Star point energy subdivision adjusting device for dark and weak star light simulator

Abstract

A kind of star point energy subdivision adjusting device for dark and weak star light simulator is designed, mainly consisting of optical fiber I, optical fiber beam expander connector, star point energy attenuator, diaphragm position adjusting mechanism, optical fiber beam reducer connector and optical fiber II, the subdivision adjustment of star point energy is realized under the premise of not affecting the spectral characteristics of simulation and not reducing the stability of light source by star point energy attenuator.At the same time, the position of light beam propagation path relative to diaphragm is controlled by optical fiber beam expander connector, diaphragm position adjusting mechanism and optical fiber beam reducer connector, so as to improve the adjustment range and subdivision precision of star point energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of dim starlight simulator, in particular to a star point energy subdivision adjustment device for dim starlight simulator. BACKGROUND

[0002] The dim starlight simulator can realize the real simulation of dim star point size, star magnitude, spectral characteristics under laboratory conditions by using star point board, collimating optical system, light source and appropriate filter. It is one of the important guarantee devices for ground simulation experiment and calibration in the development of optical sensor, which is a key equipment for high-precision detection of dim target.

[0003] From the existing research results, there are still many problems in the study of star point energy adjustment of dim starlight simulator. Adjusting the power of the light source is the most commonly used method for star point energy adjustment of starlight simulator. However, the change of light source power will affect the stability and spectral characteristics of dim star point simulation, thereby reducing the star magnitude accuracy and spectral matching degree of dim starlight simulator. Another method for adjusting star point energy is to use neutral filter. Although this method improves the instability of energy distribution at low power of the light source, the doping and coating process of the filter is complex and expensive, and it will affect the spectral distribution of the light beam.

[0004] In order to realize the subdivision of star point energy of dim starlight simulator, it is necessary to study a more stable and easy-to-control star point energy subdivision device for dim starlight simulator, so as to avoid the influence of changing the power of the light source or adding the neutral filter on the stability and spectral matching degree of dim starlight simulator, and to realize the high-precision continuous subdivision adjustment of star point energy without affecting the simulation spectral characteristics and reducing the stability of the light source. SUMMARY

[0005] In order to solve the problems existing in the prior art, a star point energy subdivision adjustment device for dim starlight simulator is designed.

[0006] For the dim starlight simulator composed of light source, condensing system, transmission optical fiber, star point board and parallel light tube, a fiber I, fiber expansion connector, star point energy attenuator, diaphragm position adjustment mechanism, fiber collection connector and fiber II are designed for star point energy subdivision adjustment. Without changing the power of the light source and without adding the neutral filter, the star point energy attenuator is used to adjust the transmission energy of the optical fiber, and the fiber expansion connector, the diaphragm position adjustment mechanism and the fiber collection connector are used to control and align the light beam propagation path, so as to realize the high-precision continuous subdivision adjustment of star point energy without affecting the simulation spectral characteristics and reducing the stability of the light source.

[0007] The technical solution adopted by the present invention to solve the problems of the prior art is: designing a star point energy subdivision device for a faint starlight simulator, including the optical fiber I, the optical fiber expansion connector, the star point energy attenuator, the aperture position adjustment mechanism, the optical fiber take-up connector and the optical fiber II.

[0008] The dim starlight simulator consists of a light source, a focusing system, a transmission optical fiber, a star point plate, and a collimator. The light source is located at the front end of the focusing system, the focusing system is located at the front end of the transmission optical fiber, the star point plate is located at the rear end of the transmission optical fiber, and the collimator is located at the rear end of the star point plate.

[0009] To achieve the fine-grained adjustment of star point energy in the dim starlight simulator, and to achieve a more refined adjustment range by controlling and aligning the beam path, a star point energy fine-grained adjustment device is designed and placed between the focusing system and the star point plate, replacing the transmission optical fiber; optical fiber I is placed at the rear end of the light source, and optical fiber II is placed at the front end of the star point plate.

[0010] The fiber optic beam expander connector includes the beam expander lens and the beam expander lens pose adjustment mechanism; the star point energy attenuator includes the star point energy attenuator connector and the teardrop-shaped aperture stop; the fiber optic beam convergence connector includes the converging lens and the beam convergence lens pose adjustment mechanism.

