基于IEEE 1451.5的高精度智能称重传感器系统

High-Precision and Smart Weighing Sensor System Based on IEEE 1451.5

针对称重传感器系统智能化、高精度的需求,应用IEEE 1451技术和数字滤波算法实现高精度智能称重传感器系统。首先,根据IEEE 1451.5架构设计称重WTIM、NCAP及两者ZigBee通信接口,研究TEDS定义、配置技术以实现称重传感器ZigBee接口的即插即用、自识别功能;同时,提出一种适用于应变式称重传感器的数字滤波算法,在保证称重系统高分辨率的基础上提高称量精度;最后,搭建基于IEEE 1451.5的高精度智能称重传感器系统并研发称重测量软件,测试该系统的即插即用和精度性能。测试结果表明:该系统可实现智能称重传感器ZigBee接口即插即用;采用数字滤波算法的系统非线性误差不超过0.0058%F.S、迟滞误差不超过0.0037%F.S、重复性误差不超过0.0051%F.S,比采用数字滤波前分别减少32.56%、22.92%、17.74%,精度显著提高。

Contraposing the smart and high-precision demand of weighing sensor system, this paper designs and realizes high-precision and smart weighing sensor system using IEEE 1451 and digital filter algorithm. Firstly, weighing WTIM and NCAP is designed. TEDS definition and configuration technology is researched for ZigBee interface self-identification between WTIM and NCAP. Digital filter algorithm is presented for strain gauge load cell. The digital filter algorithm can improve precision and ensure high resolution of weighing sensor system. Finally, high-precision and smart weighing sensor system based on IEEE 1451.5 is constructed for its plug and play performance and precision performance test. The weighing test software is implemented. The test result shows that the system realize ZigBee interface plug and play. The precision of weighing system using the digital filter algorithm is high. The system＇s non-linear error en is lower than 0.0058%F.S. Its hysteresis error eh is lower than 0.0037% F.S. Its repeatability error er is lower than 0.0051%F.S. Comparing with the weighing sensor system not using digital filter algorithm, its en, eh and er reduce 32.56%, 22.92% and 17.74%.