| The electrically controlled infrared liquid-crystal microlens arrays(ECILMA)have already attracted the attention of domestic and foreign researchers,because of their small size and flexible zooming without any alteration of lens structures,and thus presented broad application prospects in several fields such as optical imaging,biomedical imaging,national defense and military.At present,a kind of unitary power-on driving and adjusting of the ECILMA is adopted commonly.For realizing addressable power-on control of any liquidcrystal microlens block or even a single microlens,so as to not only effectively improve the ability of obtaining multi-dimensional and multi-mode image information,but also achieve a more precise spatial lightbeam transformation,the action of developing a kind of multichannel driving and controlling signal generator has become a prerequisite for precisely manipulating lightbeams by the ECILMA.Although the purpose of effectively performing a parallel multi-channel driving and controlling of the ECILMA can be roughly achieved by expanding the current driving and controlling set-up,there exists several problems such as being relatively bulky and complex adjusting,having a large number of signal wire,and being difficult to couple or even integrate with the ECILMA.In this dissertation,a multichannel electrically driving and controlling scheme for the ECILMA based on carefully analyzing its structural characteristics and driving mechanism,is proposed and further applied to test and evaluate the principled multimode imaging operations.The main contents are as follows:A multi-channel electrically driving and controlling scheme for the ECILMA based on its unitary driving and controlling characters is proposed,and then a 32-channel signal for generating a 512-channel independent output signal achieved.An addressable multi-channel electronic switch array with low on-resistance and a working voltage range of 0～20 Vrms is designed and fabricated by using typical MOSFETs,triodes and multi-channel analog switches.Through synchronizing the output voltage signals outfrom the DAC into the storage capacitors,several operations including the loading,adjusting,maintaining,refreshing of the driving and controlling signal voltage over the ECILMA can be completed effectively,and the feasibility of the driving and controlling architecture is also verified by simulations.Based on the simulated verification of the multi-channel electrically driving and controlling architecture of the ECILMA,the design and production of the hardware circuits are realized by adopting optimization methods including key digital-analog separation and high-speed routing.The driving and controlling set-up already presents a large-scale data read and write capability by expanding the external SRAM.Through testing and evaluating the output voltage signal of the set-up fabricated,the experimental results show that a AC square wave signal with a RMS amplitude of 20 V at 1 k Hz frequency can be effectively generated,so as to satisfy the driving and controlling requirements of several liquid-crystal based multi-mode coupled imaging approaches.Based on completing the measurement and parameter calibration of the multi-channel driving and controlling set-up,and further coupled with the infrared polarized lightfield imaging system and the infrared spectral and the polarized imaging system through using flexible cables,the power-on driving and controlling of the imaging system above is implemented.The measurement results show that the typical infrared polarized lightfield images can be obtained by effectively driving and controlling the infrared polarized lightfield imaging system.The typical infrared polarized spectral imaging effect with significant light and dark pattern variance can be observed.The featured signal voltage indexes for different coupled imaging mode are successfully determined by performing different multi-mode coupled imaging test such as infrared lightfield imaging and polarized spectral imaging. |
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