Abstract
This paper presents a design of a dual-band integrated space telescope system for visible light and long-wave infrared. The system can simultaneously image the visible light band of 450–900 nm and the long-wave infrared band of 7700–10,500 nm. The dual-band integrated imaging system can freely switch the observation band to adapt to different scenes and environmental changes. The camera can also further expand its capabilities in the fields of multi-spectral observation and low-light observation by collocation with different detectors. This design is based on a coaxial reflection system, the two bands share the camera’s primary and secondary mirrors, and the separation of the two bands is achieved through a separate field of view design. After simulation, the average Modulation Transfer Function (MTF) value of the visible light band of the system at 50 lp/mm (line pairs per millimeter) reaches 0.45, and the average MTF value of the long-wave infrared band at 50 lp/mm reaches 0.36. In addition, tolerance analysis, ambient temperature analysis and transmittance analysis of the integrated system are carried out in this paper to further improve the integrated system scheme, and the feasibility of the system is further verified.
Highlights
With the rapid development of space optical payload technology, the design of optical payload has shifted from focusing solely on basic indicators such as resolution and field of view (FOV) to a systematic indicator of multi-purpose and high-efficiency applications
The Goodrich SYERS-2 detector used by the ORS-1 satellite, launched by the United States in 2011, has seven imaging spectrum bands, including panchromatic band, near-infrared band, two short-wave infrared bands, one mid-wave infrared band and red band and green band [5]
The second section of this paper introduces the integrated design scheme and the calculation method of the initial structure in detail; the third section uses the Code V software to design the two subsystems separately and combines the two systems; Section 4 carries out the system Tolerance analysis; Section 5 analyzes the ambient temperature of the system; Section 6 analyzes the optical transmittance of the system; and summarizes the main conclusions
Summary
With the rapid development of space optical payload technology, the design of optical payload has shifted from focusing solely on basic indicators such as resolution and field of view (FOV) to a systematic indicator of multi-purpose and high-efficiency applications. The single-spectrum detector imaging system can acquire very limited spectral information in the target area, while the use of multi-detector integrated cameras working in different spectral bands can make use of the data complementarity and redundancy of different detectors. This results in a single payload owning the ability to simultaneously acquire high-resolution images of multiple spectral bands in the target area, which greatly enhances the camera’s ability to adapt to the environment and the ability to acquire information about the target. The second section of this paper introduces the integrated design scheme and the calculation method of the initial structure in detail; the third section uses the Code V software to design the two subsystems separately and combines the two systems; Section 4 carries out the system Tolerance analysis; Section 5 analyzes the ambient temperature of the system; Section 6 analyzes the optical transmittance of the system; and summarizes the main conclusions
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