Design And Realization Of The Cottonseeds Color Sorter' Detection System

Xinjiang Production and Construction Corps is main area which yields cotton in china. It also is a important generalization and demonstration area for the precision seeding technology. But, in current years, because cotton are influenced by some factors,for example, geographical condition, climatic conditions, cultivation and management conditions and natural disasters, plus cotton multiplication speeding up, unable to keep up with the land management. Although the cotton can be normally abloom, harvest, but the maturity of cottonseeds is obviously declined, especially the averagely proportion of the redseeds in post-harvest cottonseeds is 20 percent to 30 percent. It seriously affects the quality of the cottonseeds and germination rate declined significantly. Now, primary means of sorting redseeds is artificial selection. artificial selection has many unfavorable factors, such as labour-intensive, low productivity, high input costs, human factors and uneven selection quality. the greater cottonseeds processing plants have used the color sorter for sorting, and the effect is very good. For the entire color sorter, the detection system is one of the core systems, it has a direct impact on the accuracy of the color sorter. Baseing on this, the detection system has been designed in this paper, so as to lay the foundation for developing the entire color sorter.The paper first introduces the development of the color sorter at home and abroad, as well as analysed the color sorter'situation in Xinjiang. By comparing the advantages and disadvantages of the domestic and international color sorter'detection system ,as well as analysing current main detection technology,the paper put forward to set up the entire detection system by the use of digital signal processors DSP as the CPU and linear CCD sensors. In the paper, the second chapter comes to the conclusion that cottonseeds'quality and their color voltage signal has significant correlation by analysing the correlation about the germination trend and germination rate which are two important Indicators for reflecting cotton seeds'quality,and their voltage signal. It makes our system development have fully theoretical foundation.In the paper, the third chapter detailedly designs optical system which is detection system important subsystem. The paper put forward that light path of the optical system adopts Kela lighting system and far-haert light path matching with it, and set up the entire optical system. Finally, we mensurates the voltage signals of cottonseeds by using the optical system. The result shows that the clear voltage signals can be measured by using it. The third chapter introduces CCD'basal structure , principle and parameters, decides the type of linear CCD and introduces TCD1501D'parameters, compares the good and bad on CCD drive circuit. The paper designs the drive circuit basing on parameters of choosed linear CCD and designs circuit and emulates. Finally,The system get clear cotton seeds voltage signals by connecting CCD and optical system. Then, the paper detailedly introduced the DSP-based signal acquisition and processing system which is another part in the detection system. The paper introduces it,including selection of hardware, compatible with hardwares, some external circuit design, building the entire system and implementation of the software .Finally, the paper analyzes and researches the interfering factors which may lead to detection system can not long-term, stable and reliable operation aiming at processing environment, and the paper takes the corresponding anti-jamming measures to curb various interfering factors'influence under the processing environment to ensure the system long-term reliable operation.