Optical axis calibration system for solar simulator

Abstract

The invention relates to a solar simulator optical axis consistency technology, in particular to a solar simulator-oriented optical axis calibration system, which comprises a CCD (Charge Coupled Device) camera, a camera bracket, a computer, a pentaprism, a beam splitter prism, a laser light source, an R-axis rotating platform a, an R-axis rotating platform b, a fixed-axis reflecting mirror A, a fixed-axis reflecting mirror B and a lifting platform. The laser light source emits a light beam, the rotation directions of the pentaprism and the beam splitter prism are controlled through the R-axis rotating platform a and the R-axis rotating platform b, so that the pentaprism and the beam splitter prism complete the steering of the laser beam, and the laser beam passes through the solar simulator system and is reflected by the fixed-axis reflector A and the fixed-axis reflector B; the laser beam passes through the solar simulator system again and returns to the CCD camera, the CCD camera is controlled by a computer and is provided with a positioning center, a light spot formed by the returned laser beam on the CCD camera coincides with the positioning center of the CCD camera, and high-precision calibration of the optical axis of the solar simulator system is completed.

Description

Technical Field

[0001] The invention relates to a solar simulator optical axis consistency technology, and in particular to an optical axis calibration system for a solar simulator. Background Art

[0002] A solar simulator is a test or calibration device that uses artificial light sources, focusing systems, homogenization systems, and collimation optical systems to simulate uniform and stable light irradiation that matches the solar spectrum distribution indoors. It can achieve true simulation of solar irradiance, solar collimation angle, irradiation stability, and uniformity. It can be used in solar cell testing, spacecraft thermal balance and thermal control coating characteristic experiments, remote sensing technology indoor simulation of solar spectrum irradiation, and is also a ground simulation test and calibration device in the development of solar sensors, a key component of attitude measurement in satellite control systems. Irradiation non-uniformity is one of the important indicators of solar simulator design, which directly determines the accuracy of the solar simulator. The conditions that determine irradiation non-uniformity are not only the design of the solar simulator system, but also the consistency of the optical axis of the solar simulator optical system. The solar simulator optical axis calibration system is used for high-precision calibration of the optical axis of the solar simulator system, which is a necessary step to improve the technical indicators of the solar simulator.

[0003] Judging from the current research results, the improvement of internal systems such as wide-range solar irradiance regulation, solar spectrum simulation, and solar simulator concentrating system has been relatively complete. However, the high-precision calibration of the optical axis of the solar simulator system is still in urgent need of being solved. Although traditional solar simulator optical axis calibration methods, such as the self-collimation method, the node-based optical axis calibration auxiliary method, and the spatial layout method, can achieve the basic calibration of the optical axis of the solar simulator system, they cannot achieve the requirement of 1% irradiation non-uniformity, which is one of the technical indicators of the solar simulator, and cannot meet the current irradiation demand for high uniformity of solar simulator irradiation, which restricts the development of industries such as aerospace.

[0004] In order to improve the uniformity of the solar simulator light spot and achieve the requirement of 1% irradiation unevenness of the solar simulator output light spot, a high-precision system optical axis calibration method for the solar simulator is needed to achieve the improvement of the optical axis consistency and irradiation unevenness of the solar simulator system without affecting the solar collimation angle, irradiation stability, and solar radiation spectrum distribution. Summary of the invention

[0005] The present invention provides an optical axis calibration system for a solar simulator, which aims to solve the problem that the light spot irradiation unevenness cannot meet the required requirements due to the low precision of the existing optical axis calibration method of the solar simulator system.

[0006] To achieve this purpose, the technical solution adopted by the present invention is as follows:

[0007] Design an optical axis calibration system for a solar simulator, including: a CCD camera, a camera bracket, a computer, a laser light source, a pentaprism, a beam splitter, an R-axis rotating platform a, an R-axis rotating platform b, a fixed-axis transmitting mirror A, a fixed-axis reflecting mirror B, and a lifting platform;

