that the fifth lens and the sixth lens and between the eighth lens and the sixth lens and between the sixth lens and the seventh lens form an optical 4f system;
the target hitting light receiving module emits Doppler signal reflected light reflected by the target to the interference module so as to convert speed change information of a target reflecting surface carried by the Doppler signal reflected light into movement of interference fringes, and the Doppler signal reflected light with the movement of the interference fringes is divided into two parts by the second beam splitter;
one path of Doppler signal reflected light with interference fringe movement is guided to the inverted prism through the third lens, and is finally recorded by the first optical fringe camera after the Doppler signal reflected light with the interference fringe movement is rotated by the inverted prism;
the other path of Doppler signal reflected light with interference fringe movement is imaged to a primary image surface through a fourth lens, then is collimated through a fifth lens and then is divided into two paths by a third beam splitter, one path of Doppler signal reflected light is imaged onto a first spatial light modulator through a sixth lens, an image with a code reflected by the first spatial light modulator sequentially passes through the sixth lens, the third beam splitter and an eighth lens and then is imaged on a second optical fringe camera with a completely opened slit, the other path of Doppler signal reflected light is imaged onto a second spatial light modulator through a seventh lens, and the image with the code reflected by the second spatial light modulator sequentially passes through the seventh lens, the third beam splitter and the eighth lens and then is imaged on the second optical fringe camera.
Preferably, the method comprises the following steps: the first spatial light modulator and the second spatial light modulator are both digital micromirror arrays, the binary coding plate is a mask plate integrated on the digital micromirror arrays, grids arranged in a matrix mode are arranged on the mask plate, one part of grid Doppler signal reflected light can penetrate through the grids, and the other part of grids can block Doppler signal reflected light from penetrating through the grids.
By adopting the structure, the Doppler signal reflected light is provided with the coded information after passing through, so that the target image information of which area can be clear during subsequent processing, and the original two-dimensional images of different discontinuities can be restored.
Preferably, the method comprises the following steps: the grid that Doppler signal reflected light can pass through on the mask plate of the first spatial light modulator corresponds to the grid that Doppler signal reflected light can pass through on the mask plate of the second spatial light modulator, and the grid that Doppler signal reflected light can pass through on the mask plate of the first spatial light modulator corresponds to the grid that Doppler signal reflected light can pass through on the mask plate of the second spatial light modulator.
By adopting the structure, the coding images of the first spatial light modulator and the second spatial light modulator are strictly complementary, so that complementary coding and compression recording of interference patterns are realized, and the precision of image decoding reconstruction can be improved by combining a reconstruction decoding algorithm.
Preferably, the method comprises the following steps: the target-hitting light-receiving module comprises a first beam splitter, a first lens, a second lens, a driving light laser, a probe light laser and an optical fiber, wherein the driving light laser emits ultrashort pulse laser to a target, probe light emitted by the probe light laser sequentially passes through the optical fiber, the first lens, the first beam splitter and the second lens to be imaged on the target, and is reflected back to Doppler signal light carrying target shock wave information, and the Doppler signal light sequentially passes through the second lens and the first beam splitter to be introduced into the interference module.
With the above structure, the doppler signal light carrying the target shock wave information can be stably and reliably obtained.
Preferably, the method comprises the following steps: the interference module comprises a second reflecting mirror, a third reflecting mirror, a fourth beam splitter and a fifth beam splitter, wherein an etalon is arranged on the third reflecting mirror, Doppler signal light introduced from the targeting and light receiving module is divided into two parts by the fourth beam splitter, one path of Doppler signal light irradiates to the fifth beam splitter through the second reflecting mirror, the other path of Doppler signal light irradiates to the fifth beam splitter after being delayed by the etalon on the third reflecting mirror, and the fifth beam splitter focuses two paths of incident Doppler signal light to form one path of Doppler signal light with interference fringes to be emitted to the second beam splitter.
By adopting the structure, the speed change information of the reflecting surface to be measured of the target can be stably and controllably converted into the movement of interference fringes, so that the light and shade change is formed, and finally the light and shade change is easy to record.
Preferably, the method comprises the following steps: the interference module further comprises a first reflector, and Doppler signal light emitted from the targeting light-receiving module is reflected by the first reflector and then emitted to the fourth beam splitter.
