Research On Information Acquisition And Processing Of The Staring Imaging System Based On UV-enhanced BT-CCD

As we all know, ultraviolet imaging technology can be used with a bright application prospect in various fields, which includes space exploring, oil spill detecting, criminal investigation, water quality monitoring and so on. In consideration of the difference of ultraviolet radiation reflectivity from the detecting target, we have to focus on diverse ultraviolet waveband in many different application fields. The traditional ultraviolet detecting system with a technology of push-broom has very short and limited integration time, which results that the SNR of system cannot be raised any higher. So the need for ultraviolet detecting cannot be satisfied. The research is to design build an staring imaging system with multiple channels in the foundation of UV-enhanced back-illuminated area array CCD, which will has certain reference significance for the development of ultraviolet detecting system.The dissertation implemented a staring imaging system based on the BT-CCD area image sensor with 684×500 pixels array. A stepper motor was used in the imaging system to rotate a filter wheel so that the imaging system can choose its working band by insert different sets of filters into the light path. Considering full frame upload of area image sensor, Gigabit Ethernet based on FPGA+PHY chip is implemented to meet the high-speed rate and long distance of data transmission. The dissertation implemented the design of the staring imaging system, measured and analyzed the performance and experimental results of the system, summarized the remaining problems and came up with the solutions in the future.The designed ultraviolet BT-CCD staring imaging system could be applied in both ultraviolet and visible light environments. You are allowed to get a real-time selection of wave bands through the upper computer. Furthermore, integral duration of the imaging system can be adjusted from 0.5 ms to 3 s. In terms of weak ultraviolet signals, preferable SNR also can be achieved.The highlight of this dissertation could be summarized as following:1 Completed a staring imaging system by the BT-CCD area image sensor. BT-CCD image sensor could achieve a higher SNR in ultraviolet wavelength for its greater quantum efficiency. The imaging system with an area image sensor could work in staring mode, which meant a longer integrated time and a higher SNR.2 implemented multiple channels design by using the stepper motor. The filter wheel had 4 channels. By moving different sets of filters into the light path, the system could work at different wave band. In consideration of the difference of ultraviolet radiation reflectivity from the detecting target, the multiple channels design made the system a bright application prospect;3 took faster Gigabit Ethernet as the interaction between the hardware and upper system. Compared with the traditional USB 2.0 interface, Gigabit Ethernet interface had faster transmission speed, and was much more suitable for high-speed CCD detector, besides, it could achieve much faster frame rate. The Gigabit Ethernet interface was linked up with four groups of UTP-5, and its maximum transmission distance could be 100 meters, which was further than the USB interface, whose was about 1 meter. And this feature effectively improved the flexibility of the imaging system for practical use.