[0008] In order to realize the high-precision calibration of the optical axis of the solar simulator, the CCD camera is used to receive the light beam emitted by the laser light source; the computer is used to control the CCD camera and set the positioning center in the CCD camera; the camera bracket is used to support the camera and the dichroic prism to be coplanar; the laser light source is used to provide the CCD camera with a receiving light beam to visualize the optical axis of the solar simulator; the pentaprism is used to complete the steering of the laser so that the fixed-axis reflector A and the fixed-axis reflector B receive the light beam emitted by the laser light source; the dichroic prism is used to complete the transmission and steering of the laser so that the CCD camera receives the light beam emitted by the laser light source; the R-axis rotating platform a is used to control the rotation direction of the pentaprism, and the R-axis rotating platform b is used to control the rotation direction of the dichroic prism so that the fixed-axis reflector A and the fixed-axis reflector B both receive the laser beam; the fixed-axis reflector A and the fixed-axis reflector B are used to reflect the received laser beam so that the laser beam returns to the original path; the lifting platform is used to place and adjust the height position of the dichroic prism and the laser light source so that the dichroic prism and the laser light source are in the same plane with the pentaprism;

[0009] The solar simulator is composed of a xenon lamp light source, a focusing system, a steering reflector, a uniform light system, and a collimating optical system. The xenon lamp light source is placed at the lower end of the focusing system, the focusing system is placed at the lower end of the steering reflector, the steering reflector is placed at the rear end of the uniform light system, and the uniform light system is placed at the rear end of the collimating optical system.

[0010] The pentaprism is placed and fixed on the R-axis rotating platform a; the R-axis rotating platform a and the pentaprism are placed at the front end of the light homogenizing system and the rear end of the collimating optical system; the lifting platform is placed beside the R-axis rotating platform a, on the right side of the solar simulator system, and has no mechanical contact with the solar simulator; the beam splitter prism is placed on the R-axis rotating platform b, facing the pentaprism, and at the focal plane position of the CCD camera; the R-axis rotating platform b is placed on the lifting platform; the laser light source is placed on the lifting platform, and in front of the beam splitter prism; the CCD camera is placed on the camera bracket, facing the beam splitter prism; the fixed-axis reflector A is placed at the front end of the collimating optical system; the fixed-axis reflector B is placed above the focusing system;

[0011] Furthermore, the xenon lamp light source, focusing system, steering reflector, uniform light system, and collimating optical system of the solar simulator system have the same optical axis; the xenon lamp light source, focusing system, and steering reflector of the solar simulator system have the same optical axis and are in the same plane x; the steering reflector, uniform light system, and collimating optical system of the solar simulator system have the same optical axis and are in the same plane y; plane x and plane y are in mutually perpendicular directions; the pentaprism, dichroic prism, laser light source, and CCD camera are on plane y; the R-axis rotating platform a is placed below the pentaprism, and the R-axis rotating platform b is placed above the dichroic prism. Below, the camera bracket is placed below the CCD camera, and the lifting platform is placed below the R-axis rotating platform b and the laser light source; the pentaprism, the dichroic prism, and the laser light source have the same optical axis; the CCD camera has the same optical axis as the dichroic prism, and is perpendicular to the direction of the laser light source light beam emission; the inner bevel of the dichroic prism is 45° to the optical axis of the pentaprism, the dichroic prism, and the laser light source, and the CCD camera can receive the laser light beam reflected from the pentaprism to the dichroic prism; the optical axis of the fixed-axis reflector A is the same as the optical axis of the collimating optical system; the fixed-axis reflector B is the same as the optical axis of the focusing system;

[0012] Further, according to the maximum illumination value E of the spot within the irradiation surface at a specified distance after the light beam passes through the collimating optical system, max The minimum illumination value E of the spot within the irradiation surface at a specified distance after the beam passes through the collimator min The formula for calculating the irradiance unevenness of the solar simulation spot is ε,

[0013]

[0014] when , that is, to achieve high-precision calibration of the optical axis of the solar simulator system. The specific method for calibrating the optical axis of the solar simulator system is: In the collimating optical system, according to the object focal length of the collimating optical system f c , thickness of collimating lens t 1. t 2. Spacing of collimating lenses d c , the height of the light at the front focal plane of the collimating optical system x 3. Deflection angle of light on the front focal plane of the collimating optical system α 3. The height of the light beam reaching the specified distance from the irradiation surface after passing through the collimating optical system x 4. The deflection angle of the light beam after it passes through the collimating optical system and reaches the irradiation surface at a specified distance α 4. Calculate the size of the light spot formed at the specified working distance after the light beam passes through the collimating optical system.

