New space infrared system research achieving ultra-high radiation resolution

Li-min Wu; Liang Long; Song-lin Yu; Yuan Yuan; Yu-chen Liu

doi:10.1117/12.2543362

18 December 2019 New space infrared system research achieving ultra-high radiation resolution

Li-min Wu, Liang Long, Song-lin Yu, Yuan Yuan, Yu-chen Liu

Proceedings Volume 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation; 1134111 (2019) https://doi.org/10.1117/12.2543362
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

When a space infrared camera has a higher temperature sensitivity , the more tiny temperature information it can record in the imaging data. High sensitive infrared camera takes an important role in observation of urban and sea targets and so on. A new space infrared camera system is designed based on pixel-level digital accumulation technology. The new infrared camera based on this technology realize the analog-to-digital convert of detecting signals into single detector pixel, which can reduce the noise caused by readout of analog signal markedly. This infrared system processes input signal by little capacitor packet digital-counting method，the integral capacitor plays the part of “voltage-to-frequency conversion”, which vary far from the traditional detector. The signal quantization process realized by the capacitor packet digitalcounting, every single charge packet is small, a capacitor of several fF in new system has the equal effect of a capacitor of thousands pF in traditional system, that makes the new infrared system can break the limit of integral capacitor’s physical restriction. So the new camera has the ability of achieving 1mK(0.001K) temperature sensitivity by theory without saturation electrons restriction. This ultra-high temperature sensitivity infrared camera system will break the temperature sensitivity limits of all infrared cameras on hand, and improve infrared system’s ability of distinguishing the tiny temperature a lot. The prototype camera has been manufactured and it has a 5mK NETD (Noise Equivalent Temperature Difference), the engineering feasibility of this camera system is valid. The pixel-level digital accumulation infrared camera will be an important development direction of future high-sensitivity space infrared camera technique.

Citation Download Citation

Li-min Wu, Liang Long, Song-lin Yu, Yuan Yuan, and Yu-chen Liu "New space infrared system research achieving ultra-high radiation resolution", Proc. SPIE 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation, 1134111 (18 December 2019); https://doi.org/10.1117/12.2543362

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KEYWORDS

Cameras

Infrared cameras

Signal to noise ratio

Signal processing

Infrared radiation

Sensors

Infrared imaging

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