压力式液位测量的设计模型研究
首发时间:2024-03-22
摘要:MEMS压力传感器应用到液位检测,建立新的压力式液位测量的设计模型,分析影响液位误差的因素和改善方法。通过理想气体状态方程建立压力式液位测量的全参数设计模型,能得到理论上误差为零的液位;建立管道长度设计模型,将液位误差当成可接受的测量误差,测量液位只需要两个测量数据,简化了测量和计算;建立误差模型,推导出各变量对误差造成影响的相关系数,量化影响程度。误差模型计算出传感器的最低安装位置,作为全参数设计模型和管道长度设计模型的结构设计补充。误差模型揭示液位误差与大气压、液位、管道长度正相关,与温度负相关。误差模型还表明管道长度越短,误差越小,设计液位检测装置时应尽可能选取短的管道长度。
关键词: 液位检测 设计模型 理论推导 密封气体长度 压力传感器 MEMS。
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Research on the design model of pressure type liquid level detection
Abstract:MEMS pressure sensors are applied to liquid level detection, establishing a new design model for pressure based liquid level measurement, analyzing the factors that affect liquid level errors and improving methods. Establishing a full parameter design model for pressure type liquid level measurement through the ideal gas state equation can obtain a theoretically zero error liquid level; Establish a pipeline length design model, treating liquid level error as an acceptable measurement error. Measuring liquid level only requires two measurement data, simplifying measurement and calculation; Establish an error model, derive the correlation coefficients of each variable\'s impact on the error, and quantify the degree of impact. The error model calculates the lowest installation position of the sensor as a structural design supplement to the full parameter design model and pipeline length design model. The error model reveals a positive correlation between liquid level error and atmospheric pressure, liquid level, and pipeline length, while a negative correlation with temperature. The error model also indicates that the shorter the pipeline length, the smaller the error. When designing a liquid level detection device, the shortest pipeline length should be selected as much as possible.
Keywords: liquid level detection Design model Theoretical derivation Sealing gas length Pressure sensor MEMS.
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