The Research Of Online Moisture Test Of Wheat For The Yield Measurement System

The research is one technology of precision agriculture , precision agriculture is a new strategy of agriculture, it is the result of information technology and artificial intelligence high technology applying in macroscopically area, especially in microcosmic area. It's whole conception base on dealing with cropland" spatial differentia" data collection and processing, how to measure actual conditions of growing and epidemic disease of crop individual, small colony crop, and the crop in square meter area, and then decide the best devotion according to the different conditions. The combine equipment with yield measurement system and GPS Orientation system is an important circle of precision agriculture. The yield data from combine directly reflect good and bad of production decision. Afford scientific basis for next decision. In order to finish the task, combine must equip with Global Position System (GPS) and crop yield measure system. As a important factor, crop yield measure system should have very high measurement level, measurement of cutting width, cutter height , conveyer rotate speed, wheat flux, Wheat moisture and combine run velocity are the important link. At present, the measurement method of wheat moisture have direct me(?)ment method and indirect measurement method. The principle of measurement have resistance method , capacitance method , microwave method , neutron method , weigh method and so on. Now, by that measurement method, the precision is relatively high for Static measurement, Suitable for the measurement in the laboratory. It is relatively less to study on real-time wheat moisture measurement. So, in order to meet the combine 's demand for crop yield measure system, the text will put emphasis on study measure wheat moisture by capacitance method. Profoundly describing how to realize online measure wheat moisture by capacitance method and the principle of the hardware and the software of the whole system. Afford a thinking method for online wheat moisture measurement.In the paper, detailed expatiate the principle of using capacitance method to measure wheat moisture, capacitance sensor's making and optimizing , the different moisture content wheat's preparation , data collection scheme design and implement, finally point out the relation among moisture content , temperature , difference frequency and tight solidity by analyzing every factor which influence the wheat moisture content, finish hardware and software design of the measure circuit, include program design of monolithic computer and PC and data process program, point out the main source of the measure error and analyze the reason ,at the same time ,do repeated inspection of measure result.