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多光束傅里叶望远镜(MFT)对运动的深空暗目标快速成像有着独特的优势,但光学、电学、机械、软件等未突破的关键技术制约着其发展。根据傅里叶望远镜的成像原理和戈洛姆法则(Golomb ruler),分析选取了多光束成像下每束光的移频量,并设计了符合系统要求的声光移频器。结果表明,采用Golomb ruler时,31束光系统下的最大相对移频量为7.47MHz,设计的声光移频器通光孔径为8mm,全频带下最低衍射效率为0.9021,各指标都能满足系统需求。因此,多光束傅里叶望远镜的移频技术可行。
The Multi-Beam Fourier Telescope (MFT) has unique advantages for the rapid imaging of deep dark targets in motion, but the key technologies of optics, electricity, machinery, software and other non-breakthrough have restricted its development. According to the imaging principle and Golomb ruler of Fourier Telescope, the frequency shift of each beam under multi-beam imaging was selected and the acousto-optic frequency shifter was designed to meet the system requirements. The results show that with Golomb ruler, the maximum relative frequency shift of the 31-beam system is 7.47MHz, the designed aperture of the acousto-optic frequency shifter is 8mm and the minimum diffraction efficiency is 0.9021 in the whole frequency band, system requirement. Therefore, multi-beam Fourier telescope frequency shift technique is feasible.