[0011] The star point energy subdivision adjustment device for a faint starlight simulator is arranged from front to back as follows: fiber 1, fiber expander connector, star point energy attenuator, aperture position adjustment mechanism, fiber take-up connector, and fiber 2. The expander lens is fixed inside the expander lens attitude adjustment mechanism, the teardrop-shaped aperture is fixed inside the aperture position adjustment mechanism, and the converging lens is fixed inside the take-up lens attitude adjustment mechanism. The rear end of fiber 1 is connected to the front end of the expander lens attitude adjustment mechanism, the rear end of the expander lens attitude adjustment mechanism is connected to the front end of the star point energy attenuator connector, the aperture position adjustment mechanism is fixed to the rear end of the star point energy attenuator connector, the take-up lens attitude adjustment mechanism is placed behind the aperture position adjustment mechanism and connected to the rear end of the star point energy attenuator connector, and the rear end of the take-up lens attitude adjustment mechanism is connected to fiber 2.

[0012] The optical fiber I is used to transmit unregulated light source energy from the focusing system.

[0013] The beam-expanding lens of the fiber optic beam expander connector is used to expand the diameter of the beam emitted from fiber I to an aperture diameter D not less than the maximum luminous flux position of the teardrop-shaped aperture stop, and collimate it into parallel light; the optical axis of the beam expander lens coincides with the optical axis of the beam emitted from fiber I, and the focal point of the beam expander lens is at the emitting end face of fiber I; the beam expander lens posture adjustment mechanism is used to accommodate the beam expander lens and adjust its posture, and also serves to connect fiber I and the star point energy attenuator.

[0014] The initial position of the teardrop-shaped aperture stop of the star point energy attenuator is the maximum luminous flux position. Here, the aperture diameter of the teardrop-shaped aperture stop is D, the maximum luminous flux is M, and the center of the aperture coincides with the optical axis of the parallel light before attenuation. During the rotation of the teardrop-shaped aperture stop, there are a total of G stops. The parallel light before attenuation always covers the light-transmitting aperture of the teardrop-shaped aperture stop, thereby continuously changing the area of ​​the light-transmitting aperture. This reduces the diameter of the beam passing through the teardrop-shaped aperture stop from D to 0 after G adjustments, and achieves the attenuation of the parallel light flux from M to 0 after G adjustments. The star point energy subdivision accuracy is M / G. At the same time, the outer surface of the teardrop-shaped aperture stop is coated with black paint with a reflectivity of less than 1% to reduce the generation of stray light. The star point energy attenuator connector is used to fix the aperture position adjustment mechanism and connects the fiber optic expander connector and the fiber optic take-up connector.

[0015] The aperture position adjustment mechanism is fixed after the star point energy attenuator connector, and its front end is fastened to the teardrop-shaped small aperture aperture, which is used to adjust the position of the teardrop-shaped small aperture aperture relative to the beam expander lens.

[0016] The converging lens of the fiber optic cable convergence connector is used to converge the attenuated parallel light from the star point energy attenuator into the fiber II; the optical axis of the converging lens coincides with the optical axis of the attenuated parallel light and the focal point of the converging lens is at the incident end face of the fiber II; the cable convergence lens posture adjustment mechanism is used to accommodate the converging lens and adjust the posture of the converging lens, and at the same time serves to connect the star point energy attenuator and the fiber II.

[0017] The optical fiber II is used to transmit the subdivided and adjusted star point energy and output it to the star point plate;

