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公开(公告)号：US11412139B2
公开(公告)日：2022-08-09
申请号：US16954196
申请日：2019-01-09
发明人： Dachuang Li , Dongcai Liu , Shan Jiang
摘要： The present application discloses a traffic monitoring device capable of switching camera modes, comprising a sensor group, a infrared camera group, a visible light camera group, a visible light camera head, a infrared camera head, a head driver and a digital signal processor. The sensor group comprises pressure sensor, photoelectric displacement sensor and photosensitive sensor; the infrared camera and the visible light camera collect image information. The above devices are used as the detection front ends connected to the digital signal processor. The head driver adjusts the angle of the visible light camera and the infrared camera in real time. The system described in this application has two working modes: continuous shooting and interval shooting, which shortens the working time of the system, extends the life of the system, and reduces the cost of the system. The shooting camera can be switched according to the light intensity, to avoid the dazzling effect of supplementary visible light on human eyes, and to reduce hidden dangers to traffic safety. The camera angle can be fine-tuned with no dead angle shooting. License plate recognition and illegal shooting can be performed at all weather.
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公开(公告)号：US11894159B2
公开(公告)日：2024-02-06
申请号：US16966014
申请日：2020-06-30
发明人： Dachuang Li , Mingxin Dong , Kai Wang , Wei Song , Dongsheng Ding , Baosen Shi
摘要： A proportion adjustable single-photon beam splitter based on cold atom storage includes a two-dimensional magneto-optical trap for receiving a first optical signal to be split; and a coupling beam. The coupling beam is incident at a certain angle with the first optical signal to the two-dimensional magneto-optical trap. The storage time of the two-dimensional magneto-optical trap 1 can be adjusted by controlling the switching time of the coupling beam, and then adjusting a proportion of a photon number of a storage part and a photon number of a leakage part of the first optical signal. A splitting proportion may also be adjusted by controlling an optical depth of the alkali metal atomic group trapped in the two-dimensional magneto-optical trap.
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