Simple Ultrasonic Measurement of Concentration in Solutions with Temperature Compensation by a Phase Difference Method
Simple Ultrasonic Measurement of Concentration in Solutions with Temperature Compensation by a Phase Difference Method
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通过相位差法进行温度补偿的溶液浓度的简单超声波测量
DOI：
10.1143/jjap.40.3566
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发表时间：
2001
影响因子：
1.5
通讯作者：
K. Ikeda
中科院分区：
文献类型：
--
作者：
K. Ikeda
本文提出了一种用温度补偿的相位差法测量溶液浓度的简单超声技术。这种技术依赖于由于溶液浓度变化而引起的声速变化。通过对不同声速测量值的最小二乘法分析，得到了糖溶液和NaCl溶液在浓度范围为0.0 ~ 20.0%、温度范围为15 ~ 45℃时的声速经验方程。很明显，就方程中对温度的依赖性而言，这两种解都可以使用相似的温度补偿因子。利用经验方程设计了温度补偿电路。具有温度补偿的测量系统显示出0.01%的浓度测定精度，与温度变化无关，糖溶液在25.2°C左右±0.9°C， NaCl溶液在25.4°C左右±1.0°C。
In this paper, we propose a new simple ultrasonic technique for measuring the concentration of solutions by a phase difference method with temperature compensation. This technique relies on sound velocity changes due to variations in solution concentration. An empirical equation of the sound velocity for both the sugar and NaCl solutions, which covered a concentration range of 0.0–20.0% and a temperature range of 15–45°C, was obtained by analyzing the measurements of various sound velocities through the least squares method. It became evident that a similar temperature-compensation factor can be used for both the solutions in terms of dependence on temperature in their equations. An empirical equation was applied to design a temperature compensation circuit. The measuring system with temperature compensation was shown to yield a 0.01% accuracy of concentration determination, independent of the temperature variation of ±0.9°C around 25.2°C for the sugar solution and of ±1.0°C around 25.4°C for the NaCl solution.