[0015]

[0016] Then, the laser light source is turned on, and the light beam emitted by the laser light source passes through the beam splitter prism and the pentaprism. After the laser light beam passes through the beam splitter prism, the pentaprism makes the laser light path realize a right-angle turn, and then passes through the collimating optical system and hits the fixed-axis reflector A. The fixed-axis reflector A makes the laser return along the original path, and realizes two deflections of the light path through the pentaprism and the beam splitter prism, so that the laser light beam is received by the CCD camera. The computer-controlled CCD camera is provided with a positioning center. When the returned light beam converges on the CCD camera, the offset angle θ1 of the optical axis of the collimating system and the distance between the center of the laser spot formed by the laser light beam on the CCD camera and the positioning center of the CCD camera are used. d 1. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis of the collimating optical system.

[0017]

[0018] The position of the collimating optical system is adjusted by the collimating optical system adjustment mechanism so that the light spot formed by the laser beam on the CCD camera coincides with the positioning center of the CCD camera, and the optical axis of the collimating optical system is calibrated as the reference optical axis of the solar simulator system.

[0019] In the focusing system, according to the axial position of the inner wall of the focusing system irradiated by the xenon lamp light source x 1. The xenon lamp light source irradiates the radial position of the inner wall of the focusing system y 1. The slope k of the light reflected by the inner wall of the focusing system is used to calculate the size of the light spot formed at the second focal plane of the focusing system after the light beam emitted by the xenon lamp light source is reflected by the focusing system.

[0020]

[0021] Then, the laser light source is turned on. At this time, the homogenizing system is not placed in the solar simulator. The light beam emitted by the laser light source passes through the beam splitter and the pentaprism. After the laser light beam passes through the beam splitter, the pentaprism makes the laser light beam realize right-angle bending. The laser light beam hits the steering reflector. The steering reflector makes the laser light path realize a second right-angle bending. The edge of the focusing system is fixed on the mechanical support structure. The fixed axis reflector B is placed above the edge of the focusing system. The light beam emitted by the laser light source is bent by the pentaprism and the steering reflector and hits the fixed axis reflector B at the upper end of the focusing system. The fixed axis reflector B makes the laser light beam return to the original path, passes through the steering reflector, the pentaprism and the beam splitter to realize the light path bending, so that the laser light beam is received by the CCD camera. The computer-controlled CCD camera is provided with a positioning center. When the returned light beam converges on the CCD camera, the offset angle θ2 of the optical axis of the focusing system and the distance between the center of the laser spot formed by the laser light beam on the CCD camera and the positioning center of the CCD camera are used. d 2. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis of the focusing system.

[0022]

[0023] The position of the focusing system is adjusted by the focusing system adjustment mechanism so that the light spot formed by the laser beam on the CCD camera coincides with the positioning center of the CCD camera, and the optical axis of the focusing system is calibrated to be on the reference optical axis of the solar simulator system.

[0024] In the light homogenization system, the size D of the light spot formed on the front focal plane of the collimating optical system by the light beam passing through the light homogenization system and the focal length of the light homogenization system are determined. F O , the aperture of the element lens in the light homogenization system p , the focal length of the element lens in the homogenization system f L , calculate the size of the light spot formed at the front focal plane of the collimating optical system after the light beam passes through the homogenizing system.

[0025]

[0026] Then, the laser light source is turned on, and the light homogenizing system is placed in the mechanical structure of the solar simulator. The light homogenizing system has two sets of three-tightening and three-pulling mechanisms: one is to adjust the consistency of the overall optical axis of the optical integrator and the overall optical axis of the solar simulator; the other is to adjust the consistency of the optical axis between the field lens group and the projection lens group inside the optical integrator. The light beam emitted by the laser light source passes through the beam splitter prism and the pentaprism. After the laser light beam passes through the beam splitter prism, the pentaprism makes the laser light path realize right-angle folding, and the laser light beam hits the steering reflector. The steering reflector makes the laser light beam realize secondary right-angle folding. The edge of the focusing system is fixed on the mechanical support structure, and the fixed axis reflector B is placed above the edge of the focusing system. The light beam emitted by the laser light source is folded by the pentaprism and the steering reflector, and hits the fixed axis reflector B at the upper end of the focusing system. The fixed axis reflector B makes the laser light beam return to the original path, and the light path is folded through the steering reflector, the pentaprism and the beam splitter prism, so that the laser light beam is received by the CCD camera. The computer-controlled CCD camera is provided with a positioning center. When the returning light beam converges on the CCD camera, the offset angle θ3 of the optical axis of the uniform light system, the distance between the center of the laser spot formed by the laser beam on the CCD camera and the positioning center of the CCD camera are used. d 3. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis of the homogenization system.

