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土壤水分测试仪软件设计.doc


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土壤水分测试仪软件设计.doc
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土壤水分测试仪软件设计
摘要
随着工农业经济的迅速发展,水资源危机成为越来越严重的问题,而且已经影响到人们的生活质量,成为制约社会进步和经济发展的重要因素。节约用水、尤其是农业节水灌溉对于进一步提升水资源的可持续利用和我国可持续经济发展具有现实意义。农业节水灌溉需要快速测量土壤水分含量,因此,土壤水分含量检测具有十分重要的长远战略性意义。
目前土壤水分检测方法主要有许多种,其中电容法检测土壤水分含量的优点是显而易见的,如低成本、容易构建、动态范围宽等。所以,基于电容传感器的土壤水分测试方法在广大的农村推广应用是可行的。
电容土壤水分传感器是依据土壤中不同成分介电常数的巨大差异而实现的,因此可构建基于土壤介电特性的电容传感器来测量土壤水分含量。土壤水分含量的变化引起传感器电容的改变,当传感器电容确定之后,土壤水分含量也得到确定。根据土壤的介电特性,土壤电容传感器除了本身的有效电容外,还存在一定的介质损耗,相当于电阻损耗。为了获得电容土壤水分传感器的电容分量,通常的方法是减小损耗的影响,但是实际上这并不能从根本上消除固有的损耗。
关键词:土壤水分含量,土壤介电特性,附加电阻,高频电容
Soil moisture tester software design

Abstract
Along with the rapid economic development, agricultural water crisis e more and more serious problems, and affects people's quality of life, e the social progress and economic development is the important factor.Save water, especially for further promotion of water-saving irrigation agriculture sustainable utilization of water resources sustainable economic and social development in China and the practical significance.
Agricultural water saving irrigation needs rapid measuring soil water content of soil moisture content, therefore, has very important strategic significance to the long-term.
Current soil moisture detection methods are many species, including capacitance method to detect the advantages of soil water content is obvious, such as low cost, easy to construct, dynamic range wide, etc. Therefore, based on capacitive sensor test method of soil moisture in the vast rural application is feasible.
Capacitive moisture sensor is based on soil in ponents of dielectric constant and achieve the great differences, so you can build on the dielectric properties of soil sensor to measure the soil moisture content. The soil moisture content changes caused by change of capacitance sensor, when the sensor capacitor, soil moisture content after also determined. According to the characteristics of soil and soil capacitor dielectric sensors besides itself effective capacitance, still exist certain dielectric loss, the equival 内容来自淘豆网www.taodocs.com转载请标明出处.
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