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.