Application Study On ECT Technology In Barn-moistrue Measurement

Agriculture is the foundation of a country. Only steady agriculture makes a balanced country. Provisions problem is a vital subject that concerns a country's future and all people's life. To solve this problem, we can enlarge arable land or develop the output of unit area; besides, the safety of provisions storage comes to a significant position.However, too many factors impact the problem, thus conventional means can not give an online check of the moisture of a barn quickly.Electrical Capacitance Tomography (ECT) is a new tomography that first applied in the mid of 80s and get developed from then on. The technology has many advantages, such as non-encroachment, non-eradiation, quick response, real-time online, plain structure, low cost, and wide application, and so forth. This thesis writes on the study of the application of visible checking of ECT technology in a barn, stressing the study of the checking technology of micro-capacitance command. It mainly is about the following tasks:(1)Thoroughly analysed the application field, basic theory, system structure, and basic characteristics of ECT system, and expounded the advantages and disadvantages of ECT technology, and illustrated its present application and future development.(2)Analysed the basic theory of micro-capacitance gauging circuit, the characteristics of circuit, and the problems now exist. Have the direct current charage-discharage C/V convert circuit and the alternating current energizing C/V convert circuit compared. And finally I fixed corresponding capacitance checking projects for laboratory's basic study.(3)Since analysed the theory of micro-capacitance gauging circuit and previous circuit, I devised a kind of alternating current energizing C/V convert circuit which was preeminent performance and low priced, and gave out the performance index/parameter of the circuit.(4)I broke previous researchers' routine, and excogitated a high frequency and high voltage pumping source. Thanks to this device, the checking sensitivity was improved.