With the development of infrared technology, large-array infrared focal plane detector is getting more and more popular. In order to solve the problem of reduced reliability when the cooling head is packaged with large-array infrared detector, a new design with reinforcement structures on cold platform and cold shield is introduced in this paper. The finite element simulation is used to analyze the optimized structure, and the results show that this design can fully meet the mechanical requirements of the project. By using the reinforcement structures, a Dewar was designed and processed to package a 2.7K×2.7K-15μm large-array infrared detector. After all the packaging process, the total mass of the Dewar is only 800g, and the cooling head is more than 90g. Under the circumstances of a heavy cooling head, the Dewar successfully passed the environmental adaptability assessment, and there is no problem with all the indexes of the infrared focal plane detector, which verified the reliability of the reinforcement structure.
Innovations in optics, focal plane arrays (FPA), microelectronics and image processing have revolutionized infrared camera design. Infrared detectors coupled with nanostructures are expected to subvert the traditional intensity detectors and advance to the multi-dimensional and data cube detectors. Photon trapping technology is expected to decrease the intrinsic dark current, broaden the response band, increase the QE and increase the working temperature. High density FPAs result to novel wide field-of-view small SWaP broadband infrared camera architecture. Digital-pixel focal plane for real-time digital image processing enable the intelligent chips. This paper highlights sensors with nanostructure coupled FPA, photo trapping FPAs, high density FPAs and digital-pixel FPAs.
Begin with the most pressing general questions base on the major surveys of astronomy and astrophysics today, the paper introduce the mission of deep space infrared detection, and the main requirements for infrared detectors, then introduce the principles and performance of cutting edge infrared detectors, readout integrated circuit and Application Specific integrated Circuit (ASIC) for deep space observatory. Base on present state of the infrared detectors, propose advices for developing Chinese infrared Focal Plane Array (FPA) detector for deep space observatory.
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