[0027]

[0028] The position of the light homogenizing system is adjusted by the three-tightening and three-pulling mechanism of the light homogenizing system adjustment mechanism, so that the light spot formed by the laser beam on the CCD camera coincides with the positioning center of the CCD camera, and the optical axis of the light homogenizing system is calibrated on the reference optical axis of the solar simulator system.

[0029] Compared with the prior art, the advantages of the present invention are: The present invention only observes whether the laser spot received by the computer-controlled CCD camera coincides with the positioning center of the CCD camera, determines whether the system optical axis is consistent, and performs position fine-tuning through the adjustment mechanism of each system to complete the calibration of the optical axis of the solar simulator system, effectively improving the irradiation uniformity of the final irradiation surface spot. In addition, the designed solar simulator optical axis calibration system only uses a beam splitter prism, a pentaprism, an external fixed axis reflector A and a fixed axis reflector B to allow the laser beam to be received by the CCD camera, so it is not limited by the mechanical structure outside the solar simulator. In the specific implementation, only the focusing system, the uniform light system, and the collimating optical system are fine-tuned, and there is no need to move the device significantly, thereby affecting the performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1Schematic diagram of the layout of an optical axis calibration system for a solar simulator Figure 2 Schematic diagram of a method for calibrating the optical axis of a collimating optical system and calibrating the optical axis of the collimating optical system as a reference axis. Figure 3 Schematic diagram of a method for calibrating the optical axis of a focusing system and calibrating the optical axis of the focusing system on a reference axis. Figure 4 Schematic diagram of a method for calibrating the optical axis of a light-homogenizing system and calibrating the optical axis of the light-homogenizing system on a reference axis. Explanation of reference numerals: 10, xenon lamp light source; 20, focusing system; 30, steering reflector; 40, light homogenizing system; 50, collimating optical system; 60, pentaprism; 70, R-axis rotating platform a; 80, dichroic prism; 90, R-axis rotating platform b; 100, laser light source; 110, lifting platform; 120, CCD camera; 130, camera bracket; 140, computer; 150, fixed-axis reflector A; 160, fixed-axis reflector B; 170, focusing system optical axis; 180, light homogenizing system optical axis; 190, collimating optical system optical axis; 200, dichroic prism optical axis; 210, CCD camera optical axis DETAILED DESCRIPTION The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that in the drawings or specifications, similar or identical elements are marked with the same reference numerals.

[0031] Figure 1 The schematic diagram of the layout of an optical axis calibration system for a solar simulator. The solar simulator is composed of a xenon lamp light source 10, a focusing system 20, a steering reflector 30, a uniform light system 40, and a collimating optical system 50. An optical axis calibration system for a solar simulator includes: a pentaprism 60, an R-axis rotating platform a70, a beam splitter prism 80, an R-axis rotating platform b90, a laser light source 100, a lifting platform 110, a CCD camera 120, a camera bracket 130, a computer 140, a fixed-axis transmitting mirror A150, and a fixed-axis reflector B160; an optical axis of the focusing system 170; an optical axis of the uniform light system 180; an optical axis of the collimating optical system 190; an optical axis of the beam splitter prism 200; and an optical axis of the CCD camera 210.

