Design Research Of CameraLink Interface Camera For Adaptive Optics Systems

Currently, the adaptive optics(AO) system has been widely applied in astronomy andlaser beam cleanup, where detector is an important part of AO system acquiring wavefrontinformation.At the present time. detector usually uses CCD (Charge Coupled Device) orCMOS (Complementary Metal-Oxide-Semiconductor) camera. Adaptive optics systemusually require high speed camera in order to fullfill control bandwidth requirement. Withthe prosperity of high-speed camera market, industrial cameras have been widely used inadaptive optics systems. Industrial camera is good at easy operation, stableworking.However as industrial cameras are designed for universal applications and theirhardware are not open to end users,when applied in AO systems some problems arise, suchas low real-time performance, lack of flexibility and function developability. We proposed adesign method for resolving low real-time performence, lack of flexibility and functiondevelopment problems which industrial camera bringing to AO system. The design methodbased on industrial image sensor and CameraLink interface widely used in industrialcameras. We can also master the core technology of camera design for AO system bycamera designing research.In this dissertation, the core technologies for the designing camera used in AO systemwas analyzed, the architecture of camera design was proposed, selection devices referencingdevelopment of digital electronic systems was completed, such as image sensor, logicdevice, storage and data interface device, circuit and PCB(Print Circuit Board) design wascompleted, FPGA logic design with modularization method was completed, SignalTapIIensuring the normal functioning of each module was used. Finally, the performance of thecamera was analyzed. About real-time performance, results show that6Gbits/s read-out ratecan be reached at80bits mode with8tap/10bits data format.5200FPS can also be realizeswith a264x256pixels window. About flexibility, this camera is compatible with otherCameraLink modes, but also can implement custom data formats and flexible control ofimage sensors, such as target surface window and adjust the exposure mode. Aboutfunction developability, image cutting function with hardware is developed, and otherfunctions are also analyzed.Results show that the proposed design method could effectively meet the requirementsof CameraLink based cameras used in adaptive optics systems with improved real timeperformance, flexibility and function developability, which is helpful for integration and efficiency improving of the adaptive optics system.