CN114113665B - Two-dimensional shock wave speed field quasi-continuous diagnostic instrument - Google Patents
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- 230000035939 shock Effects 0.000 title claims abstract description 47
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
- G01P3/38—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light using photographic means
Abstract
The invention discloses a two-dimensional shock wave speed field 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. According to the technical scheme, through the design of the two diagnosis branches of the line imaging recording branch and the compression imaging recording branch, the line imaging recording branch can realize diagnosis of the evolution process of the one-dimensional shock wave velocity field, the compression imaging recording branch adopts the dual-channel complementary coding combined stripe camera, and two-dimensional shock wave velocity field diagnosis is realized, wherein the inversion prism in the rotation line imaging recording branch can select different chord tangent directions of the shock wave velocity field to be detected for diagnosis, and the scanning and verification of the two-dimensional velocity field diagnosis of the compression imaging recording branch are realized by combining high-precision one-dimensional velocity field evolution information, so that the recovery precision of two-dimensional dynamic information is improved, and further the high-precision diagnosis of the two-dimensional shock wave velocity field is completed.
Description
Technical Field
The invention relates to the technical field of laser interference speed measurement, in particular to a two-dimensional shock wave speed field quasi-continuous diagnostic instrument.
Background
Inertial confinement fusion is expected to become an effective way for utilizing fusion energy in the future, has important research value in both civil economy and military fields, and is developed around laser inertial confinement fusion in the large countries such as the United states, china, russia and the like in the world.
The inertial confinement fusion can be divided into direct drive and indirect drive according to the driving mode, and the two modes are finally reflected in compression implosion of the spherical target pill, so that high-pressure high Wen Jubian combustion is finally realized, and ignition is realized. In laser inertial confinement fusion, shock waves are a very important physical quantity. Firstly, the shock wave speed 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 constraint 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, diagnosis of the shock wave velocity histories of two, three or more angles of the target pill 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 velocity histories comparison; finally, based on the two-dimensional arbitrary reflecting surface velocity interferometer (2D-VISAR for short) which has been developed internationally at present, the morphology of the shock wave at a specific time can be measured, so that the defect in the material or the weak modulation of a driving loading source can be diagnosed, and the development of a precise experiment can be promoted.
Any reflecting surface Velocity Interferometer (VISAR) is a key diagnosis system for diagnosing the velocity history of the shock wave, a beam of pulse probe light is actively input, probe laser is reflected at a shock wave interface, velocity change information of the shock wave front is converted into movement of interference fringes by utilizing an optical Doppler effect and an unequal arm interferometer, and then the movement of the interference fringes is imaged to a slit of an optical fringe camera, so that high-time-resolution quasi-continuous recording is completed.
The slit of the optical fringe camera is one-dimensional space resolution, and only changes in one-dimensional area of the interference pattern are recorded, so that the VISAR can only diagnose the speed change history of a shock wave wavefront on one line, which is also called 1D-VISAR. Based on the need for two-dimensional shockwave velocity field profile diagnostics, the united states has recently invented a velocity interferometer, i.e., 2D-VISAR, that diagnoses two-dimensional shockwave velocity field profiles. However, since the gating camera is used for recording, only the morphology of the shock wave at one time point can be acquired, and the interference pattern with high signal to noise ratio is difficult to record in principle due to the influence of the probe light background outside the interference fringes.
Solving the above problems is urgent.
Disclosure of Invention
In order to solve the technical problems, the invention provides a two-dimensional shock wave speed field quasi-continuous diagnostic instrument.
