Due to LWIR FPAs is sensitive to ambient temperature, A new coarse and fine compound temperature measure and control method is presented for mK-level measure and control accuracy target of 12.5 um IR FPAs. Coarse measurement and control method is used in non-imaging period, and fine measurement and control method with low-drift precision temperature measurement circuit is used to achieve mK-level measure and control accuracy. Temperature drift model of precision temperature measurement circuit is established, and temperature drift contrast is done between traditional temperature measurement circuit and precision temperature measurement circuit. Experiment results show that the measurement precision of compound temperature measure and control method reaches 3mK and control precision reaches 8mK.
Infrared imaging generally refers to the technology that takes radiation energy of the target itself as received signal and converts it into an image. We can obtain geometric characteristics as well as temperature characteristics of the target day and night by applying the infrared imaging technology as it can hardly be affected by illumination conditions and adverse weather, hence it is extremely important for both military and civil use. Since the combination of infrared and visible light imaging enables us to achieve the target information more comprehensively, the remote sensing cameras rapidly accomplished the transition from single pass to multipass, which allows them to obtain visible light and infrared images through different optical paths simultaneously. However, this imaging system greatly increased the volume, mass, power consumption and cost budgets. Here, we discussed an innovative graphene/QDs photodetector for remote sensing. As the bandgap of QDs is controllable through its size-dependence, its response spectrum could easily be modulated through the size control and ligand exchange1, thus enables us to obtain a detector with response spectrum range from visible light to medium wave. And with the help of PMMA-assisted transfer processing2, we can arrange the QDs with different response spectrum on purpose. Therefore, it is possible for us to customize the response spectrum for each pixel, and this truly enables the visible infrared integrated single pass imaging system and could generate a variety of strategies for remote sensing.
Curved detectors have attracted more and more attentions and gradually become a focus research area due to the widespread applications of the optical imaging technology in the past few years. Unlike the traditional planar detectors, curved detectors have focal planes that can be bent into the same shape as the image surface of the optical system theoretically. As a consequence, the field curvature is directly suppressed as we don’t need to flatten the focal surface to fit a plane detector, leading to a simplified optical system and a better performance, especially suitable for optical imaging systems in space applications. However, due to the intrinsically planar nature of the established fabrication technology, it is extremely difficult to achieve these innovative detectors. In this paper, we summarized the latest works about curved detectors and proposed a novel type based on graphene/QDs. The device consists of a graphene/QDs film interconnected with a conventional readout circuit via a curved SiO2 substrate. A critical important design feature is the Au lines within the high depth-diameter ratio holes of the substrate, through which the graphene pixels are connected to the readout circuit. Compared to the published methods, the fabrication process of this detector is simplified, and the cost budget is reduced as well. More importantly, this detector can achieve a superior performance thanks to the prominent properties of graphene/QDs. We believe that our new device concept will stimulate the flow of ideas and contribute to the mature applications in the future.
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