Study On Ultraviolet Imaging Spectrometer Based On Gigabit Ethernet

Imaging spectrometer is one of the most important research areas of currentremote sensing technology. It has the ability to require continuous spectral image data.The high spectrum resolution has the advantage of characteristics analysis oftopographical objects and improves the quantitative level of remote sensing.Ultraviolet detection is another important optoelectronic technology after visible andinfrared technology. According to the characteristics requirement of differentwavelength of ultraviolet radiation, ultraviolet detection has been applied in manyareas including atmosphere environment monitoring, ozone monitoring, oil spillmonitoring, lightning disaster weather report and so on. It has also been extended toother industrial manufacture application such as corona detection.The research of this dissertation is focused on the design of a miniaturizedpush-broom ultraviolet imaging spectrometer. Based on study of current developmentof ultraviolet remote sensing domestic and abroad, an implementation scheme whichconsists of ultraviolet lens, ion-etched and holographic ultraviolet gratings andUV-enhanced back-thinned CCD with high sensitivity is promoted. Considering fullframe upload of area image sensor, Gigabit Ethernet based on FPGA is implementedto meet the high-speed rate and long distance of data transmission. The principleprototype, including mechanical assembly, optical assembly and calibration, electricalsoftware and hardware system, is constructed. The performance and experimentalresults of the principle prototype is measured and analyzed. Finally, the problemsduring the research work are summarized and analyzed for future research.The ultraviolet imaging spectrograph wavelength range290nm~408nm isrealized. It could be configured to work at two modes: full spectrum mode andmulti-channel mode, which the channel bandwidth could be configured depending onthe application. Gigabit Ethernet transmission bus is implemented to realize thehigh-speed large-capacity data transmission for future research work. The highlight ofthis dissertation could be summarized as follows:1) Based on the analysis of ultraviolet remote sensing requirement, an ultravioletimaging spectrometer implementation scheme which consists of ultraviolet gratingcomponent, UV-enhanced back-thinned CCD with high sensitivity and Gigabit Ethernet is promoted. After sensitivity analysis of the system and experiment system,the feasibility of the scheme is verified to achieve ultraviolet spectral detection.2) After characteristics analysis of UV-enhanced back-thinned CCD with highsensitivity, detection noise suppression technology, programmable on-chip technologyand multiple frame transfer technology combined with ultraviolet grating are used totestify the feasibility of the scheme furthermore. The main performance parametersare listed below: seven detection waveband range from209nm to408nm, spectralbandwidth8nm~30nm, spectral resolution0.24nm, sensitivity above400under asolar constant (when angular resolution is0.18mard and integration time is12.7ms),MTF above0.2in ultraviolet channel.3) By use of hardware and software technology of Gigabit Ethernet based onFPGA, the system data transmission of speed above200Mbps and long-distanceabove15meters could be achieved. The interface bus is easy to handle and suitablefor upload of large numbers of data during spectral measurement and push-broomimaging. It could serve as a good solution for on-site data acquisition of ultravioletimaging spectrometer.