By adopting the structure, the light propagation path can be simply and reliably changed, so that the field can be better utilized.
Preferably, the method comprises the following steps: the slit of the second optical stripe camera is fully open.
By adopting the structure, more information can be recorded, and the two-dimensional shock wave velocity field diagnosis can be better realized in a matching manner.
Compared with the prior art, the invention has the beneficial effects that:
the two-dimensional shock wave velocity field quasi-continuous diagnostic instrument adopting the technical scheme has the advantages that through the design of two diagnostic branches, namely the line imaging recording branch and the compression imaging recording branch, the line imaging recording branch can realize the diagnosis of the evolution process of the one-dimensional shock wave velocity field, and the compression imaging recording branch adopts double-channel complementary coding combined with a stripe camera to realize the diagnosis of the two-dimensional shock wave velocity field, wherein through rotating an inverted prism in the line imaging recording branch, the diagnosis can be carried out by selecting different chord-tangent directions of the shock wave velocity field to be detected, and the scanning check of the two-dimensional velocity field diagnosis of the compression imaging recording branch is realized by combining with the evolution information of the high-precision one-dimensional velocity field, so that the reduction precision of two-dimensional dynamic information is improved, and the high-precision diagnosis of the two-dimensional shock wave velocity field is further completed; therefore, the method is obviously superior to a one-dimensional VISAR which can only measure the shock wave velocity transmission process in a one-dimensional space, and is also obviously superior to a 2D-VISAR which can only obtain the shock wave appearance of one time point.
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FIG. 1 is a schematic diagram of the optical path of a two-dimensional shock wave velocity field quasi-continuous diagnostic instrument;
fig. 2 is a schematic diagram of a binary code plate.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
As shown in FIG. 1, the two-dimensional shock wave velocity field quasi-continuous diagnostic apparatus mainly comprises a targeting light-receiving module, an interference module and a recording module.
The targeting and light-receiving module comprises a first beam splitter BS1, a first lens L1, a second lens L2, a driving light laser 3, a probe light laser 4 and an optical fiber 5.
The focal point of the probe laser 4 is located at one end of the optical fiber 5, and the focal point of the first lens L1 is located at the other end of the optical fiber 5. The driving light laser 3 emits ultrashort pulse laser to a target surface to be measured of the target 2, meanwhile, probe light emitted by the probe light laser 4 is imaged on the target 2 through the optical fiber 5, the first lens L1, the first beam splitter BS1 and the second lens L2 in sequence and is reflected back to Doppler signal light carrying shock wave information of the target 2, and the shock wave information of the target 2 carried by the Doppler signal light is shock wave front surface speed change information. Finally, the doppler signal light carrying the shockwave information of the target 2 is introduced into the interference module through the second lens L2 and the first beam splitter BS1 in sequence.
The interference module comprises a second reflecting mirror M2, a third reflecting mirror M3, a fourth beam splitter BS4 and a fifth beam splitter BS5, an etalon E is arranged on the third reflecting mirror M3 and used for delaying to change the travel time difference of the two paths of light, and the speed change information of the reflecting surface to be detected of the target 2 can be converted into the movement of interference fringes based on the Doppler effect.
Specifically, the doppler signal light introduced from the targeting light-receiving module is first split into two parts by the fourth beam splitter BS4, one path of doppler signal light is emitted to the fifth beam splitter BS5 through the second mirror M2, the other path of doppler signal light is emitted to the fifth beam splitter BS5 after being delayed by the etalon E on the third mirror M3, and the fifth beam splitter BS5 converges the two paths of incident doppler signal light to form one path of doppler signal light with movement of interference fringes, so that the speed change information of the reflecting surface of the target 2 carried by the doppler signal light is converted into movement of the interference fringes and finally recorded by the recording module.
Furthermore, the interference module also comprises a first reflector M1, Doppler signal light emitted from the targeting light-receiving module is reflected by the first reflector M1 and then emitted to the fourth beam splitter BS4, and the propagation path of the light can be simply and reliably changed, so that the field can be better utilized.
Referring to fig. 1, the recording module includes a second beam splitter BS2, a line imaging recording branch and a compression imaging recording branch. The Doppler signal reflected light with the interference fringe movement is divided into two parts by a second beam splitter BS2, one part is led into a line imaging recording branch, and the other part is led into a compression imaging recording branch.
