【作者】 靳辉；

【导师】 孙英； 翁玲；

【作者基本信息】 河北工业大学 ， 电气工程， 2015， 硕士

【摘要】 随着材料科学的不断进步以及控制技术的快速发展,磁致伸缩液位传感器在工业测量中得到了广泛应用。检测信号是磁致伸缩液位传感器测量的关键,对传感器的测量精度有一定的影响。为此本文以Fe-Ga作为波导丝材料,根据磁致伸缩逆效应,从波导丝扭转强度及检测线圈两个方面进行分析,得出了影响磁致伸缩液位传感器检测信号的主要因素。本文搭建了实验平台,该实验平台主要由电源、脉冲驱动电路、波导丝、检测线圈、不锈钢套管、阻尼装置等部分组成。基于该实验平台进行了实验测试,研究了脉冲电压、浮子以及波导丝等因素对传感器检测信号的影响,为传感器硬件、软件设计提供数据参考。根据以上分析,对传感器对各部分进行了优化。电源部分采用了效率更高且符合安全要求的开关电源芯片LM2576,信号处理部分采用了差分放大比较的电路形式,控制部分选用性价比更高的ATmega16作为控制芯片,选择高精度时间测量芯片TDC-GP2作为计时芯片,选择DS18B20作为温度测量芯片和LCD1602作为显示部分,采用与硬件相结合的FIR软件滤波方法对信号进行处理。对优化的传感器进行了测试及标定,对标定结果进行了简单分析。本文为国内高性能磁致伸缩液位传感器的研制提供参考,为Fe-Ga材料磁致伸缩液位传感器的应用奠定实践基础。更多还原

【Abstract】 With the rapid development of material science and control technology,the magnetostrictive liquid level sensor has been widely used in industrial measurement.The detection signal is the key of the magnetostrictive liquid level sensor,and has an important effect on the measurement accuracy of the sensor.In this paper,Fe-Ga is used as a guide wire material in the magnetostrictive liquid level sensor.According to the magnetostrictive inverse effect,two aspects are analyzed which are the torsional strength of the waveguide wire and the detection coil.The main factors that influence the detection signal of the magnetostrictive liquid level sensor are obtained.Firstly,the experimental platform is built,which is mainly composed of the power supply,the pulse generating circuit,guide wire,the detection coil,stainless steel casing,damping device and so on.Based on the experimental platform,a series of experiments are performed to study the effects of pulsed voltage,float,the waveguide wire and other factors on the detection signal of the sensor.The research results provide data reference for the hardware and software design of the sensor.According to the above analysis,the sensor is optimized for each part.In the part of the power supply,the switching power supply chip LM2576 is adopted,which is more efficient and meets the safety requirements.In the part of the signal processing,the differential amplifier circuit form is used.In the part of the control,more cost-effective ATmega16 is selected as the control chip.High precision time measurement chip TDC-GP2 is chosen as a time chip.DS18B20 is used as a temperature measuring chip,and LCD1602 is used as the part of display.FIR software filtering method combined with hardware signal processing is used in the signal processing.Finally,the sensor is tested and calibrated,and the calibration results are analyzed.The research results provide a reference for the development of high performance magnetostrictive liquid level sensor in China,which lays a practical basis for the application of magnetostrictive liquid level sensor of Fe-Ga.更多还原