[0032] The xenon lamp light source 10 is placed at the lower end of the focusing system 20, the focusing system 20 is placed at the lower end of the steering reflector 30, the steering reflector 30 is placed at the rear end of the uniform light system 40, and the uniform light system 40 is placed at the rear end of the collimating optical system 50; the pentaprism 60 is placed and fixed on the R-axis rotating platform a70; the R-axis rotating platform a70 and the pentaprism 60 are placed at the front end of the uniform light system 40 and the rear end of the collimating optical system 50; the lifting platform 110 is placed beside the R-axis rotating platform a70, on the right side of the solar simulator system, and at the position where the solar simulator is not Mechanical contact; the dichroic prism 80 is placed on the R-axis rotating platform b90, facing the pentaprism 60, and at the focal plane position of the CCD camera 120; the R-axis rotating platform b90 is placed on the lifting platform 110; the laser light source 100 is placed on the lifting platform 110, and in front of the dichroic prism 80; the CCD camera 120 is placed on the camera bracket 130, facing the dichroic prism 80; the fixed-axis reflector A150 is placed at the front end of the collimating optical system 50; the fixed-axis reflector B160 is placed above the focusing system 20.

[0033] The xenon lamp light source 10, the focusing system 20, the steering reflector 30, the uniform light system 40, and the collimating optical system 50 of the solar simulator system are on the same optical axis; the xenon lamp light source 10, the focusing system 20, and the steering reflector 30 of the solar simulator system are on the same optical axis and are in the same plane x; the steering reflector 30, the uniform light system 40, and the collimating optical system 50 of the solar simulator system are on the same optical axis and are in the same plane y; plane x and plane y are in mutually perpendicular directions; the pentaprism 60, the beam splitter prism 80, the laser light source 100, and the CCD camera 120 are on plane y; the R-axis rotating platform a70 is placed below the pentaprism 60, the R-axis rotating platform b90 is placed below the beam splitter prism 80, the camera bracket 130 is placed below the CCD camera 120, and the lifting platform 110 is placed below the R-axis rotating platform b90 and the laser light source 100; the inner inclined surface of the beam splitter prism 80 is 45° with the optical axis where the pentaprism 60, the beam splitter prism 80, and the laser light source 100 are located, and The CCD camera 120 can receive the light beam reflected from the pentaprism 60 to the dichroic prism 80; the pentaprism 60, the dichroic prism 80 and the laser light source 100 are on the same optical axis; the CCD camera 120 is on the same optical axis as the dichroic prism 80 and is perpendicular to the direction of the light beam emitted by the laser light source 100; the computer 140 is placed beside the CCD camera 120 and is connected to the CCD camera 120; the optical axis of the fixed-axis reflector A150 is on the same optical axis as the collimating optical system 50; the fixed-axis reflector A150 is on the same optical axis as the collimating optical system 50; The projection mirror B160 has the same optical axis as the focusing system 20; the focusing system optical axis 170, the light homogenizing system optical axis 180, and the collimating optical system optical axis 190 are on the same optical axis; the plane where the focusing system optical axis 170 is located is perpendicular to the plane where the light homogenizing system optical axis 180 is located; the plane where the light homogenizing system optical axis 180 is located coincides with the plane where the collimating optical system 190 is located; the plane where the beam splitter prism optical axis 200 and the CCD camera optical axis 210 are located coincides with the plane where the light homogenizing system optical axis 180 is located.

[0034] Figure 2 The present invention is a schematic diagram of a method for calibrating the collimating optical system optical axis 190 and calibrating the collimating optical system optical axis 190 as a reference axis in an optical axis calibration system for a solar simulator system. f c , thickness of collimating lens t 1. t 2. Spacing of collimating lenses d c , the height of the light from the front focal plane of the collimating optical system 50 x 3. Deflection angle of the light at the front focal plane of the collimating optical system 50 α 3. After the light beam passes through the collimating optical system 50, it reaches the height of the light beam at the specified distance from the irradiation surface x 4. The deflection angle of the light beam after it passes through the collimating optical system 50 and reaches the irradiation surface at a specified distance α4. Calculate the size of the light spot formed at the specified working distance after the light beam passes through the collimating optical system for 50 seconds.

[0035]

[0036] Then, the laser light source 100 is turned on. The light beam emitted by the laser light source 100 passes through the beam splitter prism 80 and the pentaprism 60. After the laser light beam passes through the beam splitter prism 80, the pentaprism 60 makes the laser light path realize a right-angle turn and then passes through the collimating optical system 50 to hit the fixed-axis reflector A150. The fixed-axis reflector A150 makes the laser return along the original path and realizes two deflections of the light path through the pentaprism 60 and the beam splitter prism 80, so that the laser is received by the CCD 120 camera. The CCD camera 120 controlled by the computer 140 is provided with a positioning center. When the returning light beam converges on the CCD camera 120, the offset angle θ1 of the optical axis 190 of the collimating system and the distance between the center of the laser spot formed by the laser light beam on the CCD camera 120 and the positioning center of the CCD camera are used. d 1. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis 190 of the collimating optical system.