[0018] A method for subdividing star energy in a faint starlight simulator is disclosed, utilizing a star energy subdivision device for a faint starlight simulator. In use, the input end face of fiber optic cable I is first placed at the input end face of the transmission fiber in the faint starlight simulator, i.e., the focal plane of the focusing system. Then, the fiber optic beam expander connector is placed at the rear end of fiber optic cable I. The beam expander lens pose adjustment mechanism controls the six-dimensional pose adjustment of the beam expander lens (x, y, z and α, β, γ) to adjust the focal point of the beam expander lens to the center of the output end face of fiber optic cable I, while simultaneously adjusting the optical axis of the beam expander lens to be perpendicular to the center of the output end face of fiber optic cable I. Next, a teardrop-shaped aperture is placed in the star energy attenuator connector and fixed to the star energy attenuator connector using the aperture position adjustment mechanism. The adjustment mechanism controls the position of the teardrop-shaped aperture stop within its two-dimensional plane, ensuring that the parallel light emitted from the beam expander lens is perpendicular to the aperture stop, and maintaining the parallel light covering the aperture throughout the aperture's rotation. Next, the fiber optic take-up connector is placed behind the aperture position adjustment mechanism, and the take-up lens pose adjustment mechanism controls the six-dimensional pose adjustment of the converging lens (x, y, z and α, β, γ), aligning the converging lens's optical axis with that of the beam expander lens. Finally, the fiber II is placed behind the fiber optic take-up connector, with the center of the fiber II's incident end face positioned at the focal point of the converging lens. This achieves fine-grained adjustment of the star point energy by rotating the teardrop-shaped aperture stop. According to the star point energy subdivision method for a faint starlight simulator, in use, the relative pose between the beam expander lens and the converging lens is adjusted by the beam expander lens pose adjustment mechanism and the beam converger lens pose adjustment mechanism. This allows for the offset of the optical axis of the parallel light before attenuation and the parallel light after attenuation relative to the optical axis of the aperture of the teardrop-shaped aperture. When the teardrop-shaped aperture is in its initial position, the maximum luminous flux is a times M, where a < 1. During the rotation of the teardrop-shaped aperture, there are a total of G stops. Thus, the luminous flux of the parallel light after attenuation is reduced from aM to 0 after G adjustments, and the star point energy subdivision accuracy is aM / G.

[0019] In summary, this invention provides a star point energy subdivision adjustment device for a faint starlight simulator, comprising the optical fiber I, the beam-expanding lens and beam-expanding lens pose adjustment mechanism in the optical fiber beam-expanding connector, the star point energy attenuator connector and the teardrop-shaped aperture stop in the star point energy attenuator, the aperture stop position adjustment mechanism, the converging lens in the optical fiber beam-receiving connector, the beam-receiving lens pose adjustment mechanism, and the optical fiber II. This invention's star point energy subdivision adjustment device for a faint starlight simulator avoids the impact of changing the light source power or adding a neutral density filter on the stability and spectral matching of the faint starlight simulator, achieving high-precision continuous subdivision adjustment of star point energy without affecting the simulated spectral characteristics or reducing the stability of the light source. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a faint starlight simulator according to the present invention;

[0021] Figure 2 This is a schematic diagram of the star point energy subdivision device for a faint starlight simulator according to the present invention.

[0022] Figure 3 This is a schematic diagram of the teardrop-shaped aperture of a star point energy subdivision device for a faint starlight simulator according to the present invention.

[0023] Figure label:

[0024] 1—Light source; 2—Concentrating system; 3—Transmission fiber; 31—Fiber I; 32—Fiber expander connector; 321—Expander lens posture adjustment mechanism; 322—Expander lens; 33—Star point energy attenuator; 331—Star point energy attenuator connector; 332—Teardrop-shaped aperture; 34—Aperture position adjustment mechanism; 35—Fiber convergence connector; 351—Converging lens posture adjustment mechanism; 352—Converging lens; 36—Fiber II; 4—Star point plate; 5—Coherent light tube. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be noted that similar or identical elements are referred to by the same reference numerals in the drawings or description.

[0026] Figure 1 This is a schematic diagram of the overall structure of a faint starlight simulator according to the present invention. Figure 1As shown, the dim starlight simulator consists of a light source 1, a focusing system 2, a transmission fiber optic cable 3, a star point plate 4, and a collimator 5. The light source 1 is located at the front end of the focusing system 2, the focusing system 2 is located at the front end of the transmission fiber optic cable 3, the star point plate 4 is located at the rear end of the transmission fiber optic cable 3, and the collimator 5 is located at the rear end of the star point plate 4.