The technical scheme is as follows:
the utility model provides a two-dimensional shock wave velocity field quasi-continuous diagnostic instrument, includes target taking-off light module, interference module and record module, its main points lie in: the recording module comprises a second beam splitter, a line imaging recording branch and a compression imaging recording branch, wherein the line imaging recording branch comprises a third lens, an inverted prism and a first optical stripe 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 stripe 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 third beam splitter and the eighth lens, between the third beam splitter and the seventh lens are equal to each other, so that the fifth lens respectively forms an optical 4f system with the sixth lens and the seventh lens respectively;
the target shooting and light receiving module directs 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;
the Doppler signal reflected light with the interference fringe movement is guided to the inversion prism through the third lens, and finally recorded by the first optical fringe camera after the Doppler signal reflected light with the interference fringe movement is rotated by the inversion prism;
the other path of Doppler signal reflected light with interference fringes is imaged to a primary image surface through a fourth lens, collimated through a fifth lens and divided into two parts through a third beam splitter, wherein one path of Doppler signal reflected light is imaged to a first spatial light modulator through a sixth lens, an image with codes reflected back by the first spatial light modulator is imaged on a second optical fringe camera with a slit fully opened through the sixth lens, the third beam splitter and an eighth lens in sequence, the other path of Doppler signal reflected light is imaged to a second spatial light modulator through a seventh lens, and the image with codes reflected back by the second spatial light modulator is imaged on the second optical fringe camera through a seventh lens, a third beam splitter and an eighth lens in sequence.
As preferable: 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, wherein a part of grid Doppler signal reflected light can pass through, and the other part of grid Doppler signal reflected light can be blocked from passing through.
With the structure, the Doppler signal reflected light has coding information after passing through, so that the target image information of which region can be clearly determined in the subsequent processing, and the original two-dimensional images of different time sections can be restored.
As preferable: the grid through which Doppler signal reflected light can pass on the mask plate of the first spatial light modulator corresponds to the grid through which Doppler signal reflected light can pass on the mask plate of the second spatial light modulator, and the grid through which Doppler signal reflected light can pass on the mask plate of the first spatial light modulator corresponds to the grid through which Doppler signal reflected light can pass on the mask plate of the second spatial light modulator.
By adopting the structure, the coded 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 accuracy of image decoding and reconstruction can be improved by combining a reconstruction decoding algorithm.
As preferable: the target shooting and 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 is imaged on the target through the optical fiber, the first lens, the first beam splitter and the second lens in sequence, doppler signal light carrying target shock wave information is reflected, and the Doppler signal light is introduced into the interference module through the second lens and the first beam splitter in sequence.
With the above structure, doppler signal light carrying target shock wave information can be obtained stably and reliably.
As preferable: the interference module comprises a second reflector, a third reflector, a fourth beam splitter and a fifth beam splitter, wherein an etalon is arranged on the third reflector, doppler signal light introduced from the targeting light receiving module is firstly split into two parts by the fourth beam splitter, one Doppler signal light is transmitted to the fifth beam splitter through the second reflector, the other Doppler signal light is transmitted to the fifth beam splitter after being delayed by the etalon on the third reflector, and the fifth beam splitter respectively transmits Doppler signal light with interference fringes to the two paths of Doppler signal light which are formed by converging, and the Doppler signal light is transmitted to the second beam splitter.
By adopting the structure, the speed change information of the reflecting surface to be detected of the target can be stably and controllably converted into the movement of interference fringes, so that the brightness change is formed, and finally, the brightness change is easy to record.
As preferable: the interference module further comprises a first reflecting mirror, and Doppler signal light emitted from the targeting light receiving module is reflected by the first reflecting mirror and then emitted to the fourth beam splitter.
With the above structure, the propagation path of light can be simply and reliably changed to better utilize the field.
As preferable: the slit of the second optical stripe camera is completely opened.
By adopting the structure, more information can be recorded, and the diagnosis of the two-dimensional shock wave velocity field can be better realized in a matching way.
