Wide-angle VISAR spherical cavity target assembly error simulation device

Abstract

The invention discloses a wide-angle VISAR spherical cavity target assembly error simulation device, comprising a spherical cavity and an ellipsoidal mirror, wherein one end of the spherical cavity is provided with a cone, and the other end is provided with a mounting port, the ellipsoidal mirror is supported in the spherical cavity by a horizontal connecting rod extending from the mounting port, the far end of the horizontal connecting rod is connected with an ellipsoidal mirror support assembly, the spherical cavity is supported on the target cavity support assembly, the ellipsoidal mirror support assembly is provided with a two-dimensional translation mechanism, which can drive the ellipsoidal mirror support assembly and the ellipsoidal mirror to perform two-dimensional translation along a horizontal plane, and the target cavity support assembly is provided with a lifting and rotating mechanism, which can drive the target cavity support assembly and the spherical cavity to lift and rotate. The invention can change the relative position relationship between the ellipsoidal mirror and the spherical cavity in a controllable manner, thereby simulating various possible assembly errors of the ellipsoidal mirror, so as to evaluate the influence of different assembly errors on the measurement accuracy, and provide a reference basis for improving the imaging quality and imaging accuracy of wide-angle VISAR.

Description

Technical Field

[0001] The invention belongs to the technical field of laser measurement and relates to a wide-angle VISAR spherical cavity target assembly error simulation device. Background Art

[0002] As non-renewable energy sources gradually run out, humans may face a serious energy crisis in the future. In order to get out of this predicament, the development and utilization of nuclear energy is an important solution. For atomic nuclei, both heavy nuclear fission and light nuclear fusion can release a lot of energy. At present, nuclear power plants that use fission reactions to generate electricity have been updated for many generations, but many major nuclear safety accidents have also occurred, such as the Chernobyl, Three Mile Island, and Fukushima nuclear accidents. The radioactive waste generated by the accidents has had a great impact on the environment and ecology, and has also caused many people to fear nuclear energy. Nuclear fusion has greater energy release, but does not produce strong radioactive risks like fission reactors. It is a safer way to use nuclear energy.

[0003] Laser fusion is an important way to achieve controlled nuclear fusion. For fusion ignition, the change in implosion symmetry can reflect the direction of fusion compression evolution, as well as the driving symmetry and fluid dynamics stability, and is an important form of describing implosion performance. The VISAR system used to diagnose implosion symmetry can generate interference patterns based on the signal light carrying Doppler frequency shift information reflected by the wavefront, and obtain the velocity information of the shock wave by reading the movement of the fringes in the recorded pattern, thereby realizing the diagnosis of the velocity change of the shock wave within nanoseconds after laser ignition, providing data support for precise implosion compression symmetry research.

[0004] In recent years, VISAR technology has been continuously developed. By setting up ellipsoid mirrors in laser fusion target capsules, the sampling method of traditional VISAR has been improved, and the transformation of shock wave velocity sampling from multi-point and line to 3D spherical surface has been realized. However, since wide-angle VISAR can measure 3D target surface information under certain optical path conditions, it puts higher requirements on the assembly relationship between the ellipsoid mirror and the spherical cavity; in addition, the processing error of the ellipsoid mirror will also have a great impact on the imaging quality. Therefore, evaluating the impact of the ellipsoid mirror assembly error on the wide-angle VISAR image surface is of great significance for improving the imaging quality and imaging accuracy of wide-angle VISAR. Summary of the invention

[0005] In view of this, the present invention provides a wide-angle VISAR spherical cavity target assembly error simulation device, which simulates the assembly error between the ellipsoidal mirror and the spherical cavity target and studies the influence of the assembly error between the spherical cavity and the ellipsoidal mirror on the measurement accuracy, so as to improve the wide-angle VISAR imaging quality and imaging accuracy, and reduce or even eliminate the technical problem that the wide-angle VISAR image surface is deformed due to the assembly error, thereby causing difficulty in tracking the shock wave velocity information on the target surface.

[0006] To achieve the above purpose, the technical solution of the present invention is as follows:

[0007] A wide-angle VISAR spherical cavity target assembly error simulation device comprises a spherical cavity and an ellipsoidal mirror, wherein one end of the spherical cavity is provided with a cone, and the other end is provided with a mounting port, the ellipsoidal mirror is supported in the spherical cavity by a horizontal connecting rod extending from the mounting port, the far end of the horizontal connecting rod is connected with an ellipsoidal mirror support assembly, the spherical cavity is supported on the target cavity support assembly, the ellipsoidal mirror support assembly is provided with a two-dimensional translation mechanism, which can drive the ellipsoidal mirror support assembly and the ellipsoidal mirror to perform two-dimensional translation along a horizontal plane, and the target cavity support assembly is provided with a lifting and rotating mechanism, which can drive the target cavity support assembly and the spherical cavity to lift and rotate.