The line imaging recording branch comprises a third lens L3, an inverted prism 1 and a first optical fringe camera C1, one path of Doppler signal reflected light with interference fringe movement emitted by a second beam splitter BS2 is guided to the inverted prism 1 through the third lens L3, and is finally recorded by the first optical fringe camera C1 after the Doppler signal reflected light with interference fringe movement is rotated by the inverted prism 1. Because the inverted prism 1 is arranged in the line imaging recording branch, selection of different chordal cutting angle directions can be realized by rotating the inverted prism 1, and therefore diagnosis can be performed on different chordal cutting directions of the shock wave velocity field to be detected, and scanning and verification of two-dimensional velocity field diagnosis of the compression imaging recording branch can be realized by combining evolution information of a high-precision one-dimensional velocity field, and high-precision diagnosis of the two-dimensional shock wave velocity field can be further completed.
Referring to fig. 1 and 2, the compressed imaging recording branch includes a third beam splitter BS3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a first spatial light modulator DMD1, a second spatial light modulator DMD2, and a second optical stripe camera C2. The first spatial light modulator DMD1 and the second spatial light modulator DMD2 are both provided with binary code plates, and the distances between the third beam splitter BS3 and the fifth lens L5, between the third beam splitter BS 3938 and the sixth lens L6, between the seventh lens L7 and between the third beam splitter BS and the eighth lens L8 are all equal, so that the fifth lens L5 and the sixth lens L6 and the seventh lens L7 respectively, and the eighth lens L8 and the sixth lens L6 and the seventh lens L7 respectively form an optical 4f system.
Therefore, the other path of Doppler signal reflected light with interference fringe movement emitted by the second beam splitter BS2 is imaged to the primary image plane IP by the fourth lens L4, is collimated by the fifth lens L5 and is divided into two parts by the third beam splitter BS3, one path of Doppler signal reflected light is imaged on a first spatial light modulator DMD1 through a sixth lens L6, an image with codes reflected by the first spatial light modulator DMD1 sequentially passes through a sixth lens L6, a third beam splitter BS3 and an eighth lens L8 and then is imaged on a second optical stripe camera C2 with a completely opened slit, the other path of Doppler signal reflected light is imaged onto a second spatial light modulator DMD2 through a seventh lens L7, and an image with codes reflected by the second spatial light modulator DMD2 sequentially passes through a seventh lens L7, a third beam splitter BS3 and an eighth lens L8 and is imaged onto a second optical fringe camera C2.
In the compressed imaging recording branch, firstly, the binary coding boards of the first spatial light modulator DMD1 and the second spatial light modulator DMD2 are used to code and sample two paths of interference patterns respectively, and then each interference pattern obtained by code sampling is imaged to the slit of the second optical fringe camera C2, so that two-dimensional resolution recording of each encoded interference pattern is completed. When the second optical fringe camera C2 runs dynamically, each encoded interference pattern is shifted and superimposed, compressed and recorded on the CCD of the second optical fringe camera C2, then the compressed image is decompressed by iterative computation using a binary code plate to obtain each two-dimensional interference pattern, and then velocity information is resolved therefrom, so that the velocity transmission history of the two-dimensional shock wave wavefront can be obtained. And finally, carrying out proper integral operation on the two-dimensional shock wave velocity to obtain a quasi-continuous transmission process of the two-dimensional shock wave wavefront morphology. Meanwhile, in order to reduce the loss of effective information in the encoding and compressing process, a double-channel complementary sampling optical path is designed in the embodiment, and the restoring precision of the two-dimensional dynamic information can be further improved by matching with a complementary decoding technology.
In this embodiment, the slit of the second optical fringe camera C2 is completely opened, and the slit of the second optical fringe camera C2 is formed in a rectangular shape, so that two-dimensional resolution recording of each encoded interference pattern can be easily and reliably achieved.
