基于51单片机测量液体浓度设计(论文)代码加仿真.doc

基于51单片机的液体浓度测量装置 毕业设计（论文）  摘要 随着现代科学技术的发展，对于液体溶液浓度的测量精度提出了越来越高的要求。在化工，医药，粮油酿酒等部门，有大量液态的溶液，中间产物以及最后成品，为了提高产品质量，降低成本和降低劳动强度，防止灾难性事故的发生就要求对这些溶液的成份进行实时，准确的分析并将所得的信息实时地进行反馈，以便及时调整生产流程达到最佳状态。液体浓度的实时在线测量在工业生产中具有重要的意义，由于直接使用化学方法测量一般需要人工较长的时间，难以满足实时地控制生产的需要，因此通常用间接测量方法，即通过测量溶液的某些参数，然后根据这些参数和浓度的关系来推算溶液的浓度。根据测量参数的种类将液体浓度测量方法划分为测量电学性能的电导法，电容法，电感法，测量光学性能的折射率法没，吸光率法，测量对射线的吸收能力的射线法，测量声学性能以及直接测量比重性能的容重法等等。 关键词：超声波传感器,超声波液体浓度计，便携式，声时，最小二乘法。  Abstract With the development of modern science and technology , for liquid concentration measurement accuracy of the increasingly high demands. In the chemical industry, medicine , grain wine and other sectors , a large number of liquid solutions , intermediates and final product , in order to improve product quality, reduce costs and reduce labor intensity and prevent catastrophic accidents on the requirements of the composition of these solutions in real-time , accurate analysis of the resulting information in real-time feedback , in order to adjust the production process to achieve the best condition. Real-time online measurement of the concentration of the liquid has important significance in the industrial production , due to the direct use of artificial chemical methods generally require a longer measurement time , it is difficult to meet the needs of real-time control of production , it is often measured by the indirect method in which the solution was measured by Some parameters , and then according to the relationship of these parameters to calculate the concentration of the solution concentration . Depending on the type of measurement parameters of the liquid into the concentration measuring method of measuring the electrical properties of conductivity method , the capacitance method, the inductance method, method of measuring the refractive index of the optical properties is not , absorbance method , measurement of the radiation absorption capac