声磁防盗系统的识别原理及应用

The Identification Principle and Application of the Acoustic Magnetic Surveillance System

介绍电子商品防盗系统(EAS)的特点,阐述声磁防盗系统的特性和组成。根据磁致伸缩效应的可逆性,结合铁镍合金的磁致伸缩和磁机械耦合系数,围绕产生共振的三要素:材料、结构和磁场,解析声磁系统的识别原理。指出声磁标签的共振信号是一种声磁复合信号,以及谐振曲线是卓越性能的基础。

The paper introduces the characteristic of electronic article surveillance system, and elaborates the features and composition of the acoustic magnetic surveillance system. The identification principle of the acoustic magnetic system is analyzed including the reversibility, the magnetostriction and magneto - mechanical coupling coefficient of iron nickel alloy, and the three important factors of the occurrent resonating, material, structure and magnetic field. The conclusion is drawn that the resonate signal is a acoustic magnetic complex signal, and the resonance curve is the basis of good performance.