Compared with the prior art, the invention has the beneficial effects that:
according to the two-dimensional shock wave speed field quasi-continuous diagnostic instrument adopting the technical scheme, through the design of the two diagnostic branches of the linear imaging recording branch and the compression imaging recording branch, the linear imaging recording branch can realize the diagnosis of the evolution process of the one-dimensional shock wave speed field, the compression imaging recording branch adopts the two-channel complementary coding to be combined with the stripe camera, so that the diagnosis of the two-dimensional shock wave speed field is realized, wherein the reverse prism in the rotation linear imaging recording branch can select different chord tangent directions of the shock wave speed field to be detected for diagnosis, the scanning verification of the two-dimensional speed field diagnosis of the compression imaging recording branch is realized by combining with the high-precision one-dimensional speed field evolution information, the restoring precision of the two-dimensional dynamic information is improved, and the high-precision diagnosis of the two-dimensional shock wave speed field is further completed; therefore, the invention is obviously superior to the one-dimensional VISAR which can only measure the transmission process of the shock wave speed in one-dimensional space, and is obviously superior to the 2D-VISAR which can only obtain the shape of the shock wave at one time point.
Drawings
FIG. 1 is a schematic view of the optical path of a two-dimensional shockwave velocity field quasi-continuous diagnostic instrument;
FIG. 2 is a schematic diagram of a binary code board.
Detailed Description
The invention is further described below with reference to examples and figures.
As shown in FIG. 1, a 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 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 focus of probe light laser 4 is located the one end of optic fibre 5, and the focus of first lens L1 is located the other end of optic fibre 5. The driving light laser 3 emits ultrashort pulse laser to the target surface to be detected of the target 2, and 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 reflected back to Doppler signal light carrying shock wave information of the target 2, wherein the shock wave information of the target 2 carried by the Doppler signal light is shock wave front speed change information. Finally, doppler signal light carrying the shock wave 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, the etalon E is used for playing a role in time delay so as to change the travel time difference of two paths of light, and speed change information of a reflecting surface to be measured of the target 2 can be converted into movement of interference fringes based on Doppler effect.
Specifically, the Doppler signal light introduced from the target shooting and light receiving module is firstly split into two parts by the fourth beam splitter BS4, one Doppler signal light is emitted to the fifth beam splitter BS5 by the second reflector M2, the other Doppler signal light is emitted to the fifth beam splitter BS5 after delayed by the etalon E on the third reflector M3, and the fifth beam splitter BS5 gathers the two paths of incident Doppler signal light to form one Doppler signal light with interference fringe movement, so that the speed change information of the reflecting surface of the target 2 carried by the Doppler signal light is converted into the movement of the interference fringe, and finally the movement is recorded by the recording module.
Further, the interference module further includes a first reflector M1, and the doppler signal light emitted from the targeting light receiving module is reflected by the first reflector M1 and then is emitted to the fourth beam splitter BS4, so that the propagation path of the light can be simply and reliably changed, and 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 interference fringe movement is split into two parts by the second beam splitter BS2, one part is led into the imaging recording branch, and the other part is led into the compression imaging recording branch.
The line imaging recording branch circuit comprises a third lens L3, an inversion prism 1 and a first optical stripe camera C1, wherein Doppler signal reflected light with interference stripe movement, which is emitted by a second beam splitter BS2, is guided to the inversion prism 1 through the third lens L3, and finally recorded by the first optical stripe camera C1 after the Doppler signal reflected light with interference stripe movement is rotated by the inversion prism 1. Because the inverted prism 1 is arranged in the linear imaging recording branch, the selection of different chord tangent angle directions can be realized by rotating the inverted prism 1, so that diagnosis can be carried out on different chord tangent directions of a to-be-detected shock wave velocity field, and therefore, the scanning verification of the two-dimensional velocity field diagnosis of the compression imaging recording branch can be realized by combining with the high-precision one-dimensional velocity field evolution information, and the 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 respectively provided with a binary code plate, and the distances between the third beam splitter BS3 and the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are equal, so that the fifth lens L5, the sixth lens L6, the seventh lens L7 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 fringes emitted by the second beam splitter BS2 is imaged to the primary image plane IP through the fourth lens L4, collimated through the fifth lens L5 and then split into two parts by the third beam splitter BS3, wherein one path of Doppler signal reflected light is imaged to the first spatial light modulator DMD1 through the sixth lens L6, the coded image reflected by the first spatial light modulator DMD1 is imaged to the second optical fringe camera C2 with the fully opened slit after passing through the sixth lens L6, the third beam splitter BS3 and the eighth lens L8 in sequence, the other path of Doppler signal reflected light is imaged to the second spatial light modulator DMD2 through the seventh lens L7, and the coded image reflected by the second spatial light modulator DMD2 is imaged to the second optical fringe camera C2 after passing through the seventh lens L7, the third beam splitter BS3 and the eighth lens L8 in sequence.
