深圳大学学报理工版

采用基于电容式的传感技术,通过检测寄生电容容量的变化,实现准确检测盐水质量分数.将长条形金属薄片插入盐水中,当盐水质量分数发生变化时,金属薄片上的寄生电容会发生相应的变化.数字式的高精度电容感测传感器能够感知这种微弱变化,并将其转换为28 bit的二进制数数字量输出,再通过集成电路总线(inter-integrated circuit, IIC)接口传输到高性能微处理器STM32H743IIT6进行采集和处理.用桥式压力传感器制作的电子秤测量盐水质量,用串口超声波测距模块测量盐水液位高度.采用多传感器数据融合方法,计算得到准确的盐水质量分数.实验结果表明,该方法检测盐水分数的精度可达0.1%.

In order to accurately detect the mass fraction of brine, we design a new type of brine mass fraction measuring instrument. In this instrument, the capacitive sensing technology is adopted to detect the change of parasitic capacitance on the metal sheet. The digital high-precision capacitance sensor can sense this weak change and convert it to 28 bits binary digital output. The data is transmitted to the high performance microprocessor STM32H743IIT6 through the interface of integrated circuit(IIC)for acquisition and processing. The quality of brine is measured by the electronic scale made of bridge pressure sensor, and the height of brine level is measured by the serial port ultrasonic ranging module. The accurate brine mass fraction is calculated by using the multi-sensor data fusion method. The experimental results show that the method can detect the brine mass fraction with an accuracy of 0 1%.

引言
1 系统设计
2 硬件设计
3 软件设计
4 测试及结果分析
5 结语

$图1 盐水质量分数检测系统设计框图 Fig.1 Design diagram of brine mass fraction detection system$

图1 盐水质量分数检测系统设计框图
Fig.1 Design diagram of brine mass fraction detection system

表1 不同介质的相对介电常数<br/>Table 1 Table of relative dielectric constant ε values

表1 不同介质的相对介电常数
Table 1 Table of relative dielectric constant ε values

图2 FDC2214通道0等效电路<br/>Fig.2 Equivalent circuit of channel 0 in FDC2214

图2 FDC2214通道0等效电路
Fig.2 Equivalent circuit of channel 0 in FDC2214

$图3 盐水质量分数电容感测原理图 Fig.3 Schematic diagram of capacitance sensing of brine mass fraction$

图3 盐水质量分数电容感测原理图
Fig.3 Schematic diagram of capacitance sensing of brine mass fraction

图4 桥式压力传感器电路图<br/>Fig.4 Circuit diagram of bridge pressure sensor

图4 桥式压力传感器电路图
Fig.4 Circuit diagram of bridge pressure sensor

图5 串口超声波模块<br/>Fig.5 Serial port ultrasonic module

图5 串口超声波模块
Fig.5 Serial port ultrasonic module

$图6 盐水质量分数测量系统软件流程图 Fig.6 Software flow chart of brine mass fraction measurement system$

图6 盐水质量分数测量系统软件流程图
Fig.6 Software flow chart of brine mass fraction measurement system

$图7 盐水质量分数电容感测量系统样品 Fig.7 Sample of brine mass fraction capacitance sensing measurement system$

图7 盐水质量分数电容感测量系统样品
Fig.7 Sample of brine mass fraction capacitance sensing measurement system

表2 盐水质量分数电容感测实验结果<br/>Table 2 Experimental results of capacitance sensing of brine mass concentration

表2 盐水质量分数电容感测实验结果
Table 2 Experimental results of capacitance sensing of brine mass concentration

$图8 盐水质量分数和电容感测值之间拟合曲线图 Fig.8 Fitting curve between brine mass fraction and capacitance sensing value$

图8 盐水质量分数和电容感测值之间拟合曲线图
Fig.8 Fitting curve between brine mass fraction and capacitance sensing value

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备注

引言

1 系统设计

2 硬件设计

3 软件设计

4 测试及结果分析

5 结语

期刊信息

备注