Abstract
In order to solve the problem of low signal-to-noise ratio (about 15 dB) in magnetic signal acquisition of banknotes, a new method of magnetic signal acquisition and processing is proposed taking RMB as an example. In this method, weak signal detection is performed to reduce the noise accompanied with the signal. Seven orders of Chebyshev (I) filter and the anti-jamming technology are used in the PCB layout, and grounding modes are introduced to reduce the noise of the amplitude waveform. The proposed method reduce the final output noise by 2/3 and the signal-to-noise ratio is increased to 24 dB. The experimental results show that the magnetic signal of RMB banknotes are acquired by the circuit stability, which provides an important guarantee for the improvements of the anti-counterfeit and discrimination for banknotes performance.
Similar content being viewed by others
References
Tang C H. Techniques of discriminating machine for RMB banknotes [J]. Instrumentation Technology, 2005, 4: 80–81 (Ch).
Zhou L G, Liang T, Gao L C. Weak signal detecting and processing of pyroelectric infrared sensor [J]. Instrument Technique and Sensor, 2014, 12: 5–6(Ch).
Zou R, Chen X G, Bian J D, et al. Design of bill acceptor oriented to metro automatic fare collection application [J]. Computer Engineering, 2015, 41(6): 6–11(Ch).
Xue L Y, Li X. Algorithm of serial number extraction and recognition based on tunnel magneto resistance sensor [J]. Journal of Hangzhou Dianzi University (Natural Sciences), 2015, 3: 73–76(Ch).
Rong Y. Exploration on a step further localization of urban mass transit AFC system [J]. Urban Mass Transit, 2013, 9: 14–17(Ch).
Lu Y Q, Shi Z Q, Hu Y X, et al. The analysis of signal characteristics in counterfeit identification system based on multi-sensor [J]. Journal of Hebei University of Technology, 2015, 2: 43–49(Ch).
Gao J Z. Detection of Weak Signals [M. Beijing: Tsinghua University Press, 2011(Ch).
Li M. The Design and Implementation of Data Acquisition and Control System in Note Validator [D]. Guangzhou: South China University of Technology, 2014(Ch).
Vishnevskii V G, Berzhansky V N, Nedviga A S, et al. Visualizer of magnetic protection of securities and banknotes [J]. Sensor Letters, 2009, 7: 282–285.
Hu H B, Zhong H, Chen C L, et al. Magnetically responsive photonic watermarks on banknotes [J]. Journal of Materials Chemistry C, 2014, 2: 3695–3702.
Christopher F, Antao C. Induction detection of concealed bulk banknotes [J]. Measurement Science & Technology, 2011, 8357: 83570E.
Jiang N. Development of RMB Banknotes Counting Machine Security System [D]. Shenyang: Shenyang University of Technology, 2014(Ch).
Cao Y B. Magnetic Code—A New Method of Discrimination and Anti-counterfeit [D]. Shanghai: Shanghai University, 2007(Ch).
The People’s Bank of China. Financial Industry Standard of the People’s Republic of China (JR/T0002-94) [S]. Beijing: Standards Press of China, 1994(Ch).
Author information
Authors and Affiliations
Corresponding author
Additional information
Foundation item: Supported by the project of image recognition and control system in class A machine (HT201403)
Biography: WANG Yang, male, Master candidate, research direction: application of electronic circuits and development of field programmable gate array (FPGA).
Rights and permissions
About this article
Cite this article
Wang, Y., Zhang, Q., Chen, X. et al. Realization of magnetic signal acquisition scheme for banknotes. Wuhan Univ. J. Nat. Sci. 21, 344–350 (2016). https://doi.org/10.1007/s11859-016-1180-7
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11859-016-1180-7