In the compressed imaging recording branch, firstly, two paths of interference patterns are respectively sampled by using binary coding plates of a first spatial light modulator DMD1 and a second spatial light modulator DMD2, then each interference pattern sampled by coding is imaged to a slit of a second optical fringe camera C2, and two-dimensional resolution recording of each interference pattern after coding is completed. When the second optical stripe camera C2 operates dynamically, each encoded interference pattern is shifted and overlapped, compression recording is carried out on the CCD of the second optical stripe camera C2, then decompression of the compressed image is completed through iterative calculation by utilizing a binary coding plate, each two-dimensional interference pattern is obtained, and then speed information is obtained through decompression, so that the speed transmission process of the two-dimensional shock wave front can be obtained. And finally, carrying out proper integral operation on the two-dimensional shock wave speed to obtain a quasi-continuous transmission process of the appearance of the two-dimensional shock wave front. Meanwhile, in order to reduce loss of effective information in the encoding and compression process, the embodiment designs a double-channel complementary sampling light path, and can further improve the recovery precision of two-dimensional dynamic information by matching with a complementary decoding technology.
In this embodiment, the slit of the second optical stripe camera C2 is completely opened, so that the slit of the second optical stripe camera C2 is rectangular, and two-dimensional resolution recording of each encoded interference pattern can be simply and reliably achieved.
Further, the first spatial light modulator DMD1 and the second spatial light modulator DMD2 are digital micromirror arrays, the binary code plate is a mask plate integrated on the digital micromirror arrays, and the mask plate is provided with grids a arranged in a matrix mode, wherein a part of Doppler signal reflected light of the grids a can pass through, and the other part of Doppler signal reflected light can be blocked from passing through by the grids a. In addition, the gold can well block Doppler signal reflected light, and the gold plating mode is simple in process and convenient to manufacture, so that the part of the grid a which can block Doppler signal reflected 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 the encoding compression result E (x, y) of the two-dimensional interference pattern by using the compression imaging recording branch
E(x，y)＝TSCI(x，y，t) (1)
In the formula (1), E (x, y) is a two-dimensional image recorded on the CCD of the second optical stripe camera C2 after offset compression, 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 stripe camera C2, and T is a superposition recording operation of the CCD of the second optical stripe camera C2.
To solve the above equation in reverse to obtain two-dimensional interference pattern evolution data I (x, y, t), it is generally translated into a minimum solution of the following equation:
in equation (2), λ is a regularization parameter, and Φ is a regularization function.
Each frame of two-dimensional interference pattern I (x, y, t) is decompressed from the compressed pattern by iterative computation. The interference fringe variation process I (x, y) of the one-dimensional space can be extracted through each interference image I (x, y, t) 0 T) and then solving for the velocity profile v (x, y) 0 By using the method, the speed change process of each one-dimensional space can be solved, and then the speed 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 front 0 ) By varying the time of the two-dimensional shock wave velocityAnd integrating the intermediate points to obtain the two-dimensional shock wave wavefront morphology P (x, y, t) of each time point.