[0027] Figure 2 This is a schematic diagram of the star point energy subdivision device for a faint starlight simulator according to the present invention. Figure 2 As shown, the star point energy subdivision device for a faint starlight simulator consists of fiber I 31, fiber optic expander connector 32, star point energy attenuator 33, aperture position adjustment mechanism 34, fiber optic take-up connector 35, and fiber II. Fiber optic expander connector 32 includes an expander lens 322 and an expander lens pose adjustment mechanism 321; star point energy attenuator 33 includes a star point energy attenuator connector 331 and a teardrop-shaped aperture 332; fiber optic take-up connector 35 includes a converging lens 352 and a take-up lens pose adjustment mechanism 351. The star point energy subdivision device for a faint starlight simulator is arranged from front to back as follows: fiber I 31, fiber optic expander connector 32, star point energy attenuator 33, aperture position adjustment mechanism 34, fiber optic take-up connector 35, and fiber II 36. The beam expander lens 322 is fixed inside the beam expander lens posture adjustment mechanism 321, the teardrop-shaped aperture 332 is fixed inside the aperture position adjustment mechanism 34, and the converging lens 352 is fixed inside the beam convergence lens posture adjustment mechanism 351. The rear end of fiber I is connected to the front end of the beam expander lens posture adjustment mechanism 321, the rear end of the beam expander lens posture adjustment mechanism 321 is connected to the front end of the star point energy attenuator connector 331, the aperture position adjustment mechanism 34 is fixed at the rear end of the star point energy attenuator connector 331, the beam convergence lens posture adjustment mechanism 351 is placed after the aperture position adjustment mechanism 34 and is simultaneously connected to the rear end of the star point energy attenuator connector 331, and the rear end of the beam convergence lens posture adjustment mechanism 351 is connected to fiber II.

[0028] Figure 3 This is a schematic diagram of the teardrop-shaped aperture 332 of a star point energy subdivision device for a faint starlight simulator according to the present invention. Figure 3 As shown, the teardrop-shaped pinhole aperture 332 is composed of three circular arcs with different radii: R1, R2, and D, with its rotation center at O ​​and rotation radius at R.

[0029] Fiber optic I31 is used to transmit unregulated light source energy from focusing system 2.

[0030] The beam-expanding lens 322 of the fiber optic beam expander connector 32 is used to expand the diameter of the beam emitted from the fiber I31 to an aperture diameter D that is not less than the maximum luminous flux position of the teardrop-shaped aperture stop 332, and collimate it into parallel light; the optical axis of the beam expander lens 322 coincides with the optical axis of the beam emitted from the fiber I31, and the focal point of the beam expander lens 322 is at the exit end face of the fiber I31; the beam expander lens posture adjustment mechanism 321 is used to accommodate the beam expander lens 322 and adjust its posture, and at the same time serves to connect the fiber I31 and the star point energy attenuator 33.

[0031] The initial position of the teardrop-shaped aperture 332 of the star point energy attenuator 33 is the maximum luminous flux position, with an aperture diameter of D and a maximum luminous flux of M. The center of the aperture coincides with the optical axis of the parallel light before attenuation. During the rotation of the teardrop-shaped aperture 332, there are 1000 stops. Before attenuation, the parallel light always covers the light-transmitting aperture of the teardrop-shaped aperture 332, thereby continuously changing the light-transmitting aperture area. This reduces the diameter of the beam passing through the aperture from D to 0 after 1000 adjustments, and achieves the attenuation of the parallel light flux from M to 0 after 1000 adjustments. The star point energy subdivision accuracy is 0.001M. At the same time, the outer surface of the teardrop-shaped aperture 332 is coated with black paint with a reflectivity of less than 1% to reduce the generation of stray light. The star point energy attenuator connector 331 is used to fix the aperture position adjustment mechanism 34 and connects the fiber optic bundle expander connector 32 and the fiber optic bundle take-up connector 35.

[0032] After the aperture position adjustment mechanism 34 is fixed to the star point energy attenuator connector 331, its front end is tightly connected to the teardrop-shaped small aperture 332, and is used to adjust the position of the teardrop-shaped small aperture 332 relative to the beam expander lens 322.

[0033] The converging lens 352 of the fiber optic convergence connector 35 is used to converge the attenuated parallel light after passing through the star point energy attenuator 33 into the fiber II 36; the optical axis of the converging lens 352 coincides with the optical axis of the attenuated parallel light and the focal point of the converging lens 352 is at the incident end face of the fiber II 36; the convergence lens posture adjustment mechanism 351 is used to accommodate the converging lens 352 and adjust the posture of the converging lens 352, and at the same time serves to connect the star point energy attenuator 33 and the fiber II 36.

