Data Acquisition System of Linear Array CCD based on ARM

摘要

Linear array CCD device has the characteristics of large pixel size, high precision, good resolution, wide spectral response, small volume and so on. It is widely used in image sensing, spectral analysis and non-contact measurement fields such as size, displacement and vibration measurement.In this paper, the general structure and timing control characteristics of linear CCD are analyzed, and the typical CCD chip Toshiba TCD1304 is studied. The CCD is a linear image sensor with high sensitivity and low dark current. The pixel size is 8um × 200um, 3648 pixels in total, and the wavelength response range is 300nm ~ 1100nm.Secondly, the 32-bit flash microcontroller STM32F103 based on the core of arm cortex m3 processor is used as the main control chip, and a set of CCD data acquisition system with flexible integration time adjustment function is designed by combining with the 12 bit high speed A/D converter, 2.8-inch TFT LCD and upper computer software.Finally, the whole system is tested, The test results of the system verify the feasibility of the driving timing design of linear array CCD. The driving timing signal is connected to the CCD device. Under the condition of different light incidence, the CCD works normally and outputs the corresponding video signal driven by the driving signal. The technical indexes of the system can meet the requirements of the system design, and provide a technical reference for similar CCD data acquisition system and lay the foundation for further image recognition and processing.