[0037]

[0038] The position of the collimating optical system 50 is adjusted by the collimating optical system adjustment mechanism so that the light spot formed by the laser beam on the CCD camera 120 coincides with the positioning center of the CCD camera, and the collimating optical system optical axis 190 is calibrated as the reference optical axis of the solar simulator system.

[0039] Figure 3 The schematic diagram of the method for calibrating the optical axis 170 of the focusing system and calibrating the optical axis 170 of the focusing system on the reference axis in the optical axis calibration system for the solar simulator system. x 1. The light from the xenon lamp light source 10 is irradiated to the radial position of the inner wall of the focusing system 20 y 1. The slope k of the light reflected by the inner wall of the focusing system 20 is used to calculate the size of the light spot formed at the second focal plane of the focusing system 20 after the light beam emitted by the xenon lamp light source 10 is reflected by the focusing system 20.

[0040]

[0041] Then, the laser light source 100 is turned on. At this time, the light homogenization system 40 is not placed in the solar simulator structure. The light beam emitted by the laser light source 100 passes through the beam splitter prism 80 and the pentaprism 60. After the laser light beam passes through the beam splitter prism 80, the pentaprism 60 makes the laser light path realize right-angle folding, and the light beam hits the steering reflector 30. The steering reflector 30 makes the laser light path realize secondary right-angle folding. The edge of the focusing system 20 is fixed on the mechanical support structure, and the fixed axis reflector B160 is placed above the edge of the focusing system 20. The light beam emitted by the laser light source 100 is folded by the pentaprism 60 and the steering reflector, and hits the fixed axis reflector B160 at the upper end of the focusing system 20. The fixed axis reflector B160 makes the laser light return to the original path, and the light path is folded through the steering reflector 30, the pentaprism 60 and the beam splitter prism 80, so that the laser light beam is received by the CCD camera 120. The CCD camera 120 controlled by the computer 140 is provided with a positioning center. When the returning light beam converges on the CCD camera 120, the offset angle θ2 of the optical axis 170 of the focusing system and the distance between the center of the laser spot formed by the laser beam on the CCD camera 120 and the positioning center of the CCD camera are used. d 2. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis 170 of the focusing system.

[0042]

[0043] The position of the focusing system 20 is adjusted by the focusing system adjustment mechanism so that the light spot formed by the laser beam on the CCD camera 120 coincides with the positioning center of the CCD camera, and the focusing system optical axis 170 is calibrated on the reference optical axis of the solar simulator system.

[0044] Figure 4 The schematic diagram is a method for calibrating the light axis 180 of the homogenizing system and calibrating the light axis 180 of the homogenizing system on the reference axis in the optical axis calibration system for the solar simulator system. F O , the aperture of the element lens in the light homogenization system 40 p , the focal length of the element lens in the homogenization system 40 f L , calculate the size of the light spot formed at the front focal plane of the collimating optical system 50 after the light beam passes through the light homogenizing system 40.

[0045]

[0046] Then, the laser light source 100 is turned on, and the light homogenizing system 40 is placed in the mechanical structure of the solar simulator. The light homogenizing system 40 has two sets of three-tightening and three-pulling mechanisms: one is to adjust the consistency of the overall optical axis of the light homogenizing system 40 and the overall optical axis of the solar simulator; the other is to adjust the consistency of the optical axis between the field lens group and the projection lens group in the light homogenizing system 40. The light beam emitted by the laser light source 100 passes through the beam splitter prism 80 and the pentaprism 60. After the laser light beam passes through the beam splitter prism 80, the pentaprism 60 makes the laser light path realize a right-angle turn, and the light beam hits the steering reflector 30, and the steering reflector 30 makes the laser light path realize a second right-angle turn. The edge of the focusing system 20 is fixed on the mechanical support structure, and the fixed-axis reflector B160 is placed above the edge of the focusing system 20. The light beam emitted by the laser light source 100 is deflected by the pentaprism 60 and the steering reflector 30, and hits the fixed-axis reflector B160 at the upper end of the focusing system 20, i.e., the ellipsoidal focusing mirror. The fixed-axis reflector B160 returns the laser beam to its original path, and the light path is deflected by the steering reflector 30, the pentaprism 60 and the beam splitter prism 80, so that the laser is received by the CCD camera 120. The CCD camera 120 controlled by the computer 140 is provided with a positioning center. When the returned light beam converges on the CCD camera 120, the offset angle θ3 of the optical axis 180 of the homogenizing system and the distance between the center of the laser spot formed by the laser beam on the CCD camera 120 and the positioning center of the CCD camera are used. d 3. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis 180 of the homogenization system.