[0008] According to the above structure, the two-dimensional translation mechanism and the lifting and rotating mechanism are connected respectively through the ellipsoidal mirror support assembly and the target cavity support assembly to change the relative position relationship between the ellipsoidal mirror and the spherical cavity, thereby achieving the purpose of simulating assembly errors. The probe laser is injected from the cone, and when the spherical cavity and the ellipsoidal mirror are in different positional relationships, different fringe patterns are shown in the VISAR imaging system, so that the imaging law can be judged according to the positional relationship between the pattern and the setting, which is convenient for debugging the test system, thereby improving the measurement accuracy.

[0009] Preferably, the horizontal connecting rod is provided with a sliding baffle, which can slide along the connecting rod and close the installation opening.

[0010] According to the above structure, during the test process, the sliding baffle can be used to block the light to prevent the light from being emitted through the installation opening.

[0011] Preferably, the sliding baffle includes a metal slider and a flexible disk coupled to one end surface of the metal slider, the metal slider is provided with a sliding hole that slides with the horizontal connecting rod, the flexible disk faces one side of the spherical cavity, and presents an arc surface structure adapted to the outer wall of the spherical cavity, thereby ensuring that during the test process, the sliding baffle can always close the installation port to prevent light overflow and stray light from entering.

[0012] Preferably, the upper end of the target cavity support assembly has a bracket for receiving the spherical cavity, and the ellipsoid mirror support assembly includes a vertical connecting rod arranged vertically, and the vertical connecting rod is connected to the end of the horizontal connecting rod through a right-angle joint. With this design, the installation position of the spherical cavity and the ellipsoid mirror can be better guaranteed, and the device can be conveniently installed on the test platform as a whole.

[0013] Preferably, the lower end of the vertical connecting rod is detachably mounted with an ellipsoidal mirror support, the upper end of the ellipsoidal mirror support has a hollow tubular portion to form an inner hole for the vertical connecting rod to extend into, the outer wall of the tubular portion is provided with threads, and has a notch that passes through the inner hole, the vertical connecting rod is fixed to the inner hole by a first locking nut sleeved on the tubular portion, the lower end of the bracket is provided with a target cavity support consistent with the structure of the ellipsoidal mirror support, and the bracket is locked to the target cavity support by a second locking nut. With the above structure, assembly can be performed flexibly and conveniently, and it is also more convenient to adjust the relative position of the spherical cavity and the ellipsoidal mirror.

[0014] Preferably, the two-dimensional translation mechanism includes a lateral movement motor and a longitudinal movement motor disposed at the lower end of the ellipsoidal mirror support, the longitudinal movement motor is mounted on the lateral movement motor, the lifting and rotating mechanism includes a rotating motor and a lifting motor disposed at the lower end of the target cavity support, the lifting motor is arranged on the rotating motor, and the lateral movement motor, the longitudinal movement motor, the rotating motor and the lifting motor are all stepping motors. Relying on the above-mentioned two-dimensional translation mechanism and the lifting and rotating mechanism, the movement step length can be reliably controlled, and the simulation of the ellipsoidal mirror assembly error can be realized relatively easily.

[0015] Beneficial effects:

[0016] The wide-angle VISAR spherical cavity target assembly error simulation device using the above technical solution can change the relative position relationship between the ellipsoidal mirror and the spherical cavity in a controllable manner, thereby simulating various possible assembly errors of the ellipsoidal mirror, so as to evaluate the impact of different assembly errors on measurement accuracy and provide a reference for improving wide-angle VISAR imaging quality and imaging accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 This is a three-dimensional diagram of the present invention after some structures are hidden;

[0019] Figure 3 It is a structural schematic diagram of the sliding baffle in the present invention;

[0020] Figure 4 It is a structural schematic diagram of the ellipsoidal mirror support in the present invention. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with embodiments and drawings. The following implementation modes are examples for illustrating the present invention, but the present invention is not limited to the implementation modes.

[0022] like Figure 1 and Figure 2As shown, a wide-angle VISAR spherical cavity target assembly error simulation device includes a spherical cavity 1 and an ellipsoidal mirror 2, which are respectively used to simulate the spherical cavity and ellipsoidal mirror in the VISAR system. The spherical cavity and ellipsoidal mirror actually used in the VISAR system or similar structures can be adopted, wherein the spherical cavity 1 is formed by two upper and lower hemispherical shells that are interlocked with each other, and holes are opened on both sides. A cone cylinder 11 is provided at one end located on the right side of the figure, which is used to guide the probe laser into the spherical cavity 1, and a mounting opening 12 is formed at the other end of the spherical cavity 1 that is opposite to the cone cylinder 11, and the ellipsoidal mirror 2 is supported in the spherical cavity 1 by a horizontal connecting rod 3 that extends horizontally from the mounting opening 12.

