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夜间可以采用两种不同的技术进行被动式观察,即微光像增强技术和热成像技术。微光像增强技术已经以第三代管子告终,因此,在本文中对该项技术不再深入讨论。目前这种技术正在得到应用,并且在今后一段时间内仍会得到应用,用于作用距离在几百米以内、仪器重量不超过一公斤的场合。例如步枪用瞄准具和直升机飞行员用的微光夜视眼镜。热成像技术则用于作用距离比较大的,并且它具有较大的发展潜力。
Passive observation can be performed in two different techniques at night, namely, low light intensification and thermal imaging. LLL enhancement technology has ended up as a third-generation tube, so the technology is no longer discussed in depth in this article. At present, this technology is being applied and will still be used for a period of time in the future. It will be used in applications where the operating distance is within a few hundred meters and the weight of the instrument is less than one kilogram. Such as rifle sights and helicopter pilots used glimmer night vision glasses. Thermal imaging technology is used for a relatively large distance, and it has great potential for development.