The solar simulator can accurately simulate the collimation, uniformity and spectral characteristics of solar radiation, and has high spatial heat flow simulation accuracy. It is mainly used for spacecraft thermal balance test, thermal coating property test and material aging test, which can effectively test the satellite's light irradiation and verify the thermal design of the spacecraft. The solar simulator's photoelectric conversion test using a solar simulator can improve the reliability of satellite operation. This paper introduces the successful solar simulator in recent years, expounds the main working principle of the solar simulator, and introduces the optical structure and basic working principle of the optical integrator of the key components in the solar simulator component. An optical integrator component of a solar simulator is designed, which is mainly applied to large and medium-sized solar simulators. By optimizing its design, the uniformity of illumination of the solar simulator can be effectively improved. The design is primarily analyzed in terms of optics, mechanics and cooling. First, the design and calculation of the structure and cooling are performed according to the optical design. Thermal analysis of the optical structure was performed by mechanical software, and simulation of a medium-sized solar simulator was performed using LIGHTTOOLS optical software. The results show that the integrator can make the radiation non-uniformity of the medium-sized solar simulator reach ±5%, which can effectively improve the performance of large and medium-sized solar simulators.
With the increasing of human space activities, space debris increases sharply, and this will seriously threaten the safety of spacecraft in orbit. In order to meet the requirements of spacecraft on-orbit service, space detectors can be used to identify and detect non-cooperative objects such as space debris around orbit, which will reduce the impact probability of spacecraft on-orbit and ensure the sustainable use of orbital resources. In order to improve the probability of on-orbit detection, it is necessary to conduct sufficient simulation and verification tests on the ground to ensure the effectiveness of on-orbit detection. On the basis of large cryogenic radiometric calibration optical system, a set of optical hardware-in-the-loop simulation and verification system is proposed in this paper, including large space environment simulator, large cryogenic projection system, optical target simulation system, target attitude simulator, central control system, etc. At present, the technology has been applied to the ground performance test of a space camera, which verifies the influence of target jitter on the image detection effect, and obtains a large number of experimental data, and achieves satisfactory results. In the future, this technology will be studied in depth, mainly to improve the accuracy of target simulation, expand the types of simulation targets and increase the joint validation function of the system. It will continue to be applied in the system-level performance verification of space detectors, and it will have broad application prospects and important practical significance in space on-orbit service tasks.
With the development of aerospace technology, the demand for solar simulation technology is getting higher and higher. The realization of solar simulation technology mainly has the following two ways: solar simulator and solar irradiation lamp array. The main applications of solar irradiation arrays are in the fields of aerospace, automobile and vehicle, material performance testing, agricultural breeding, etc. Compared with solar simulators, the structure is simple, economical and has a large irradiation area. The Beijing Institute of Satellite Environmental Engineering has successfully developed a single-sided wall vertical arrangement lamp array. The successful irradiation area of Xi'an JiaoTong University is 2.0m*1.5m, the irradiation is 1000w/m2, and the unevenness is better than ±5%. Lighting system. This design meets the requirements of thermal flow simulation of military aircraft cabins, improves the accuracy of heat flow simulation, and establishes a set of high-power radiation simulation devices. Through design simulation, it can be seen that the irradiation area of this heat flow simulation irradiation system can reach 1500mm*3500mm, at work. Within 1m, the irradiation energy is continuously adjustable from 0.8 to 1.5sc, the maximum radiant energy can reach 1.8sc (1sc=1353w/m2), and its uniformity can reach ±6.7%. The device can be used for aerospace components of the sun. Irradiation environment simulation test, etc.
The application of Computer- Generated Hologram (CGH) in spatial optical field modulation has greatly promoted the advancement of cutting-edge technologies such as ultra-precise measurement, optical tweezers, super resolution. However, the current processing of CGH is mainly based on microlithography technology. The minimum line width and processing accuracy of CGH have become a crux that limits its further application. In response to the crux, this paper proposes a liquid crystal CGH based on spatial light modulator (SLM) interference exposure method and photoalignment technology, combining the advantages of optical holography and computer-generated holography, aiming at achieving design and fabrication of high precision, maskless, rewritable, sub-micron linewidth liquid crystal CGH. This paper mainly elaborates the principle and design method of the liquid crystal CGH, laying a theoretical foundation for its subsequent widespread application.
In order to meet the experimental requirement of in-situ measurement for spectral reflectance of advanced thermal control coatings, a high accuracy in-situ measurement system for spectral reflectance of thermal control coatings of spacecraft is developed based on dual-beam spectrophotometry. The measurement wavelength range is 200 to 2500 nm, and the measurement accuracy is better than 0.5%. In the space ultraviolet radiation environmental effect test, it can realize the integrated test process of sample delivery, sampling, separation, in-situ measurement of spectral reflectance in vacuum.