Further, the first spatial light modulator DMD1 and the second spatial light modulator DMD2 are both digital micromirror arrays, the binary encoder board is a mask integrated on the digital micromirror arrays, and the mask is provided with grids a arranged in a matrix manner, wherein a part of the grids a can pass through doppler signal reflected light, and the other part of the grids a can block the doppler signal reflected light from passing through. In addition, because gold can well block Doppler signal reflection light, and the gold plating mode has simple process and is convenient to manufacture, part of the grid a which can block the Doppler signal reflection light from passing through is manufactured on the mask plate through the gold plating process.
In this embodiment, the two-dimensional wavefront transmission history calculation method is as follows:
obtaining a coded compression result E (x, y) of the two-dimensional interference pattern using a compressed imaging recording branch
E(x，y)＝TSCI(x，y，t) (1)
In the formula (1), E (x, y) is a two-dimensional image which is subjected to offset compression and recorded on the CCD of the second optical fringe camera C2, I (x, y, T) is time-evolution data of a two-dimensional interference pattern to be measured, C is an encoding operation performed on the first spatial light modulator DMD1 or the second spatial light modulator DMD2, S is an offset operation formed by dynamic scanning of the second optical fringe camera C2, and T is a superposition recording operation of the CCD of the second optical fringe camera C2.
To solve the above equation back to obtain two-dimensional interference pattern evolution data I (x, y, t), it is usually converted to a minimum solution of the following equation:
in equation (2), λ is a regularization parameter, and Φ is a regularization function.
Each frame of the two-dimensional interference pattern I (x, y, t) is decompressed from the compressed pattern by iterative computation. Through each interference image I (x, y, t), the interference fringe change process I (x, y) of one-dimensional space can be extracted0T), then solving the velocity variation process v (x, y) of the one-dimensional space0T), by using the method, the velocity change process of each one-dimensional space can be solved, and the velocity change process v (x, y, t) of the whole two-dimensional shock wave can be obtained through a combined structure. Combining the initial profile P (x, y, t) of the shock wave wavefront0) And integrating each time point of the two-dimensional shock wave speed change process to obtain the two-dimensional shock wave wavefront morphology P (x, y, t) of each time point.
A double-channel complementary sampling light path is designed in the compression imaging recording branch, coding images on the first spatial light modulator DMD1 and the second spatial light modulator DMD2 are strictly complementary, namely a grid a through which Doppler signal reflected light can pass on a mask plate of the first spatial light modulator DMD1 corresponds to a grid a through which Doppler signal reflected light can pass on a mask plate of the second spatial light modulator DMD2, and a grid a through which Doppler signal reflected light can pass on a mask plate of the first spatial light modulator DMD1 corresponds to a grid a through which Doppler signal reflected light can pass on a mask plate of the second spatial light modulator DMD 2. Therefore, complementary coding and compression recording of the interference pattern are realized, and the accuracy of image decoding reconstruction can be improved by combining a reconstruction decoding algorithm.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (7)
1. The utility model provides a two-dimentional shock wave velocity field quasi-continuous diagnostic apparatus, receives optical module, interference module and record module including the target, its characterized in that: the recording module comprises a second beam splitter (BS2), a line imaging recording branch and a compressed imaging recording branch, the line imaging recording branch comprises a third lens (L3), an inverted prism (1) and a first optical stripe camera (C1), the compressed imaging recording branch comprises a third beam splitter (BS3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a first spatial light modulator (DMD1), a second spatial light modulator (DMD2) and a second optical stripe camera (C2), binary coding plates are arranged on the first spatial light modulator (DMD1) and the second spatial light modulator (DMD2), the fifth lens (L3) and the fifth lens (L2), the sixth lens (L39 6), the seventh lens (L7) and the eighth lens (L8) are respectively equal in pitch, and the fifth lens (BS3) and the eighth lens (L7) are respectively equal in pitch, and the eighth lens (L5) are respectively equal to the seventh lens (L6) and the eighth lens (L5) and the eighth lens (L3524) L8) respectively constitute an optical 4f system with the sixth lens (L6) and the seventh lens (L7);
the target hitting light receiving module emits Doppler signal reflected light reflected by the target (2) to the interference module so as to convert speed change information of a reflecting surface of the target (2) carried by the Doppler signal reflected light into movement of interference fringes, and the Doppler signal reflected light with the movement of the interference fringes is divided into two parts by a second beam splitter (BS 2);
one path of Doppler signal reflected light with interference fringe movement is guided to the inverted prism (1) through a third lens (L3), and is finally recorded by a first optical fringe camera (C1) after the Doppler signal reflected light moving by the interference fringe is rotated by the inverted prism (1);
the other path of Doppler signal reflected light with the movement of the interference fringes is imaged to a primary Image Plane (IP) through a fourth lens (L4), is collimated through a fifth lens (L5) and is divided into two parts through a third beam splitter (BS3), one path of Doppler signal reflected light is imaged on a first spatial light modulator (DMD1) through a sixth lens (L6), an image with codes reflected by the first spatial light modulator (DMD1) sequentially passes through a sixth lens (L6), a third beam splitter (BS3) and an eighth lens (L8) and then is imaged on a second optical stripe camera (C2) with a completely opened slit, the other path of Doppler signal reflected light is imaged on a second spatial light modulator (DMD2) through a seventh lens (L7), and an image with codes reflected by the second spatial light modulator (DMD2) sequentially passes through a seventh lens (L7), a third beam splitter (BS3) and an eighth lens (L8) and then is imaged on a second optical stripe camera (C2).