[0023] Ellipsoid mirror 2 is an aluminum ellipsoid with mirror reflection on its surface. According to the geometric optical relationship of wide-angle VISAR, the surface curve of ellipsoid mirror 2 satisfies the equation

[0024]

[0025] Among them, k and m are the parameters of the ellipsoidal mirror.

[0026] The spherical cavity 1 is supported by the target cavity support assembly 5, the left end of the horizontal connecting rod 3 extends out of the mounting port 12 and is connected to the ellipsoidal mirror support assembly 4, a bracket 51 is provided at the upper end of the target cavity support assembly 5, the bracket 51 is an arc surface structure adapted to the outer wall of the spherical cavity 1, and the spherical cavity 1 is supported by receiving part of the outer wall of the spherical cavity 1 at the lower end, the lower end of the bracket 51 is connected to the target cavity support 52, and a lifting and rotating mechanism composed of a rotating motor 54 and a lifting motor 55 is arranged at the lower end of the target cavity support 53, through which the target cavity support assembly 5 and the spherical cavity 1 can be driven to perform lifting and rotating movements. In this embodiment, the lifting motor 55 is arranged on the rotating motor 54. When the rotating motor 54 is working, it can drive the lifting motor 55, the target cavity support assembly 5 and the spherical cavity 1 to rotate together with the center line of the bracket 51 as the rotation axis. When the lifting motor 55 is working, the installation height of the spherical cavity 1 can be adjusted, thereby realizing the adjustment of the relative height and spatial angle between the spherical cavity 1 and the ellipsoidal mirror 2, and realizing the simulation of the height and angle installation errors of the ellipsoidal mirror 2. Figure 1 The arrows on the right show the direction of movement when adjusting the height and angle.

[0027] Since the spherical cavity 1 is spherical, it should be understood that the change in spatial angle during its rotation is also equivalent to the change during the pitch adjustment of the spherical cavity 1. Therefore, by rotating the spherical cavity 1, the installation error of the spherical cavity 1 and the ellipsoidal mirror 2 in the pitch condition can also be simulated.

[0028] The ellipsoidal mirror support assembly 4 includes a vertically arranged vertical connecting rod 41, which is connected to the left end of the horizontal connecting rod 3 through a right-angle joint 42, so that the ellipsoidal mirror support assembly 4 supports the ellipsoidal mirror 2 in a posture parallel to the target cavity support assembly 5, and the height roughly meets the installation position requirements of the ellipsoidal mirror 2, so that the error simulation device as a whole can be conveniently fixed to the test platform.

[0029] The lower end of the vertical connecting rod 41 is connected to a two-dimensional translation mechanism through the ellipsoid mirror support 43, which can drive the ellipsoid mirror support assembly 4, the horizontal connecting rod 3 and the ellipsoid mirror 2 to perform two-dimensional translation along the horizontal plane, that is, along Figure 1 The image is translated in the left and right directions and in the direction perpendicular to the surface of the graphic, as shown by the arrow on the left side of the figure.

[0030] In this embodiment, the two-dimensional translation mechanism includes a transverse moving motor 44 and a longitudinal moving motor 45 arranged at the lower end of the ellipsoidal mirror support 43. The longitudinal moving motor 45 is installed on the transverse moving motor 44. In other embodiments, the installation positions of the transverse moving motor 44 and the longitudinal moving motor 45 can also be interchanged.

[0031] The lateral moving motor 44, the longitudinal moving motor 45, the rotating motor 54 and the lifting motor 55 are all stepping motors, so as to control the movement step length and simulate the set assembly error value as needed.

[0032] A sliding baffle 6 is slidably mounted on the horizontal connecting rod 3 to shield the mounting opening 12 during the test to prevent light from being emitted from the mounting opening 12 or other interfering stray light from entering from the mounting opening 12 .

[0033] Figure 3 The specific structure of the sliding baffle 6 is shown, which includes a metal slider 61 and a flexible disk 62 fixed to one end face of the metal slider 61 by, for example, welding. The metal slider 61 is a cylindrical structure, and a sliding hole 6a is provided in the axial middle part for sliding cooperation with the horizontal connecting rod 3. The flexible disk 62 is made of flexible materials such as rubber, and has an arc surface structure adapted to the outer wall of the spherical cavity 1.

[0034] To facilitate installation and disassembly of the device, in this embodiment, the bracket 51 and the target cavity support 52, and the vertical connecting rod 41 and the ellipsoidal mirror support 43 are all connected in a detachable manner.