[0047]

[0048] The position of the homogenizing system 40 is adjusted by the three-tightening and three-pulling mechanism of the homogenizing system adjustment mechanism, so that the light spot formed by the laser beam on the CCD camera 120 coincides with the positioning center of the CCD camera, and the optical axis 180 of the homogenizing system is calibrated on the reference optical axis of the solar simulator system.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical axis calibration system for a solar simulator, characterized in that: include: CCD camera, camera bracket, computer, pentaprism, dichroic prism, laser light source, R-axis rotating platform a, R-axis rotating platform b, fixed-axis transmitting mirror A, fixed-axis reflecting mirror B, lifting platform. The calibrated solar simulator system consists of a xenon lamp light source, a focusing system, a steering reflector, a uniform light system, and a collimating optical system. The xenon lamp light source is placed at the lower end of the focusing system, the focusing system is placed at the lower end of the steering reflector, the steering reflector is placed at the rear end of the uniform light system, and the uniform light system is placed at the rear end of the collimating optical system; the pentaprism is placed and fixed on the R-axis rotating platform a; the R-axis rotating platform a and the pentaprism are placed at the front end of the uniform light system and the rear end of the collimating optical system; the lifting platform is placed beside the R-axis rotating platform a, on the right side of the solar simulator system, and has no mechanical contact with the solar simulator; the dichroic prism is placed on the R-axis rotating platform b, facing the pentaprism, and at the focal plane of the CCD camera; the R-axis rotating platform b is placed on the lifting platform; The laser light source is placed on the lifting platform and in front of the beam splitter prism; the CCD camera is placed on the camera bracket and faces the beam splitter prism; The fixed-axis reflector A is placed at the front end of the collimating optical system; The fixed-axis reflector B is placed above the focusing system.

2. The optical axis calibration system for a solar simulator according to claim 1, characterized in that: The xenon lamp light source, focusing system, steering reflector, light homogenizing system and collimating optical system of the solar simulator system have the same optical axis; the xenon lamp light source, focusing system and steering reflector of the solar simulator system have the same optical axis and are in the same plane x; the steering reflector, light homogenizing system and collimating optical system of the solar simulator system have the same optical axis and are in the same plane y; plane x and plane y are perpendicular to each other; the pentaprism, dichroic prism, laser light source and CCD camera are on plane y; the R-axis rotating platform a is placed below the pentaprism, and the R-axis rotating platform b is placed below the dichroic prism. The camera bracket is placed below the CCD camera, and the lifting platform is placed below the R-axis rotating platform b and the laser light source; the pentaprism, the dichroic prism, and the laser light source have the same optical axis; the CCD camera and the dichroic prism have the same optical axis, and are perpendicular to the emission direction of the laser light source light beam; the inner inclined surface of the dichroic prism is 45° to the optical axis of the pentaprism, the dichroic prism, and the laser light source, and the CCD camera can receive the laser light beam reflected from the pentaprism to the dichroic prism; the optical axis of the fixed-axis reflector A is the same as the optical axis of the collimating optical system; the fixed-axis reflector B is the same as the optical axis of the focusing system.

