Research on the high-precision non-contact optical detection technology for banknotes
Xiaofeng Jin, Tiancai Liang, Pengfeng Luo, Jianfeng Sun · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2015
The technology of high-precision laser interferometry was introduced for optical measurement of the banknotes in this paper. Taking advantage of laser short wavelength and high sensitivity, information of adhesive tape and cavity about the banknotes could be checked efficiently. Compared with current measurement devices, including mechanical wheel measurement device, Infrared measurement device, ultrasonic measurement device, the laser interferometry measurement has higher precision and reliability. This will improve the ability of banknotes feature information in financial electronic equipment.