The two-channel complementary sampling light paths are designed in the compressed 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 be blocked on a mask plate of the second spatial light modulator DMD2, and a grid a through which Doppler signal reflected light can be blocked 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 encoding 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 description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides a two-dimensional shock wave velocity field quasi-continuous diagnostic instrument, includes target shooting receipts optical module, interference module and record module, its characterized in that: the recording module comprises a second beam splitting mirror (BS 2), a line imaging recording branch and a compression imaging recording branch, wherein the line imaging recording branch comprises a third lens (L3), an inverted prism (1) and a first optical stripe camera (C1), the compression imaging recording branch comprises a third beam splitting mirror (BS 3), 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 (DMD 1), a second spatial light modulator (DMD 2) and a second optical stripe camera (C2), binary coding plates are arranged on the first spatial light modulator (DMD 1) and the second spatial light modulator (DMD 2), and the distances between the third beam splitting mirror (BS 3) and the fifth lens (L5), between the sixth lens (L6) and the seventh lens (L7) and between the eighth lens (L8) are all equal, so that the fifth lens (L5) and the seventh lens (L6) and the seventh lens (L7) and the eighth lens (L8) respectively form a system of optical stripe cameras (L7 and L7 respectively;
the target shooting and light receiving module directs 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 the second beam splitter (BS 2);
the Doppler signal reflected light with the movement of the interference fringes is guided to the inverted prism (1) through the third lens (L3), and finally recorded by the first optical fringe camera (C1) after the Doppler signal reflected light with the movement of the interference fringes is rotated by the inverted prism (1);
the other path of Doppler signal reflected light with interference fringes is imaged to a primary Image Plane (IP) through a fourth lens (L4), collimated through a fifth lens (L5), split into two parts through a third beam splitter (BS 3), wherein one path of Doppler signal reflected light is imaged to a first spatial light modulator (DMD 1) through a sixth lens (L6), the coded image reflected by the first spatial light modulator (DMD 1) is imaged on a second optical fringe camera (C2) with a fully opened slit through the sixth lens (L6), the third beam splitter (BS 3) and an eighth lens (L8) in sequence, the other path of Doppler signal reflected light is imaged on the second spatial light modulator (DMD 2) through a seventh lens (L7), and the coded image reflected by the second spatial light modulator (DMD 2) is imaged on the second optical fringe camera (C2) through the seventh lens (L7), the third beam splitter (BS 3) and the eighth lens (L8) in sequence.
2. A two-dimensional shockwave velocity field quasi-continuous diagnostic instrument according to claim 1 wherein: the first spatial light modulator (DMD 1) and the second spatial light modulator (DMD 2) are both digital micro-mirror arrays, the binary coding plate is a mask plate integrated on the digital micro-mirror arrays, grids (a) arranged in a matrix mode are arranged on the mask plate, one part of the grids (a) can pass Doppler signal reflected light, and the other part of the grids (a) can block Doppler signal reflected light.
3. A two-dimensional shockwave velocity field quasi-continuous diagnostic instrument according to claim 2 wherein: the grid (a) capable of allowing Doppler signal reflected light to pass through on the mask plate of the first spatial light modulator (DMD 1) corresponds to the grid (a) capable of blocking Doppler signal reflected light to pass through on the mask plate of the second spatial light modulator (DMD 2), and the grid (a) capable of blocking Doppler signal reflected light to pass through on the mask plate of the first spatial light modulator (DMD 1) corresponds to the grid (a) capable of allowing Doppler signal reflected light to pass through 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 target shooting and light receiving module comprises a first beam splitter (BS 1), 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) is imaged on the target (2) through the optical fiber (5), the first lens (L1), the first beam splitter (BS 1) and the second lens (L2) in sequence, and Doppler signal light carrying shock wave information of the target (2) is reflected back, and is led into the interference module through the second lens (L2) and the first beam splitter (BS 1) in sequence.
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 (BS 4) and a fifth beam splitter (BS 5), wherein an etalon (E) is arranged on the third reflecting mirror (M3), doppler signal light introduced from the targeting light receiving module is firstly split into two parts by the fourth beam splitter (BS 4), one path of Doppler signal light is transmitted to the fifth beam splitter (BS 5) through the second reflecting mirror (M2), the other path of Doppler signal light is transmitted to the fifth beam splitter (BS 5) after being delayed by the etalon (E) on the third reflecting mirror (M3), and the fifth beam splitter (BS 5) respectively transmits a path of Doppler signal light with interference fringes for moving formed by converging the two paths of 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 further 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) and then 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 completely opened.
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|---|---|---|---|---|
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