3. The optical axis calibration system for a solar simulator according to claim 1, characterized in that: The CCD camera is used to receive the light beam emitted by the laser light source; the computer is used to control the CCD camera and set the positioning center in the CCD camera; the camera bracket is used to support the camera and the dichroic prism to be coplanar; the laser light source is used to provide the CCD camera with a receiving light beam to visualize the optical axis of the solar simulator; the pentaprism is used to complete the steering of the laser so that the fixed-axis reflector A and the fixed-axis reflector B receive the light beam emitted by the laser light source; the dichroic prism is used to complete the transmission and steering of the laser so that the CCD camera receives the light beam emitted by the laser light source; the R-axis rotating platform a is used to control the rotation direction of the pentaprism, and the R-axis rotating platform b is used to control the rotation direction of the dichroic prism so that the fixed-axis reflector A and the fixed-axis reflector B can both receive the laser beam; the fixed-axis reflector A and the fixed-axis reflector B are used to reflect the received laser beam so that the laser beam returns to the original path; the lifting platform is used to place and adjust the height position of the dichroic prism and the laser light source so that the dichroic prism and the laser light source are in the same plane with the pentaprism.

4. The optical axis calibration system for a solar simulator according to claim 1, characterized in that: According to the maximum irradiance E of the spot within the irradiation surface at a specified distance after the light beam passes through the collimating optical system max The minimum irradiance E of the spot within the irradiation surface at a specified distance after the beam passes through the collimating optical system min Calculate the irradiance unevenness formula ε of the solar simulation spot; ； Determining the calibration conditions of the optical axes of the focusing system, the homogenizing system and the collimating optical system in the solar simulator system; According to the object focal length of the collimating optical system f c , thickness of collimating lens t 1. t 2. Spacing of collimating lenses d c , the height of the light at the front focal plane of the collimating optical system x 3. Deflection angle of light on the front focal plane of the collimating optical system α 3. The height of the light beam reaching the specified distance from the irradiation surface after passing through the collimating optical system x 4. The deflection angle of the light beam after it passes through the collimating optical system and reaches the irradiation surface at a specified distance α 4. Calculate the size of the light spot formed at a specified working distance after the light beam passes through the collimating optical system; ； Then, the offset angle θ1 of the optical axis of the collimation system, the distance between the center of the laser spot formed by the laser beam on the CCD camera and the positioning center of the CCD camera are used to calculate the distance between the laser spot formed by the laser beam on the CCD camera and the positioning center of the CCD camera. d 1. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis of the collimating optical system; ； The position of the collimating optical system is adjusted by a collimating optical system adjustment mechanism so that the light spot formed by the laser beam on the CCD camera coincides with the positioning center of the CCD camera, thereby completing the calibration of the optical axis of the collimating optical system; According to the axial position of the inner wall of the focusing system irradiated by the xenon lamp light source x 1. The xenon lamp light source irradiates the radial position of the inner wall of the focusing system y 1. The slope of the light reflected by the inner wall of the focusing system k , calculate the size of the light spot formed at the front focal plane of the uniform light system after the light beam emitted by the xenon lamp light source is reflected by the focusing system; ； Then, the offset angle θ2 of the optical axis of the focusing system, the distance between the center of the laser spot formed by the laser beam on the CCD camera and the positioning center of the CCD camera are used. d 2. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis of the focusing system; ； The position of the focusing system is adjusted by a focusing system adjustment mechanism so that the light spot formed by the laser beam on the CCD camera coincides with the positioning center of the CCD camera, thereby completing the calibration of the optical axis of the focusing system; According to the size D of the light spot formed by the light beam passing through the homogenizing system on the front focal plane of the collimating optical system, the focal length of the homogenizing system F O , the aperture of the element lens in the light homogenization system p , the focal length of the element lens in the homogenization system f L , calculating the size of the light spot formed at the front focal plane of the collimating optical system after the light beam passes through the light homogenizing system; ； Then, the offset angle θ3 of the optical axis of the light homogenization system and the distance between the center of the laser spot formed by the laser beam on the CCD camera and the positioning center of the CCD camera are used. d 3. Equivalent optical path of laser beam in optical axis calibration system L The geometric relationship between the three determines the degree of deviation of the optical axis of the light homogenization system; ； The position of the light homogenizing system is adjusted by the three-tightening and three-pulling mechanism of the light homogenizing system adjustment mechanism, so that the light spot formed by the laser beam on the CCD camera coincides with the positioning center of the CCD camera, thereby completing the calibration of the optical axis of the light homogenizing system.

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