HUANG Han, GAO Xiao-guang, HE Xiu-li, et al. Magnetic particle detection method based on giant magnetoresistance sensor[J]. 2018, (5): 23-26. DOI: 10.13873/j.1000-9787(2018)05-0023-04.
基于巨磁电阻传感器的磁珠检测方法
摘要
根据多层膜巨磁电阻(GMR)传感器检测速度快、灵敏度高、仪器易于小型化的特点
比较了不同磁场激励方式与输出信号处理方法
采用电桥电压与激励磁场双调制的检测方法
提高了传感器的信噪比
实现了微米磁珠的定量检测和纳米磁珠的定性检测。
Abstract
According to advantages of rapid detection
high sensitivity and easy to be miniaturized of giant magnetoresistance( GMR) sensor
and characteristics of multilayer GMR sensor
excitation mode of different magnetic field and method of output signal processing are compared. The signal to noise ratio( SNR) of sensor is enhanced by double-modulation detecting method of bridge and voltage and excitation magnetic field. This method achieves magnetic micron-particle quantitative detection and nanoparticle qualitative detection.