| At present, CCD (Charged-coupled device) is one of the most widely used electro-optical imaging devices. Because of its excellent imaging performance, image acquisition system based on CCD is also widely applied in many fields such as military, aircraft, medicine, chemical industry. And high frame rate of the CCD camera has also become more and more popular on the market.This paper introduces the design of the semiconductor refrigerating high-speed CCD camera transferred by USB3.0interface, studies and designs the front of the camera such as CCD driver, data acquisition, data transfer, refrigeration and so on. It analyzes the basic principle of the CCD imaging, provides a method to suppress noise by semiconductor refrigeration. It also introduces the Sony CCD chip ICX285AQ in detail, analyzes the drive timing of ICX285AQ, designs ICX285AQ drive timing circuit selecting built-in analog front end (AFE), fully programmable timing generator (TG) and AD9995(6-phase vertical clock support) to driver CCD, complete the firmware programming using the C language. Firmware is programmed into the EEPROM chip, complete communication with the AD9995via SPI protocol.This paper analyzes the parameters of USB3.0. It finishes the firmware programming of USB3.0selecting the the Slave-FIFO mode.It studies the principles of semiconductor refrigeration and heat pipe radiator working principle on the basis of the above research, and selects the proper semiconductor refrigeration and heat pipe radiator to design a reasonable cooling structure of heat radiator, semiconductor refrigeration system is put into the camera so that when a high frame rate camera work for long integration time at room temperature, CCD sensor inside the camera is cooled to below room temperature of25degrees to reduce the fixed pattern dark current noise and transient random noise. Successful research camera test result shows that the design can guarantee chip temperature is lower than room temperature to25degrees in long working, so as to ensure the CCD work in the state of the low-noise, effectively eliminating the inherent thermal noise of the CCD, to ensure that the user in fluorescence the time integral of the state where the high SNR image. The article also shows the inadequacy and the need to further improve the work. |