2. A two-dimensional shockwave velocity field quasi-continuous diagnostic instrument according to claim 1, wherein: the first spatial light modulator (DMD1) and the second spatial light modulator (DMD2) are both digital micromirror arrays, the binary coding plate is a mask plate integrated on the digital micromirror arrays, grids (a) arranged in a matrix mode are arranged on the mask plate, one part of grids (a) can be penetrated by Doppler signal reflected light, and the other part of grids (a) can be blocked by the Doppler signal reflected light.
3. A two-dimensional shockwave velocity field quasi-continuous diagnostic instrument according to claim 2, wherein: the grid (a) through which the Doppler signal reflected light can pass on the mask plate of the first spatial light modulator (DMD1) corresponds to the grid (a) through which the Doppler signal reflected light can pass on the mask plate of the second spatial light modulator (DMD2), and the grid (a) through which the Doppler signal reflected light can pass on the mask plate of the first spatial light modulator (DMD1) corresponds to the grid (a) through which the Doppler signal reflected light can pass on the mask plate of the second spatial light modulator (DMD 2).
4. A two-dimensional shockwave velocity field quasi-continuous diagnostic instrument according to claim 1, wherein: the targeting and light receiving module comprises a first beam splitter (BS1), a first lens (L1), a second lens (L2), a driving light laser (3), a probe light laser (4) and an optical fiber (5), wherein the driving light laser (3) emits ultrashort pulse laser to a target (2), probe light emitted by the probe light laser (4) sequentially passes through the optical fiber (5), the first lens (L1), the first beam splitter (BS1) and the second lens (L2) to be imaged on the target (2), and is reflected back to Doppler signal light carrying shock wave information of the target (2), and the Doppler signal light sequentially passes through the second lens (L2) and the first beam splitter (BS1) to be introduced into the interference module.
5. A two-dimensional shockwave velocity field quasi-continuous diagnostic instrument according to claim 1, wherein: the interference module comprises a second reflecting mirror (M2), a third reflecting mirror (M3), a fourth beam splitter (BS4) and a fifth beam splitter (BS5), wherein an etalon (E) is arranged on the third reflecting mirror (M3), Doppler signal light introduced from the targeting light-receiving module is divided into two parts by the fourth beam splitter (BS4), one path of Doppler signal light is shot to the fifth beam splitter (BS5) through the second reflecting mirror (M2), the other path of Doppler signal light is shot to the fifth beam splitter (BS5) after being delayed through the etalon (E) on the third reflecting mirror (M3), and the fifth beam splitter (BS5) respectively focuses two paths of incident Doppler signal light to form one path of Doppler signal light with interference fringe movement and emits the Doppler signal light to the second beam splitter (BS 2).
6. A two-dimensional shockwave velocity field quasi-continuous diagnostic instrument according to claim 5, wherein: the interference module also comprises a first reflecting mirror (M1), and Doppler signal light emitted from the targeting light-receiving module is reflected by the first reflecting mirror (M1) to be emitted to a fourth beam splitter (BS 4).
7. A two-dimensional shockwave velocity field quasi-continuous diagnostic instrument according to claim 1, wherein: the slit of the second optical stripe camera (C2) is fully open.
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