摘要
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 01%.
作者
黄健
HUANG Jian(School of Information Engineering,Xijing University,Xi an 710123,Shaanxi Province,P.R.China)
出处
《深圳大学学报（理工版）》
EI
CAS
CSCD
北大核心
2021年第1期92-97,共6页
Journal of Shenzhen University(Science and Engineering)
基金
陕西省科学计划资助项目(2016GY141)。
关键词
电子技术
电子电路
仪器仪表技术
传感器技术
盐水质量分数测量
电容感测
桥式压力传感器
超声波测距
electronic technology
electronic circuit
instrument technology
sensor technology
brine mass fraction measurement
capacitance sensing
bridge pressure sensor
ultrasonic ranging
