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1.中国科学院微电子研究所 光电技术研发中心,北京 100094
2.中国科学院大学 微电子学院,北京 100049
Received:12 May 2022,
Revised:10 June 2022,
Published:25 December 2022
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朱强,周维虎,陈晓梅等.高速实时近红外弱信号检测系统[J].光学精密工程,2022,30(24):3116-3127.
ZHU Qiang,ZHOU Weihu,CHEN Xiaomei,et al.A high-speed and real-time SWIR weak signal detection system[J].Optics and Precision Engineering,2022,30(24):3116-3127.
朱强,周维虎,陈晓梅等.高速实时近红外弱信号检测系统[J].光学精密工程,2022,30(24):3116-3127. DOI: 10.37188/OPE.20223024.3116.
ZHU Qiang,ZHOU Weihu,CHEN Xiaomei,et al.A high-speed and real-time SWIR weak signal detection system[J].Optics and Precision Engineering,2022,30(24):3116-3127. DOI: 10.37188/OPE.20223024.3116.
为了实现对钞券表面涂层高速在线检测,研制了一种基于高速钞券质量检查机的实时近红外弱信号检测系统。首先,根据涂层材料的特性,采用近红外波段的发光二极管和光电二极管,研制了驱动和弱信号采集电路;然后,利用现场可编程门阵列和图形化虚拟仪器平台实现了数据的实时传输和处理;最后,提出了计算信号峰值强度的峰值标准差法并分析了该算法的实时性,进行了钞券表面涂层检测和算法实时模拟实验。实验结果表明,在钞券22 m/s的运行速度下,无论衬底是简单或复杂,未涂布钞券的信号均明显高于已涂布钞券的信号,分别差约为7 000,4 000,1 400,衬底图文越复杂,信号差越小。算法开始至结束的时间约为2~3 ms,远小于22 ms的钞券时间间隔,算法速度满足实时要求。本文研制的系统具有高速、实时、稳定的特点,可高效检测纸张表面的涂层有无,有望为涂层在线质量检测提供一种全新的方法。
To achieve high-speed online detection of banknote surface coatings, a high-speed and real-time design method for a near-infrared (NIR) weak signal detection system based on high-speed banknote quality inspection machines is proposed. First, according to the characteristics of coating materials, driving and weak signal acquisition circuits are developed by using NIR light-emitting diodes and photodiodes to achieve high-speed real-time weak signal detection. Second, the real-time data transmission and process are realized by using a field programmable gate array (FPGA) and a graphical virtual instrument platform. Finally, a peak standard deviation method for calculating the peak intensity of the signal is proposed, and the real-time performance of the algorithm is analyzed. The detection of the coating on the banknote surface and the real-time simulation experiment of the algorithm is carried out. The experimental results indicate that when the paper speed reaches 22 m/s, whether the substrate is simple or complex, the signal from the uncoated banknotes is significantly higher than that of the coated banknotes, and the differences are about 7000, 4000, and 1400, respectively. The more complex the substrate, the smaller the signal difference. The time from the beginning to the end of the algorithm is about 2-3 ms, which is far less than the time interval of 22 ms. The speed of the algorithm meets the real-time requirements. The system developed in this paper is high-speed, real-time, and stable; it can effectively detect whether the coating on the surface of the paper is available. It is expected to provide a new method for online quality detection of coatings.
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