[0035] Figure 4It is a schematic diagram of the three-dimensional structure of the ellipsoidal mirror support 43. It can be seen that the upper end of the ellipsoidal mirror support 43 has a tubular portion 431 with a hollow tubular structure, and forms an inner hole 43a with an open upper end for the lower end of the vertical connecting rod 41 to extend into. The outer wall of the tubular portion 431 is processed with an external thread, and grooves 43b that pass through the inner hole 43a are opened on both sides of the tubular portion 431, so that the tubular portion 431 has a certain deformation ability. After the vertical connecting rod 41 is inserted, the lower end of the vertical connecting rod 41 can be locked in the inner hole 43a by using the first locking nut 432. In order to ensure the fixing effect, the tubular portion 431 can also have an appropriate taper.

[0036] The target cavity support 52 can adopt the same or similar structure as the ellipsoidal mirror support 43 . In this embodiment, the target cavity support 52 has the same structure as the ellipsoidal mirror support 43 , and the lower end of the bracket 51 is locked to the target cavity support 52 by a second locking nut 53 .

[0037] With the help of the above design, the wide-angle VISAR spherical cavity target assembly error simulation device can simulate the assembly position error relationship of the ellipsoidal mirror in the spherical cavity, and realize the error simulation in four dimensions of X, Y, Z and rotation, so as to obtain the imaging law under different assembly errors, which provides important support for interpreting wide-angle VISAR imaging and improving measurement accuracy.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A wide-angle VISAR spherical cavity target assembly error simulation device, comprising a spherical cavity (1) and an ellipsoidal mirror (2), characterized in that: The spherical cavity (1) is provided with a cone (11) at one end and a mounting opening (12) at the other end; the ellipsoidal mirror (2) is supported in the spherical cavity (1) by a horizontal connecting rod (3) extending from the mounting opening (12); the far end of the horizontal connecting rod (3) is connected to an ellipsoidal mirror support assembly (4); the spherical cavity (1) is supported on a target cavity support assembly (5); the ellipsoidal mirror support assembly (4) is provided with a two-dimensional translation mechanism capable of driving the ellipsoidal mirror support assembly (4) and the ellipsoidal mirror (2) to perform two-dimensional translation along a horizontal plane; the target cavity support assembly (5) is provided with a lifting and rotating mechanism capable of driving the target cavity support assembly (5) and the spherical cavity (1) to lift and rotate; The horizontal connecting rod (3) is provided with a sliding baffle (6), and the sliding baffle (6) is capable of sliding along the horizontal connecting rod (3) and closing the installation opening (12); The target cavity support assembly (5) has a bracket (51) at its upper end for receiving the spherical cavity (1), and the ellipsoid mirror support assembly (4) comprises a vertical connecting rod (41) arranged vertically, wherein the vertical connecting rod (41) is connected to the end of the horizontal connecting rod (3) via a right-angle joint (42); The sliding baffle (6) comprises a metal slider (61) and a flexible disk (62) coupled to an end surface of one side of the metal slider (61); the metal slider (61) is provided with a sliding hole (6a) that is slidably matched with the horizontal connecting rod (3); the flexible disk (62) faces one side of the spherical cavity (1) and presents an arc surface structure that is adapted to the outer wall of the spherical cavity (1).

2. The wide-angle VISAR spherical cavity target assembly error simulation device according to claim 1, characterized in that: The lower end of the vertical connecting rod (41) is detachably mounted with an ellipsoid mirror support (43); the upper end of the ellipsoid mirror support (43) has a hollow tubular portion (431) to form an inner hole (43a) for the vertical connecting rod (41) to extend into; the outer wall of the tubular portion (431) is provided with a thread and has a notch (43b) extending through the inner hole (43a); the vertical connecting rod (41) is fixed to the inner hole (43a) by a first locking nut (432) sleeved on the tubular portion (431); the lower end of the bracket (51) is provided with a target cavity support (52) having the same structure as the ellipsoid mirror support (43); the bracket (51) is locked to the target cavity support (52) by a second locking nut (53).

3. The wide-angle VISAR spherical cavity target assembly error simulation device according to claim 2, characterized in that: The two-dimensional translation mechanism comprises a transverse movement motor (44) and a longitudinal movement motor (45) arranged at the lower end of the ellipsoidal mirror support (43), and the longitudinal movement motor (45) is installed on the transverse movement motor (44). The lifting and rotating mechanism comprises a rotating motor (54) and a lifting motor (55) arranged at the lower end of the target cavity support (52), and the lifting motor (55) is arranged on the rotating motor (54). The transverse movement motor (44), the longitudinal movement motor (45), the rotating motor (54) and the lifting motor (55) are all stepping motors.

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