[0034] Fiber optic II is used to transmit the subdivided and adjusted star point energy and output it to star point plate 4;

[0035] In use, first, place the input end face of fiber I31 at the input end face position of fiber 3 in the dim starlight simulator, i.e., the focusing focal plane of the focusing system 2; then, place the fiber expander connector 32 at the rear end of fiber I31, and use the expander lens pose adjustment mechanism 321 to control the six-dimensional pose adjustment of the expander lens 322 (x, y, z and α, β, γ) to adjust the focal point of the expander lens 322 to the center of the output end face of fiber I31, and at the same time adjust the optical axis of the expander lens 322 to be perpendicular to the center of the output end face of fiber I31; next, place the teardrop-shaped aperture 332 in the star point energy attenuator connector 331, and fix it to the star point energy attenuator connector 331 through the aperture position adjustment mechanism 34, and use the aperture position adjustment mechanism... The mechanism 34 controls the position of the teardrop-shaped aperture 332 within its two-dimensional plane, ensuring that the parallel light emitted from the beam expander 322 is perpendicular to the teardrop-shaped aperture 332, and maintaining the parallel light covering the aperture throughout the rotation of the teardrop-shaped aperture 332. Next, the fiber optic take-up connector 35 is placed behind the aperture position adjustment mechanism 34, and the take-up lens pose adjustment mechanism 351 controls the six-dimensional pose adjustment of the converging lens 352 (x, y, z and α, β, γ), adjusting the optical axis of the converging lens 352 to coincide with the optical axis of the beam expander 322. Finally, the fiber II 36 is placed behind the fiber optic take-up connector 35, and the center of the incident end face of the fiber II 36 is placed at the focal point of the converging lens 352. This achieves fine-tuning of the star point energy by rotating the teardrop-shaped aperture 332.

[0036] In use, by adjusting the relative pose between the beam expander lens 322 and the converging lens 352 through the beam expander lens pose adjustment mechanism 321 and the beam converger lens pose adjustment mechanism 351, the optical axis of the parallel light before and after attenuation can be offset relative to the optical axis of the aperture of the teardrop-shaped aperture stop 332. When the teardrop-shaped aperture stop 332 is in the initial position, the maximum luminous flux is 0.5 times M. During the rotation of the teardrop-shaped aperture stop 332, there are 1000 stops. Thus, the luminous flux of the parallel light after attenuation is reduced from 0.5M to 0 after 1000 adjustments, and the star point energy subdivision accuracy is 0.0005M.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A star point energy subdivision adjustment device for a faint starlight simulator, characterized in that, include: The system comprises fiber I, fiber beam expander connector, star point energy attenuator, aperture position adjustment mechanism, fiber beam take-up connector, and fiber II. The fiber beam expander connector includes a beam expander lens and a beam expander lens posture adjustment mechanism; the star point energy attenuator includes a star point energy attenuator connector and a teardrop-shaped pinhole aperture; and the fiber beam take-up connector includes a converging lens and a take-up lens posture adjustment mechanism. The star point energy subdivision device is placed between the focusing system and the star point plate of the dim starlight simulator. Fiber 1 is placed after the focusing system, and fiber 2 is placed before the star point plate. The fiber expander connector, the star point energy attenuator, the aperture position adjustment mechanism, and the fiber take-up connector are placed sequentially between fiber 1 and fiber 2 from front to back. The expander lens is fixed inside the expander lens attitude adjustment mechanism, the teardrop-shaped aperture is fixed inside the aperture position adjustment mechanism, and the converging lens is fixed inside the take-up lens attitude adjustment mechanism. The rear end of fiber 1 is connected to the front end of the expander lens attitude adjustment mechanism, the rear end of the expander lens attitude adjustment mechanism is connected to the front end of the star point energy attenuator connector, the aperture position adjustment mechanism is fixed to the rear end of the star point energy attenuator connector, the take-up lens attitude adjustment mechanism is placed after the aperture position adjustment mechanism and connected to the rear end of the star point energy attenuator connector, and the rear end of the take-up lens attitude adjustment mechanism is connected to fiber 2. The optical fiber I is used to transmit unregulated light source energy from the focusing system; The beam-expanding lens of the fiber optic beam expander connector is used to expand the diameter of the beam emitted from fiber I to an aperture diameter D not less than the maximum luminous flux position of the teardrop-shaped aperture stop, and collimate it into parallel light; the optical axis of the beam expander lens coincides with the optical axis of the beam emitted from fiber I, and the focal point of the beam expander lens is at the emitting end face of fiber I; the beam expander lens posture adjustment mechanism is used to accommodate the beam expander lens and adjust its posture, and also serves to connect fiber I and the star point energy attenuator. The initial position of the teardrop-shaped aperture stop of the star point energy attenuator is the maximum luminous flux position. Here, the aperture diameter of the teardrop-shaped aperture stop is D, the maximum luminous flux is M, and the center of the aperture coincides with the optical axis of the parallel light before attenuation. During the rotation of the teardrop-shaped aperture stop, there are a total of G stops. The parallel light before attenuation always covers the light-transmitting aperture of the teardrop-shaped aperture stop, thereby continuously changing the area of ​​the light-transmitting aperture. This reduces the diameter of the beam passing through the teardrop-shaped aperture stop from D to 0 after G adjustments, and achieves the attenuation of the parallel light flux from M to 0 after G adjustments. The star point energy subdivision accuracy is M / G. At the same time, the outer surface of the teardrop-shaped aperture stop is coated with black paint with a reflectivity of less than 1% to reduce the generation of stray light. The star point energy attenuator connector is used to fix the aperture position adjustment mechanism and connects the fiber optic expander connector and the fiber optic take-up connector. The aperture position adjustment mechanism is fixed after the star point energy attenuator connector, and its front end is fastened to the teardrop-shaped small aperture aperture, which is used to adjust the position of the teardrop-shaped small aperture aperture relative to the beam expander lens. The converging lens of the fiber optic cable convergence connector is used to converge the attenuated parallel light from the star point energy attenuator into the fiber II; the optical axis of the converging lens coincides with the optical axis of the attenuated parallel light and the focal point of the converging lens is at the incident end face of the fiber II; the cable convergence lens posture adjustment mechanism is used to accommodate the converging lens and adjust the posture of the converging lens, and at the same time serves to connect the star point energy attenuator and the fiber II. The optical fiber II is used to transmit the subdivided and adjusted star point energy and output it to the star point plate.

