基于LabVIEW的相对介电常数测量系统
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摘要
为实现对绝缘材料相对介电常数的大范围、精确测量,设计了一套基于LabVIEW的相对介电常数闭环测量系统。该系统以电容传感器为基础,以C-V转换电路为核心,以LabVIEW程序和数据采集卡为控制模块,通过对测量电路输出信号的分析调整激励信号,激励信号调整到最佳状态后,通过采集的输出信号计算得到材料的相对介电常数。通过对部分绝缘材料介电常数的反复测量,进一步验证了此系统在材料相对介电常数测量上的稳定性和高精度。
In order to achieve a wide range and accurate measurement of the relative permittivity of insulating materials, a relative dielectric constant closed-loop measurement system based on LabVIEW is designed. The system is based on a capacitive sensor, with a C-V conversion circuit as the core, a LabVIEW program and a data acquisition board as the control module, and the excitation signal is adjusted by analyzing the output signal of the measurement circuit. After the excitation signal is adjusted to an optimal state, by the acquired output signal, the relative permittivity of the material could be calculated. Through repeated measurement of the dielectric constant of some insulating materials, the stability and high precision of the system's relative dielectric constant measurement were further verified.
In order to achieve a wide range and accurate measurement of the relative permittivity of insulating materials, a relative dielectric constant closed-loop measurement system based on LabVIEW is designed. The system is based on a capacitive sensor, with a C-V conversion circuit as the core, a LabVIEW program and a data acquisition board as the control module, and the excitation signal is adjusted by analyzing the output signal of the measurement circuit. After the excitation signal is adjusted to an optimal state, by the acquired output signal, the relative permittivity of the material could be calculated. Through repeated measurement of the dielectric constant of some insulating materials, the stability and high precision of the system's relative dielectric constant measurement were further verified.
引文
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[3] 吴俊军,刘四新,李彦鹏,等.跨孔雷达全波形反演成像方法的研究[J].地球物理学报,2014,57(5):1623-1635.
[4] 王秀丽,陈彦,贾明全,等.介电常数的实地测量装置的研制[J].电子测量技术,2010,33(9):4-7.
[5] 张云鹏,李恩,余承勇,等.圆柱腔复介电常数高温测试系统[J].电子测量与仪器仪表学报,2017,31(7):994-1001.
[6] 全国绝缘材料标准化技术委员会.测量电气绝缘材料在工频、音频、高频(包括米波波长在内)下电容率和介质损耗因数的推荐方法: GB /T 1409—2006[S].北京:中国标准出版社,2006.
[7] 龙爱群,刘立国,杨青,等.基于正切网络法测量低耗介质相对介电常数[J].实验室研究与探索,2011,30(2):82-84,113.
[8] 张乔根,游浩洋,秦逸帆,等.用于宽频带脉冲测量的平板电容传感器设计[J].高电压技术,2016,42(6):1708-1714.
[9] 丁舒忻.平行板电容器的等效计算分析[J].江西科学[J],2011,29(4):470-472.
[10] 袁聿海.“串并联”法在计算平行板电容器电容中的应用[J].湖南文理学院学报(自然科学版),2005,17(1):22-23,49.
[11] 夏凌云.基于TDC的一种微小电容高精度测量系统设计[J].仪表技术与传感器,2015(11): 101-104.
[12] 朱卫华,刘国稳,李月华.基于TM4C123G微处理器的宽量程全自动电容测量仪设计[J].国外电子测量技术,2015,34(7):84-88.
[13] 苏世熙,曾国强,喻明福,等.一种微小电容测量仪的设计与实现[J].自动化与仪表,2015(1):19-23.
[14] 王选择,张雨,赵治俊,等.一种高信噪比的高阻抗测量处理电路[J].仪表技术与传感器,2017(10):89-92,122.
[15] 赵秋明,许丰灵,肖龙.基于STM32的便携式阻抗测量装置的设计[J].仪表技术与传感器,2016(1):33-36.
[16] 李文强,黄刚,杨录.大量程全自动阻抗测量仪研究[J].仪器仪表学报,2014,35(4):859-865.