A Magnetic Field Imaging System Based on TMR Sensors for Banknote Recognition. - Liqian Wang; Jingen Wu; Jiaming Liu; Ruohao Mao; Mengmeng Guan; Dan Xian; Qi Mao; Chenying Wang; Zhiguang Wang; Zhuangde Jiang; Zhongqiang Hu; Ming Liu (IEEE Trans. Instrum. Meas., 2022)