2. A method for subdividing star energy in a faint starlight simulator, using the star energy subdivision device for a faint starlight simulator according to claim 1, characterized in that, include: The beam expander lens posture adjustment mechanism, the aperture position adjustment mechanism, and the beam convergence lens posture adjustment mechanism are used to adjust the postures of the beam expander lens, the teardrop-shaped aperture, and the converging lens, respectively. By ensuring the consistency of the optical axis among the outgoing beam of fiber I, the fiber beam expander connector, the star point energy attenuator, the aperture position adjustment mechanism, the fiber beam convergence connector, and the incident beam of fiber II, high-precision modulation of star point energy is achieved. First, the beam-expanding lens is adjusted in six dimensions (x, y, z and α, β, γ) by the beam-expanding lens pose adjustment mechanism, so that the optical axis of the beam-expanding lens coincides with the optical axis of the beam emitted from the fiber I, and the focal point of the beam-expanding lens is at the emitting end face of the fiber I. Secondly, the position of the teardrop-shaped aperture is controlled by the aperture position adjustment mechanism in its own two-dimensional plane, so that when the teardrop-shaped aperture is in the initial position, the center of the aperture at the maximum light flux position coincides with the optical axis of the collimated parallel light, and during the rotation of the teardrop-shaped aperture, the collimated parallel light always covers the light transmission aperture of the teardrop-shaped aperture. Finally, the six-dimensional pose adjustment of the converging lens (x, y, z and α, β, γ) is controlled by the beam-converging lens pose adjustment mechanism to achieve the alignment of the optical axis of the converging lens with the optical axis of the beam-expanding lens.

3. The method for subdividing star point energy in a faint starlight simulator according to claim 2, characterized in that, include: By adjusting the relative poses between the beam-expanding lens and the converging lens through the beam-expanding lens pose adjustment mechanism and the beam-converging lens pose adjustment mechanism, the optical axes of the parallel light before and after attenuation can be offset relative to the optical axis of the aperture of the teardrop-shaped aperture. When the teardrop-shaped aperture is in its initial position, the maximum luminous flux is a times M, where a < 1. During the rotation of the teardrop-shaped aperture, there are a total number of stops G. Thus, the luminous flux of the parallel light after attenuation is attenuated from aM to 0 after G adjustments, and the star point energy subdivision accuracy is aM / G.

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